circuit breaker shunt trip coil function

Galvin Power is reader-supported. When you buy via our links, we may earn a commission at no cost to you. Learn more

What is a Shunt Trip Breaker and How Does It Work?

Written by  Edwin Jones  / Fact checked by  Andrew Wright

What is a shunt trip breaker? Does it add protection to your electrical system?

The shunt trip breaker is a combination of the shunt trip accessory and the main circuit breaker. This installs on the main breaker to add protection to your electrical system. This adds security to your electrical system as it manually or automatically cuts the electric supply in your circuit.

This accessory can help prevent short circuits and avoid electrical damage should a disaster occur in your home.

Let me tell you more about the shunt trip breaker to help you decide if you need additional protection for your electrical system.

Table of Contents

What is Shunt Trip Breaker and How Does It Work

Where are shunt trip breakers most used, how to install a shunt trip accessory to the breaker.

You should know that shunt trip breakers are different from GFCI circuit breakers.

The GFCI circuit breaker contains one big white tail wire for neutral connections only. It cannot be connected to any control package because the GFCI circuit breaker is solely designed to detect a sudden electrical surge. It has no other purpose but to cut power in case of a short.

Meanwhile, the shunt trip breaker wiring comprises two wires. One connected to the ground, and another to a control system. The control system can be connected to a sensor or to a manual switch. When activated, the shunt trip accessory will cause the main breaker to trip.

For example, if you install a shunt trip with a smoke detector, it will activate and cut off the power should the smoke sensor trigger. It can also be installed with a remote switch , allowing you to trip your breaker manually.

It is crucial to know the difference between a regular circuit breaker and a circuit breaker installed with shunt trip accessories.

The shunt trip definition means that it is a way to cut off electrical power through other sensors, not just via thermal activation. Since this is an optional accessory for a circuit breaker, it is not required for a home electrical system.

However, it is recommended for added safety. This is especially true if you’re working with industrial machinery. Furthermore, you can use it as a manual emergency switch to shut down your main breaker.

Before installing a shunt trip, consider its cost and your existing system. You may need to change the breaker panel  and circuit breakers, especially if it is not compatible with shunt trips. You may also need a new line to connect the remote emergency switch to your breaker box.

Generally, most commercial kitchens, elevators, and offices have this shunt trip breaker because it is required. Commercial kitchens use this device in compliance with ANSI/ASME CSD-1, while elevators and escalators comply with ASME A17.1. These codes refer to the controls and safety standards provided by ASME’s.

This question is a topic of discussion among Reddit members as well. Join the conversation here:

Found at a dominos by u/Guilty_Sympathy_496 in electricians

Mostly, installing a shunt trip relay requires that the breaker and the shunt be from the same maker. Also, not all breaker models are compatible with this accessory.

Once you’re sure that your system can take a shunt trip accessory, installation is pretty much straightforward. You can watch this video by Aaron CBIONE for some tutorials.

Note: Every circuit breaker comes with different instructions. It would depend on the brand and model of the breaker .

However, the critical part of every installation is that you need to connect the shunt to your sensor. You may need a shunt trip breaker diagram as a reference to ensure correct installation.

Also, check the brand and model of your breaker before proceeding with the installation. Some makers only allow a factory install of the shunt trip and other accessories. DIY installation may void the warranty of your breakers. It’s best to read up on the manual or consult an electrical professional before making any changes.

What is a shunt trip breaker? The shunt trip is an optional accessory for a circuit breaker for added protection to your system. It is designed to connect to a secondary sensor. It will trip the breaker automatically if the sensor is triggered. It can also be activated via a remote switch that you can install.

Do you think that a circuit breaker is enough to protect your investment? Or do you want an additional layer of protection for your electrical circuit? If you’re not decided yet, reach out to me in the comments section below, and I will be happy to help you.

I am Andrew Wright. With 8 years of experience designing, installing, and maintaining electrical power systems. I love my job, and I have always wanted to offer others the necessary help so they can take care of their houses.

• Semiconductors
• $2 for 1-8 layer PCBs

What Is A Shunt Trip Breaker & How Does It Work? Detailed Guide

Hello readers welcome to the new post. In this post, we will learn What Is A Shunt Trip Breaker & How Does It Work. The shunt trip breaker is a combination of a shunt trip accessory and a main circuit breaker. it connects to the main breaker for the protection of the electrical system. it also added security to the system since it manually or automatically cut the supply in the circuit. In this post, we will discuss the all details shunt trip breaker and other parameters. So let’s get started What is a shunt trip

Table of Contents

What is a Shunt Trip Breaker?

If the circuit breaker trips it finds faults condition and automatically shuts off the current flow to prevent the circuit from overheating.  The shunt trip breaker is an optional device for a circuit breaker that helps to trip the breaker remotely in any instant or automatically in case of surge saving any damage and instrument damage.

There are 2 main types of shunt trip breakers first one is manual and the second one is automatic.

Manual witches help to off the breaker externally with the use of the remote button. Automatic switch off power when detecting surges from the external power supply.

 How Does a Shunt Trip Breaker Work?

Normally the current passes through the circuit breaker. But if these currents become high surges, the larger surge of power changes the electromagnet below the breaker switch, tripping the cutting power and switch.

The shunt trip breaker offers extra techniques to charge the electromagnet and trip switch, helping remote or automatic power shutoff. Some hunt trips are connected to an external power supply.  When power surges get that source, signal flow from shunt trip to the breaker, mechanical cutting power.

The shunt trip can make a connection with the remote switch outside the building. Pushing the button on the switch sends a surge through shunt trip wiring and off the power.

 Components of  Shunt Trip Breaker

Read more  Top Reasons Why Electric Outlet Stopped Working Breaker Not Tripped?

A shunt trip breaker comes with differnt components:

• The frame of the shunt trip circuit breaker works as an external protective housing and covers all inner components. it is made with the use of durable materials like metallic that help to avoid damage to sensitive inner circuits.
• Contacts are the main part of the circuit breaker that carries electric current. in a shunt trip circuit breaker, there are two types of contacts, main contacts, and auxiliary contacts. The main contact is used for normal power transmission, and auxiliary contacts are used for connecting the external control system

Operating Mechanism:

• The working phenomena in shunt trip circuit breakers help to open and close contacts. it comes with latch releases and trip units. The latch releases are used for maintaining contacts in the closed position until the trip mechanism works. The trip unit detects abnormal electrical conditions and starts the tripping process.

Electromagnet:

• At the core of the shunt trip circuit breaker electromagnet exists, which is important for working. If the external signal gets, the electromagnet activates and produces a magnetic field. This field work on latch releases resulted to open circuit breaker contacts.
• It is the main part of the shunt trip breaker that operates uniformly with an electromagnet. its working is to get an external signal and convert into electrical energy. this energy is used to producing the field needed for tripping breaker.

Why Are Shunt Trip Breakers Important?

irrespective optional nature of the shunt trip breaker, it can be an important safety instrument in a power system. As a result, many engineers use this breaker as a layer of security since they save damage during power surges.

This breaker is good for many fonts but it’s commonly used during fire. By turning off power if a fire breaks out, the electrical hazard is no main risk. Some connections shunt trip to smoke alarm in homes, for power automatically off when detector trigger alarm. It not be good option, since in some conditions smoke alarm gets off due to steam from the shower of smoke from the kitchen

 Applications of Shunt Trip Breakers

• In commercial buildings like offices, and shopping malls, shunt trip circuit breakers are connected to ensure sure safety of many components and protect them from electrical faults. It also connected with a building management system to help remote operations
• Industrial facilities mostly work with high-power machines, so electrical safety is needed. Shunt trip breakers are used in such facilities for protection from faults and to reduce the chances of electrical accidents.
• Laboratories and research facilities also use these breakers since they are equipped with sensitive devices.
• There is a need for a regular power supply for critical patient care. Shunt trip breakers help to make sure emergency power is constant without any interruption.
• Data centers come with computing devices and sensitive data. Shunt trip breakers are used to protect these facilities from electrical hazards.

 Advantages of Shunt Trip Breakers

• The main benefit of a shunt breaker is that it can remotely shut off in case of any fault. It quickly works and disconnects power in fire which helps to avoid damage in the home and protects people.
• These devices also increase safety levels and security by automating off power to the circuit if there is any fault. it helps to save electrical fires and any other damage.
• The shunt breaker is easily connected and confined with a power system, so it is easy to install the device in the building.
• The shunt breaker is a less cost solution for safety measures in buildings and industries. it is less costly to buy and connect and helps to save homes and buildings in the result of high fault.
• Shunt breakers support many electrical systems and devices so it is versatile devices that are used for the protection of circuits.

 Comparison with Other Circuit Protection Devices

Shunt trip breakers vs. standard circuit breakers.

The basic difference between shunt trip breakers and regular circuit breakers is their function. Regular breakers are manually operated and based on a user-to-flip switch if requried or on current overloading that triggers the unlatching process.

While shunt trip breaker provdies more layers of controls. it can be triggered remotely with the use of a switch or automated system. These features allow them to immediately off power in case of fault.

Shunt trip breakers vs. ground fault circuit interrupters (GFCIs)

GFCI monitors equality between L1 and L2, if there is more than predefined difference in trips. The shunt breaker is a combination type device that combines in regular breaker with its regular function trip it has a remote control to trip breaker.

Ground fault breakers monitor current on neutral wire flowing back to the neutral bar, the four to six-milliampere different trip breakers, and shunt trip breakers can tripled remotely from other switches or points. In industrial uses, it is used to shut off in emergency condtion, when access to an electrical panel is difficult.

Shunt trip breakers vs. arc fault circuit interrupters (AFCIs)

Shunt Trip Breaker

• It used for overloading and short protection
• its working principle is based on thermal magnetic trip
• Its detection range is 10 to 1000A
• its response time is 10 to 20 milliseconds
• It used for arc fault protections
• It works based on a microprocessor for detecting arcing
• The detection range is 5 to 6000 A
• Response time is 10 to 40 milliseconds

What Are 3 Types Of Shunt Trip Breakers?

• Standard breakers
• Arc fault circuit interrupter circuit breakers

Shunt trip breaker wiring

Follow these steps for shunt trip breaker wiring.

• First of all, see the diagram shown below.
• Arrange requried tools and materials like wire strippers, nuts, and voltage tester.
• Remove the power and wire that shunt the breaker according to instructions.
• Again connect power to the circuit and test breaker to check that working well

Diagram of Shunt Trip Breaker Wiring Diagram

WHICH TYPE OF SHUNT TRIP BREAKER TO USE?

The manual breaker is best to use for small buildings or conditions where any technical staff is available to reset the breaker,. The automatic breaker can be best for larger-size buildings or conditions where there is no option for staff for breaker resetting.

it is also preferred for trigger shunt trip breakers at a distance or remotely. These relays are connected to fire alarm systems and can send a signal to the breaker for tripping if there is any fault.

Read more  How Many Outlets on a 15 Amp Circuit Breaker?

How Many Outlets on a 15 Amp Circuit Breaker?

60 Amp Wire Size – Which AWG is Best for 60 Amp Breaker

Difference Between a Single and Double Pole Breaker

Where is the Doorbell Breaker Located? Easy Way to Findout

Difference Between Fuse and Circuit Breaker

How does a shunt trip breaker work?

The shunt trip is a device in the circuit breaker that mechanically trips the breaker when power is given to shunt trip terminals. Power for shunt trip does not come in breakers, so it provided from an external source

How is a shunt trip breaker wiring?

Make the connection of accurate voltage (120V to 240V for the -1021 suffix) with 2 terminals on the shunt trip. Land with a leg from source contact on one terminal and a neutral wire. (L2 , X2 ) to the other terminal

What is the purpose of a shunt with a relay?

Shunt relays are used to bypass normal controls like switches , dimmers, or panel-mounted relays when employed on an emergency circuit.

What is shunt trip and under voltage?

The shunt trip coil is connected to the breaker to offer a remote trip of the breaker but Undervoltage or no voltae coil is connected to offer automatic tripping when power losses occur or when there is a major voltage dip.

Where is shunt trip used?

The shunt trip helps to remotely and fastly turn off the breaker when needed especially in conditions where safety and speed is important, like during a fire or when there is needed to isolate certain areas of the electrical system without physically going to the breaker

What is the difference between shunt and resistance?

The shunt is an electrical device that produces a low resistance path for current. It helps current to flow to another point in cirucit. Shunts are also referred to as ammeter shunts or current shunt resistors.

What is the purpose of a shunt breaker?

its main purpose is to remotely and fastly turn off  circuit breaker when necessary

Is the shunt resistor AC or DC?

Shunt provdies DC mV signal for driving moving coil ammeter, overlading protection, and control units for high amper range.

Where are shunt trip breakers required?

These breakers are used in commercial  and industrial buildings, also for facilities where safety is a top priority

Why is it called a shunt resistor?

In older circuits, resistors connected in parallel to the ammeter as shunts for expanding the current measuring range called shunt resistors. but now resist used for detection circuit current  collectively referred to as shunt resistors

Why is low resistance called shunt?

When a resistor is connected with another resistor of low value, then the equivalent resistance is less the lowest resistor, that is shunt resistors.

What is another name for a shunt resistor?

Shunts also called ammeter shunts  or current shunt resistors.

What is a unit of shunt resistance?

The unit of shunt resistance is ohm (Ω).

What is shunt resistance formula?

The shunt resistance formula is:

• Rs is the shunt resistance
• V is the voltage of the shunt resistor
• I is the current passing through the shunt resistor

What is shunt release in a circuit breaker?

The shunt releases is opening coil plus release. Thermal trips and electromagnetic trips also use trip units. use a certain voltage to shunt trip the coil, and the breaker will trip and open.

What is the difference between a shunt trip and series trip?

What are the different types of shunt trip breakers, does a shunt trip breaker need a neutral, what is the difference between shunt trip and a shunt close.

When used as a shunt trip the coils trip breaker when a rated voltage is given. When used as shunt close, coils closes breaker when voltae is provided

Share this:

Wholesale PCBs SMT Stencil & PCBA Service Provider

Special offer:$2 for 1-8 layer PCBs 

Sign Up & Get 54$ Coupon

Author:  Scott Spencer

I am professional content writer have professional degree in engineering. I have worked in different famous companies and also providing technical and seo based services clients all over the world. With that i am sharing my knowledge to engineering and technical students and new learners to enhance their learning and get new ideas in technical fields. Follow him on Twitter and Facebook .

Related Posts

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Save my name, email, and website in this browser for the next time I comment.

Post comment

• Electrical , How To & Guides

Shunt Trip Breaker Explained: What It Is And How It Works

• September 8, 2024

Electrical safety is a priority, but understanding all the components involved can be challenging. If you’ve heard of a shunt trip breaker but aren’t sure what it does, you might be missing a key piece of the puzzle. This lack of knowledge can lead to unsafe installations or unexpected issues down the road. In this blog post, we’ll explore what a shunt trip breaker is, how it operates, and why it’s a critical component in maintaining electrical safety.

What Is A Shunt Trip Breaker?

A shunt trip breaker is a special type of circuit breaker that can disconnect power remotely. It has a built-in mechanism that can be triggered from the outside to break the circuit. This feature is important for handling electrical hazards and maintaining safety in various settings.

The key function of a shunt trip breaker is its ability to trip or shut off when it gets an external signal. This signal can come from devices like smoke detectors, gas sensors, or emergency stop buttons, making it useful in many safety applications.

Shunt trip breakers are often used in systems where an emergency power cutoff is needed to prevent fires, equipment damage, or other safety risks. Their design allows for a quick response to emergencies, adding an extra layer of safety to electrical circuits . Using a shunt trip breaker helps ensure that power can be safely and quickly turned off when needed.

How Does A Shunt Trip Breaker Work?

A shunt trip breaker combines mechanical and electrical elements, enabling it to respond to external signals to trip. The key part is the shunt trip coil, an electromagnet linked to an external control circuit.

When an external signal is sent to the breaker, it energizes the shunt trip coil. This energy flow generates a magnetic force that triggers the breaker’s tripping mechanism, which immediately separates the contacts, cutting off the power and isolating the connected circuit.

This function is crucial in situations where manual intervention might be too slow or automated safety responses are needed. It ensures power can be quickly and safely cut in response to emergency signals, such as fire alarms or other safety system triggers.

Shunt trip breakers enhance safety by allowing electrical circuits to be swiftly deactivated from remote locations, improving the overall safety of electrical installations.

What Is A Shunt Trip Circuit Breaker?

A shunt trip circuit breaker works like a regular circuit breaker but with a special feature for remote tripping. It has a shunt trip device that can be triggered by an external signal. This feature adds safety by allowing the breaker to trip under specific external conditions, not just electrical faults.

The external signal might come from a fire alarm, gas detector, or other safety systems. When the signal is received, the shunt trip device activates and trips the breaker. This quick action helps prevent disasters by cutting off power immediately when needed.

Shunt trip circuit breakers are common in commercial and industrial settings where quick power disconnection is vital for safety and compliance with regulations.

Types Of Shunt Trip Breakers

Shunt trip breakers can be classified into two main types based on how they are triggered:

• Manual Shunt Trip Breakers : These require someone to manually activate them. They have a control switch or button that, when pressed, sends a signal to trip the breaker remotely. This type is common in systems where personnel need to control and intervene directly.
• Automatic Shunt Trip Breakers : These trip the breaker automatically in response to specific conditions, like a fire alarm or gas detector. They are crucial in environments where immediate action is needed to ensure safety, without relying on human intervention.

Both types are designed to enhance electrical safety, but their use depends on whether manual control or automatic response is more suitable.

Benefits Of A Shunt Trip Breaker

Shunt breakers offer key benefits that make them vital in today’s electrical systems. Here’s what sets them apart:

• Remote Shut-Off Capability: Shunt trip breakers can disconnect power remotely. This feature allows quick shutdowns from a distance, which is helpful during emergencies like fires or gas leaks. Remote shut-off means power can be cut without entering dangerous areas, boosting safety.
• Enhanced Safety And Protection: Shunt trip breakers add another safety layer by automatically disconnecting power when triggered by external signals. This quick response helps prevent accidents and equipment damage, which is crucial in environments where safety is key.
• Ease of Installation And Integration: Installing a shunt trip breaker is easy and fits well into existing electrical systems. This simplicity cuts down on installation time and costs, making it an efficient way to improve system safety.
• Cost-Effective Solution: Shunt trip breakers prevent damage and reduce the risk of hazards, making them a cost-effective safety option. They protect expensive equipment and minimize downtime in emergencies, leading to long-term savings.
• Versatile Compatibility: Shunt trip breakers work with various electrical systems and safety devices. This versatility makes them suitable for residential, commercial, and industrial use. Their ability to integrate with different systems ensures they can be used effectively in many environments.
• Automated Emergency Response: Shunt trip breakers are vital where quick, automated actions are needed. They can be set to react to signals from devices like smoke detectors or heat sensors. This means they can cut off power on their own, reducing human mistakes and speeding up danger control. This boosts safety in the facility.

Where Are Shunt Trip Breakers Frequently Used?

Shunt trip breakers are essential in environments where safety and emergency power control are top priorities. You’ll frequently find them in the following settings:

• Commercial Kitchens: Shunt trip breakers help prevent fires by disconnecting power in case of gas leaks or other hazards.
• Industrial Sites: They ensure quick power cutoffs during emergencies, protecting equipment and personnel from electrical accidents.
• Healthcare Facilities: In hospitals and clinics, shunt trip breakers are vital for maintaining safety by instantly shutting down power in critical areas if needed.
• Data Centers: These breakers protect sensitive equipment from damage by automatically cutting power during emergencies.
• Educational Institutions: Schools and universities use shunt trip breakers to enhance safety, especially in laboratories and other high-risk areas.
• Elevator Systems: Shunt trip breakers are used to safely shut down elevators in case of emergencies, such as fire or power failure.

Also check:

• 8 Best Circuit Breaker Finder Reviews
• How Much Does It Cost To Replace a Circuit Breaker?
• Double Tapped Breaker – How To Fix?
• How To Fix “Air Conditioning Breaker Keeps Tripping” Issue?
• What Causes An Arc Fault Breaker Tripping – How To Fix It?

When choosing a shunt trip breaker, consider the size of the facility and the availability of personnel. For smaller buildings with staff on hand, a manual shunt trip breaker may be sufficient. In larger buildings or where immediate access is limited, an automatic breaker is more suitable. Additionally, a shunt trip relay can integrate with fire alarms or emergency systems, allowing remote tripping during emergencies for enhanced safety.

Installing a shunt trip breaker is generally recommended to be done by a qualified electrician. It requires knowledge of electrical systems and safety procedures.

A standard circuit breaker relies on thermal or magnetic elements to trip when an overload or short circuit occurs. A shunt trip breaker, on the other hand, is externally controlled and can be tripped independently of the current flowing through the circuit.

While primarily used in commercial and industrial settings, shunt trip breakers can be used in residential applications for specific purposes, such as generator interlock systems or fire safety systems. However, they are less common in homes compared to standard circuit breakers.

While shunt trip breakers offer many advantages, they may not be suitable for all applications. Factors such as the required tripping speed, fault current levels, and environmental conditions should be considered when selecting a breaker.

A shunt trip circuit breaker is key to improving electrical safety, enabling quick and remote power disconnection during critical situations. This feature is especially important in environments where immediate action is necessary to prevent accidents. Integrating this device enhances safety and protection in both commercial and industrial systems.

Related Posts:

• Water Heater Tripping Breaker
• What Causes a Circuit Breaker To Trip
• Single Pole vs Double Pole Breaker | Which Has…
• What Size Wire For 40 Amp Breaker ?
• GFCI Circuit Breaker Wiring | Basics of GFCI Breaker
• What Size Breaker For Dryer?

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Get our Latest Newletters

Get great content that you love. No ads or spams, we promise.

How To Guides

Android Apple Windows Email YouTube Instagram SnapChat Gaming Discord Cloud Storage Google Sheets

Product Reviews

Home & Security Camera Motherboard PC & PC Accessories Laptops Speakers Car Accessories Air Conditioner Lawn & Garden Software Modem & Router

For Students

Electronics Projects Arduino Projects Embedded Free Circuits Mini Projects Robotics Sensor Cables & Wires RV Systems Solar

Interesting

Insights Tutorials Upcoming Sales Usernames Symbols Calculators Courses Deals Our Story

• Affiliate Disclosure
• Terms and Conditions
• Privacy Policy

Copyright © 2024 Electronicshub.org

• Electrical Repair
• Lighting Installation
• Hot Tub Wiring
• Emergency Electrical Service
• Ceiling Fan Installation
• Generator Installation
• Commercial Lighting Services
• Electrical Inspection
• What Is a Shunt Trip Breaker and How Does It Work

What Is a Shunt Trip Breaker and How Does It Work?

First things first: what is a shunt trip breaker? A shunt trip breaker is a specialized circuit breaker that is designed to remotely shut off power to a circuit in emergency situations, such as a fire or security breach. These breakers are commonly used in commercial and industrial buildings, as well as other facilities where safety is a top priority. In this article, we'll explore this type of breaker in detail and explain why hiring an  electrical services provider for a wiring shunt trip breaker is essential. 

The Many Benefits of a Shunt Breaker

Let’s recap: a shunt trip breaker is an electrical component connected to a circuit breaker and allows for remote operation through a schematic and AMP connection. Now that you know what a shunt trip circuit breaker is, it's time to move to the next part of this article: the benefits of using a shunt breaker.

• Remote Shut-Off: One of the main benefits of shunt breakers is that they can be remotely shut off in the event of an emergency. This allows them to quickly and easily disconnect power in a fire or other emergency, which can help prevent damage to the building and protect the occupants.
• Increased Safety: Besides remote shut-off, shunt trip circuit breakers provide an added level of safety and security by automatically shutting off power to a circuit in the event of an emergency. This helps prevent electrical fires and other hazards, protecting both people and property.
• Easy Installation: Shunt breakers are relatively easy to install and can be integrated into existing electrical systems, making it possible to retrofit older buildings with these devices.
• Cost-Effective: A shunt breaker is a cost-effective solution for increasing safety and security in commercial and industrial buildings. They are relatively inexpensive to purchase and install and can help prevent costly damage to the building and its contents in case of any emergency.
• Compatibility: Shunt breakers are compatible with a wide range of electrical systems and devices, making them a versatile and practical solution for increasing safety in various settings.

How Does a Shunt Trip Breaker Work?

A shunt trip breaker works by tripping the breaker when it receives a signal from an external device, such as a fire alarm or security system. This helps to prevent dangerous electrical fires or other hazards. When an emergency occurs, the external device sends a signal to the breaker, which causes the breaker to trip and open the circuit, interrupting the flow of electricity and preventing power from reaching the circuit, allowing for a quick and easy power disconnection.

Types of Shunt Trip Breakers

Now that you know the answer to "How does a shunt trip breaker work", it's time to discover about the two main types of shunt trip breakers.

• Manual Shunt Trip Breaker: This type of trip breaker requires manual intervention to reset the breaker after it has been tripped, meaning someone must physically go to the breaker and reset it after an emergency situation. This breaker is typically used in smaller residential buildings or situations where a dedicated staff member is available to reset the breaker.
• Automatic Shunt Trip Breaker: This type of breaker can automatically reset itself after being tripped and is typically used in larger buildings or in situations where there is not always someone available to reset the breaker. These breakers are often connected to fire alarm systems or other emergency management systems for auto-reset.

When is a Shunt Trip Breaker Required?

If you're wondering when is a shunt trip breaker required, know that it is required in any electrical system where there is a need to quickly and easily shut off power in the event of an emergency, such as a fire or security breach. Continue reading as we describe the importance of using shunt trip breakers and how to figure out which one you need to use for your building or facility.

The Importance of Using a Shunt Trip Breaker

• Shunt trip breakers automatically shut off power in emergencies.
• They prevent dangerous electrical fires and other hazards.
• They allow for quick and easy power disconnection in emergencies.
• They are easy to install and cost-effective solutions for increasing safety.
• They can be connected to fire alarm and emergency management systems.
• They ensure that the electrical system is in compliance with safety regulations.
• They are a versatile and practical solution for increasing safety in various settings.

Which Type of Shunt Trip Breaker to Use?

A manual breaker may be appropriate for a smaller building or in situations with a dedicated staff member available to reset the breaker, while an automatic breaker may be more appropriate for a larger building or in situations where someone is not always available to reset the breaker. Another option to consider is the use of a shunt trip relay, which can be used to trigger a shunt trip breaker remotely. These relays are typically connected to fire alarm systems or other emergency management systems and can send a signal to the breaker to trip it when an emergency occurs.

Shunt Trip Breaker Wiring Diagram

If you're wondering how to wire a shunt trip breaker, know that wiring can seem like a daunting task, but with the right knowledge and tools, it can be done relatively easily. Follow the steps below:

• Obtain a "How to wire a shunt trip breaker wiring diagram." (Check above).
• Gather necessary tools and materials such as wire strippers, nuts, and a voltage tester.
• Disconnect the power and wire the shunt breaker according to the instructions provided.
• Reconnect power to the circuit and test the breaker to ensure it works properly.

It is important to pay close attention to the diagram and follow the instructions carefully. This will ensure that the breaker is wired correctly and functions. Once the wiring is complete, you can reconnect the power to the circuit and test the breaker to ensure that it is working properly. It is always better to consult with a professional if you aren't confident about the wiring process. 

What Does a Shunt Trip Breaker Do?

We hope by now you know what does a shunt trip breaker do, but here's a recap: a shunt trip breaker is a specialized circuit breaker that protects your house electrical systems from damage or hazards in emergencies. It works by tripping the breaker when it receives a signal from an external device, such as a fire alarm or security system, preventing dangerous electrical fires or other regular hazards.

Nevertheless, it is important to understand what does shunt mean in electrical terms and the role of electrical shunt trip breakers in commercial and industrial settings. Finally, to determine the appropriate type of breaker for your specific needs, it is best to consult an electrical services provider. If you're based in Colorado or surrounding areas, McCarrick Electric has got you covered.

Superior Electrical Solutions in Colorado 

At McCarrick Electric, we have 25+ years of experience providing top-quality electrical services in Colorado. We value all of our customers, and that's why we offer a 15% discount for first-time residential clients and veterans. We take pride in our integrity, attention to detail, and cost-effectiveness. For more information, connect with us via our contact form or give us a call.

Latest Blog Entries

What to Do If Your Circuit Breaker Keeps Tripping?

Why Is Your Breaker Box Outside House? Here Are the Reasons

Why Won’t My GFCI Outlet Reset? How to Troubleshoot a GFCI Outlet

5 Ways to Prevent Short Circuits

What Is A Shunt Trip Breaker & How Does It Works?

Table of Contents

What Is A Shunt Trip Circuit Breaker?

How does a shunt trip breaker work, why are shunt trip breakers important, where do people most often use shunt trip breakers, installing a shunt trip accessory to a breaker, does shunt trip breaker work, what are 3 types of shunt trip breakers, why is shunt used in mccb, erik watkins, submit a comment cancel reply, what is a gfci outlet receptacle what does it stand for, gas vs. electric lawn mower: is battery as good as gas, extension cord gauge/length chart: amp rating & size, dimmable led flash: led light bulbs flickering solutions, crouse hinds compatible breakers & replacement chart, what size wire for 40 amp circuit breaker.

Please leave this field empty.

• All Products
• Cutler Hammer
• General Electric
• Commercial Circuit Breaker
• Residential
• Circuit Breaker Lugs
• Circuit Breaker Terminals
• Circuit Breaker Box
• Filler Plates
• Auxiliary Switches

What Is a Shunt Trip Breaker

22 December, 2021

What Is a Shunt Trip Breaker and How Does It Work?

If you’re looking for an easy way to shut off the electrical supply in your circuit, installing a shunt trip breaker may be worthwhile. Shunt trips can add additional protection to your electrical system to prevent short circuits and injury during a disaster in your home, such as a fire. 

Read on to learn the answers to “What is a shunt trip breaker?” and “What is the purpose of a shunt trip breaker?”’ 

What Is a Shunt Trip Circuit Breaker?

When a circuit breaker “trips,” it detects a fault condition and automatically shuts off its electrical flow to prevent the wiring from overheating. 

A shunt trip breaker is an optional accessory for your circuit breaker that can allow you to trip the breaker remotely at any time or automatically during a surge, preventing injuries and equipment damage during emergencies. 

There are two main types of shunt trip breakers: automatic and manual. Manual switches allow you to turn off the breaker outside the building using a remote button. Meanwhile, automatic switches shut off power as soon as they detect a surge from an external power source. 

How Does a Shunt Trip Breaker Exactly Work?

Typically, electrical currents travel through your house’s circuit breaker unchanged. However, when these currents surge too high, the extra surge of power charges an electromagnet beneath the main breaker switch, tripping the switch and cutting power. 

A shunt trip breaker provides an additional method to charge the electromagnet and trip the switch, allowing for a remote or automatic power shutoff. 

Some shunt trips connect to an external power source. Anytime a power surge reaches this source, a signal travels from the shunt trip to the breaker, mechanically cutting the power. 

Alternatively, a shunt trip can connect to a remote switch outside the building. Pressing a button on this switch sends an electrical surge through the shunt trip wiring and shuts off the power that way. 

While shunt trip breakers are not required in homes, many homeowners install them as a safety precaution. However, these devices are also common in businesses that use industrial machinery or expensive electrical systems that could experience damage during a power surge. 

Why Are Shunt Trip Breakers Important?

You can use a shunt trip breaker within your home to create an additional way to shut off your house’s electrical current during an emergency, preventing injury or electrical damage. 

One of the most common ways people use shunt trips is to shut off electrical equipment during a fire. Connecting the shunt trip to a smoke alarm can automatically shut off electricity as soon as the smoke detector triggers an alarm, preventing electrical hazards from the fire. 

Installing a shunt trip may be especially important if your smoke detector connects to a sprinkler system. This device can shut down your electrical power as soon as the smoke detector triggers the sprinklers, reducing the risk of electrocution and minimizing damage to your electrical equipment. 

Installing a shunt trip breaker is a quick and easy safety precaution that could prevent injury and expensive electrical damage down the line. Now that you know the answer to “what is a shunt trip breaker used for?” browse our Electrical Supply Distribution inventory of shunt trips today to discover the perfect shunt trip breaker for your home.

Share This Post

Related blog posts.

Reasons Why Does Your GFCI Keep Tripping?

How Many Outlets on 15 AMP Breaker: Explained

How Many Watts Can a 15 Amp Breaker Handle?

Tell Us About Your Project

First Name *

Last Name *

Please leave this field empty. Please leave this field empty.

Phone Number *

Description

Send Us The Picture Of Your Project

Circuit Breaker Accessories Explained

The purpose of accessories on a power circuit breaker is to provide additional functions and protection beyond basic circuit interruption. For example, a motor can automatically charge the closing spring of the breaker, reducing the time required for the breaker to close.

Other accessories can offer additional functions, such as undervoltage or overvoltage protection, or enable remote operation of the breaker. These accessories enhance the safety, reliability, and functionality of the power distribution system.

Circuit breaker accessories are matched to the system control voltage and may be available as factory-installed options or in field-installable kit form. Some typical control voltages include: 250VDC, 240VAC, 120VAC, 125VDC, 48VDC, 24VDC.

Auxiliary Switch

Auxiliary Switches provide remote indication of the breaker main contact position, changing state when the minimum isolating distance between the main contacts is reached. They typically feature Form C contacts, with options for both NO (Normally Open) and NC (Normally Closed) states, sharing a common neutral.

A Contact – Open or closed same as the breaker.

B Contact – Opposite to the breaker contacts.

Connected/Closed Switches

Connected/closed switches combine information from the “connected device” and “closed device,” indicating that the “circuit is closed.”

Bell Alarm / Overcurrent Trip Switch

The overcurrent trip switch provides remote indication that the circuit breaker has opened due to an electrical fault. Typically equipped with one set of Form C contacts, offering options for both NO (Normally Open) and NC (Normally Closed) states with a common neutral. The switch is activated, and the outputs change state whenever the breaker is tripped by an overcurrent, ground fault, or protective relay function via the Trip Unit.

A trip caused by the manual OPEN button or by the Shunt Trip or Undervoltage Trip Device accessory does not activate the Bell Alarm. The accessory can be reset, returning the contacts to their normal configuration, by reclosing the breaker or by manually resetting the target on the breaker escutcheon.

Bell Alarm Lockout

The Bell Alarm with Lockout prevents closing of the breaker after a protection trip until the lockout is reset.

Electric Reset

The electric reset is used to reset the circuit breaker remotely after an electrical fault.

Ready-to-close Switch

The ready-to-close switch indicates that the following conditions are met and the circuit breaker can be closed:

• The circuit breaker is open
• The closing springs are charged
• The circuit breaker in not locked/interlocked in open position
• There is no standing closing order
• There is no standing opening order

Spring-Charging Motor

The spring-charging motor provides a means of electrically charging the closing springs automatically after the circuit breaker closes. When the springs are fully charged, a cutoff switch automatically de-energizes the motor. The closing springs will recharge automatically after the breaker closes unless an external switch contact is wired into the spring-charging circuit.

Spring-Charged Contact

The spring-charged contact indicates that the circuit breaker is charged. Usually a form C contact.

Shunt Trip / Shunt Close

The shunt trip coil opens the circuit breaker when energized. Shunt Close will close a circuit breaker when energized if the device is ready to close. Shunt trip and shunt close share the same coil; the action is determined by the location of the coil. The shunt close accessory features an anti-pump feature that prevents the breaker from repeatedly closing if the closing signal is maintained.

Undervoltage Trip

The undervoltage trip opens the circuit breaker when its supply voltage drops below the threshold voltage. Undervoltage trip coils require continuous power supply to keep the circuit breaker closed.

Time-Delay Module for Undervoltage Trip

The time-delay module for the undervoltage trip can be used to set an adjustable time delay before the undervoltage trip opens the circuit breaker, preventing nuisance tripping from a momentary voltage drop. The time-delay mechanism is connected in series with the undervoltage trip (MN) and is installed outside of the circuit breaker.

Electric Lockout

The electric lockout accessory uses a coil similar to an Undervoltage Trip Device to prevent the breaker from closing unless the coil is energized. Consequently, the breaker cannot be closed unless control voltage is applied; however, the loss of control voltage will not trip the breaker.

For instance, two breakers can be interlocked to ensure that they cannot both be closed simultaneously. The Electric Lockout coils on the two breakers to be interlocked can be wired in series with a normally closed Auxiliary Switch contact on the other breaker to provide the interlocking function. Mechanical bypass is utilized to permit cold startup when control power is not available.

Electrical Closing Push Button

The electrical closing push button closes the circuit breaker electrically via the shunt close. Requires installation of shunt close.

Operations Counter

The operations counter registers the total number of operating cycles for the circuit breaker.

Communications Module

The circuit breaker communications module provides communication between circuit breaker trip unit and the communication network. Dedicated switches can be used to read status of circuit breaker. Actuators can be used to control the circuit breaker.

Position Switch

The cell position switch indicates the circuit breaker position in the cradle/cell. This accessory is for drawout circuit breakers only and typically contains normally-open and normally-closed contacts. There can be one to three position switches for each type.

• Disconnected

Open-Fuse Lockout

The Open-Fuse lockout is provided on integrally fused breakers or when the breaker is used in combination with a Fuse Rollout Element. When any fuse blows, the Open-Fuse Lockout trips the breaker to prevent single-phasing.

An indicator shows which fuse has blown. The breaker is mechanically trip-free and cannot be reclosed until the blown fuse is replaced, and the Open-Fuse Lockout is reset.

Hidden-Close Button

The Hidden Close Button is an unmarked replacement for the normal CLOSE button. Pressing the Hidden Close Button in the usual manner will not close the breaker; instead, a rod inserted with light pressure is used to engage the hidden-close button.

• Square D MasterPact NW Circuit Breakers Instructions
• General Electric Wave Pro Circuit Breakers User Guide
• EATON Magnum DS Circuit Breakers User Manual

• Popular Topics
• Latest Topics
• Forum Archive
• News and Announcements
• Jobs ABM | AEIS
• Articles & Guides
• Electrical Testing Talk
• Productivity Tools
• Webinar Agenda
• Industry Links
• Terms Library

Certification Training

• Practice Exams
• ETT Study Guide
• QEMW Study Guide
• CET Study Guide
• Recommended Reading
• Certification Archive
• Start Your Career
• Connect & Discuss

Help and Support

• How to Sign Up
• User Guidelines
• Privacy Policy
• Terms of Service
• All Help Topics

Popular Topic Tags

This website is not affiliated with, maintained, authorized, endorsed or sponsored by the International Electrical Testing Association (NETA) or any of its affiliates. The information presented on this website should not be used to replace any kind of classroom or group study led by a certified instructor. The use of all copyrighted material on this website is provided for the purposes of teaching, scholarship, and research, and is therefore considered to be covered as "fair use" as specified in 17 USC § 107 - Limitations on exclusive rights: Fair use. If you are the owner of copyrighted material on this website and feel that our use of such material is not covered under 17 USC § 107, please contact us. TestGuy.net is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Copyright © 2024 TestGuy.net. All rights reserved.

Electricalterminology

Best Blog for Basic Electrical Knowledge

Difference Between Shunt Trip, Undervoltage Release and Closing Coil

Shunt trip, Undervoltage release, and closing coil are the accessories of circuit breakers . Let’s have a look at their definitions and differences. After reading the article you will fully understand their differences.

The shunt trip is an electrical accessory used for the instantaneous opening of the circuit breaker. It is generally controlled through normally open contact. It is also referred to as an opening coil or shunt release. By energizing the shunt trip you can open the circuit breaker remotely.

The range of shunt trips proposes various supply voltages. (For example from 24 V to 415 V)

Q1 selenoid of a circuit breaker that actuates a release mechanism when voltage is applied. When de-energized the system is in the rest position. A normally open contact actuates the system. Tripping does not occur in the event of wire breakage, loose contacts , or Undervoltage.

Undervoltage release

The Undervoltage release is an electrical accessory used for triggering the instantaneous opening of the circuit breaker if the supply voltage drops below a certain level and in particular if the control contact opens. It is generally controlled by normally closed contact.

A passive electromagnetic relay (Q1) actuates a release mechanism when the supply voltage drops or is interrupted. (For example To prevent the automatic restarting of motors) The system is in the rest position when energized. Actuation is produced by a normally closed contact. Undervoltage releases are always designed for uninterrupted operation.

Time-delayed Undervoltage release

Time-delayed Undervoltage release is equipped with an electronic device that delays its operation for around 3 or 4 seconds. It is designed to be used in unstable supplies, where the supply voltage of the release may be subject to variations or micro-breaks, to avoid unwanted opening of the circuit breaker.

Delayed Undervoltage release (Q1) is a combination of a separate delay unit and the respective release. This release is used to prevent brief interruptions in power leading to disconnection of the circuit breaker. The delay time can be set between approximately 0,06…..16 seconds.

Closing coil

The closing coil is an electrical accessory used for controlling the closing of the power contacts of the circuit breaker. The springs of the circuit breaker are to be loaded before the action of the closing coils. It is controlled by NO contact.

In conclusion, understanding the accessories of circuit breakers, such as shunt trip, undervoltage release, and closing coil, is essential for proper circuit breaker operation. Shunt trip is used for remote opening of the circuit breaker, undervoltage release triggers the instantaneous opening of the circuit breaker if the supply voltage drops below a certain level, and the closing coil controls the closing of the power contacts of the circuit breaker. Time-delayed undervoltage release is designed for unstable supplies and prevents unwanted opening of the circuit breaker due to variations or micro-breaks. Knowing the differences and connections of these accessories can help ensure the safety and efficiency of circuit breaker systems.

“If you’re an electrical engineer or know someone who is, check out this hilarious TIIMG Engineer keychain on Amazon! Click here to buy it now!”

Related Stories

Best Electrical Tapes for Outdoor Use: Buying Guide

What is an Arc Flash Relay? How Does it Work?

What is a Dual Function Circuit Interrupter? And Its Function

Advantages and Disadvantages of Incandescent Lamps

VFD Parts: A Guide to Their Essential Functions

Applications of 3-Phase Induction Motors in Industries

• Our Core Values
• Video Learning
• Capabilities
• Air Breakers
• Insulated Case
• Switchgear Repair
• Switchgear Parts
• Vacuum Breakers
• Switchboard Manufacturing
• Power Panelboards
• Switchgear Rental
• Power Transformer Rental
• Replacement Parts
• Molded Case
• Air Contactors
• Vacuum Contactors
• Switchgear Safety
• Testing Switchgear
• Content Library
• 24/7 Customer Service
• Credit Application
• Switchgear Project Gallery
• Social Archives

Shunt Trip Parts In Stock for Remote Tripping Your Circuit Breakers

Remotely trip and disconnect power to a specific circuit, safely and remotely trip circuit breakers.

A shunt trip is an electrical circuit’s equivalent of a heroic maneuver. Consider a circuit breaker to be a guard for your electrical system. Its purpose is to keep things from going crazy if there is too much power present.

Enter the shunt trip, which functions similarly to the guard’s remote control. When you push a button on this remote, a particular coil inside it becomes energized and generates a magnetic field. This magnetic field communicates with the circuit breaker and nudges it, saying, “Hey, time to take a break!”

The circuit breaker receives the signal and says, “Alrighty, shutting down now!” It just opens its connections and cuts off the electricity flow. This comes in handy when you need to rapidly turn off the power from a distance. Consider it a safety switch that you can activate even if you aren’t directly next to the breaker.

In other words, a shunt trip is a remote-controlled means to cause a circuit breaker to trip by utilizing a magnetic magic trick. It’s useful for keeping things secure without having to go around flipping switches.

Are you looking for Shunt Trip parts? We made a video inside our Switchgear and Circuit Breaker Parts Warehouse. This particular video is about Siemens/Allis Chalmers MA Series circuit breaker parts. Below is a little more about a shunt trip for a MA-this breaker’s specifications.

Voltage Rating: The “4.76KV” indicates the voltage rating of the circuit breaker. It suggests that the breaker is designed to handle systems with a voltage of 4.76 kilovolts (kV).

Current Rating: The “1200A” indicates the current rating of the circuit breaker. It suggests that the breaker can carry a continuous current of up to 1200 amperes without tripping.

Operating Mechanism: The “EO/DO” likely refers to the operating mechanisms of the circuit breaker. “EO” stands for “Electrical Operation,” meaning the breaker can be controlled remotely using an electrical signal. “DO” stands for “Manual Operation,” indicating that there’s a manual mechanism to operate the breaker as well.

This video is about Siemens/Allis Chalmers MA Series circuit breaker parts. Below is a little more about this breaker’s specifications. Voltage Rating: The “4.76KV” indicates the voltage rating of the circuit breaker. It suggests that the breaker is designed to handle systems with a voltage of 4.76 kilovolts (kV).

Current Rating: The “1200A” indicates the current rating of the circuit breaker. It suggests that the breaker can carry a continuous current of up to 1200 amperes without tripping. Operating Mechanism: The “EO/DO” likely refers to the operating mechanisms of the circuit breaker. “EO” stands for “Electrical Operation,” meaning the breaker can be controlled remotely using an electrical signal. “DO” stands for “Manual Operation,” indicating that there’s a manual mechanism to operate the breaker as well.

Interrupting Capacity: This specification refers to the maximum fault current that the circuit breaker can safely interrupt without causing damage. It’s crucial for ensuring the protection of the electrical system. Tripping Characteristics: Different circuit breakers can have various tripping characteristics, such as instantaneous, short-time delay, and long-time delay trips. These settings determine how quickly the breaker will trip in response to different levels of fault currents.

Physical Dimensions: The physical size and dimensions of the circuit breaker are important to ensure that it fits within the designated switchgear or electrical enclosure. Environmental Ratings: These ratings indicate the operating conditions the circuit breaker is designed for. This includes factors such as temperature range, humidity, altitude, and indoor/outdoor usage.

Accessories: Circuit breakers can come with various accessories like shunt trips, auxiliary switches, ground fault protection, and more. These accessories enhance the functionality and safety of the breaker. Standards Compliance: The circuit breaker should meet relevant industry standards, such as those set by organizations like ANSI, IEC, or IEEE.

Documentation: The manufacturer should provide detailed documentation that includes installation instructions, operation guidelines, maintenance procedures, and troubleshooting information. For accurate and updated information on the MA-250C Allis-Chalmers 1200A 4.76KV EO/DO Air Circuit Breaker, reach out to the manufacturer directly or consulting official product manuals and specifications.

BCS Switchgear is an industry leader in new and obsolete electrical control and distribution equipment. Since 1997, BCS has been servicing customers to extend electrical life of low and medium voltage electrical power equipment.

Cody can be reached by email: [email protected]

• Privacy Policy
• Terms & Conditions

888- 599- 0486

GET A QUOTE

Please fill out the appropriate information below.

Name: Name: Name: Message:

• Get custom product tools and services
• Access training
• Manage support cases
• Create and manage your orders (authorized partners only)

Schneider Electric USA Website

Search FAQs

What is the difference between a shunt trip and shunt close device on a masterpact breaker, released for: schneider electric usa, attachment(s).

Articles that might be helpful

Discuss this topic with experts

Start here!

Find answers now. Search for a solution on your own, or connect with one of our experts.

Contact Support

Reach out to our customer care team to receive more information, technical support, assistance with complaints and more.

Where to buy?

Easily find the nearest Schneider Electric distributor in your location.

Search topic-related frequently asked questions to find answers you need.

Contact Sales

Start your sales inquiry online and an expert will connect with you.