what's a shunt trip breaker

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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.

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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

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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.

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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

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• 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.

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

Have you ever heard about this kind of breaker? And “what a shunt trip breaker is” usually appears when you hear about this for the first time.

Keep this article to get the best answer to the question above, its primary use, and when it is required.

Table of Contents

What Is A Shunt Trip Circuit Breaker?

A circuit breaker “trips” once it detects a problem, cutting off power to the outlet or appliance in question and protecting the wire from burning.

An optional attachment to any circuit breaker, a shunt trip breaker allows for the breaker to be shut off remotely at any moment or immediately in the event of a power excess. Damage to or injury from equipment may be avoided in a crisis if this is in place.

There are two distinct categories for shunt trip breakers, automatic and manual. The breaker may be turned off from the exterior of the building through a remote button using manual switches. Conversely, mechanical switches interrupt power flow when they identify a surge coming from the grid.

How Does A Shunt Trip Breaker Work?

Electrical impulses often pass through your circuit breaker without being altered. Nevertheless, if these currents reach unsafe levels, an additional surge of energy will charge a magnet located just below the primary breaker switch. This will cause the switch to trip, resulting in the power being cut off.

Adding a shunt trip breaker provides an additional method to charge the magnets and trip the switches, which makes it possible to turn off the electricity remotely or automatically.

Some of the shunt trips are powered by an external source. When a power surge occurs at this source, a notification is delivered from the shunt trip towards the breaker, which causes the breaker to stop the power automatically.

Connecting to a remote switch that is situated outside the building may also be accomplished with the help of a shunt trip. The current is cut off when the user clicks a button on that switch, which causes an electrical surge to be sent via the shunt trip circuit.

Even though shunt trip breakers are optional in residences, many people put them there out of caution. But, these devices are also often used in businesses that use expensive industrial machinery or electronic wiring that are susceptible to being destroyed in the event of a power surge.

Why Are Shunt Trip Breakers Important?

In an unexpected power outage, you may give yourself an additional level of peace of mind by installing a shunt trip breaker in your house. Because of this, you will not risk injuring yourself or creating any electrical harm.

If there is a fire, one of the most common uses for shunt trips is to switch off any electrical equipment that could be present. For example, when a shunt trip is connected to a fire detection system, the power may be immediately turned off once the smoke detector senses a fire. This allows for eliminating any potential electrical hazards that the fire may cause.

If your smoke detector is connected to your home’s sprinkler system, installing a shunt trip is essential. This device might turn off your power as quickly as the smoke detector triggers the sprinkler, reducing the real damage to your electronic devices.

Where Do People Most Often Use Shunt Trip Breakers?

Shunt trips reduce power through additional sensors, not simply heat activation. For a household electrical system, this circuit breaker attachment is optional.

However, it’s advised for safety. Industrial equipment makes this particularly true. It may also shut off your main breaker manually in an emergency.

Before beginning the implementation of a shunt trip, take into consideration the associated costs and the system. It is possible that the breaker panel and the circuit breakers will need to be replaced if shunt trips are not supported. It’s also possible that a new cable will be required to connect the remote emergency switch to the breaker box.

In most business kitchens, elevators, and offices, shunt trip breakers are an essential safety device. ASME A17.1 is the standard that must be adhered to for elevators and escalators, while ANSI/ASME CSD-1 is the standard that must be attached to commercial kitchens. ASME regulations mandate these controls and safety standards.

Installing A Shunt Trip Accessory to a Breaker

Shunt trip relays can only be installed with breakers and shunts made by the same company. Plus, not all circuit-breaker models can use this part.

Adding a shunt trip connection is easy after establishing that your system is functioning. Watch this video from Schneider Electric for some guidelines:

Each circuit breaker has its instructions, so please follow them carefully. In addition, the make and model of the breaker are relevant.

The most critical step when setting up a sensor is to attach the shunt. If you want to be sure your shunt trip breaker is installed correctly, a shunt trip breaker diagram may be required.

It’s essential to verify the model and manufacturer of your breaker before commencing the installation. The manufacturer in some instances can only install the shunt trip and any other components. If you install your circuit breakers on your own, you might void the warranty. If you want to make alterations, you need either consult the manual or an electrician.

Here are some questions and answers related to the shunt trip breaker:

Does Shunt Trip Breaker Work?

Shunt trip breakers serve a vital purpose in the electrical system as a whole by providing an extra layer of protection for the circuits they are part of. In addition, they cut off electricity in times of crisis to avoid harm and damage to equipment.

What Are 3 Types Of Shunt Trip Breakers?

• Standard breakers 
• Around fault circuit interrupter circuit breakers (GFCIs)
• Arc fault circuit interrupter circuit breakers 

They are the three fundamental circuit breaker types (AFCIs). And standard breakers include both single-pole and double-pole circuit breakers.

Why Is Shunt Used In MCCB?

Molded case circuit breakers (MCCBs) are often employed in electrical distribution systems to prevent overload and short circuits from damaging electrical components. In reaction to a voltage signal from the outside, the shunt release device, a built-in component of MCCB, releases the mechanism.

You have completely got the answer to what a shunt trip breaker is and understand its function. 

A circuit breaker’s shunt trip is an extra layer of safety that may be installed if desired. It’s meant to link up with another sensor. If the sensor is activated, the breaker will trip immediately. You may also set up a remote switch to turn it on and off.

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Erik Watkins

Automotive Mechanic at PowerAll

With 7 years experience in management positions leading automotive mechanics at PowerAll, Erik Watkins wishes to share useful knowledge and information about automotive mechanical equipment.

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Home » circuit breaker » Shunt trip breaker

Shunt Trip Breaker: How It Works to Trip a Circuit Breaker.

While circuit breakers protect appliances from power surges , shunt trip breakers add more protection to our electrical system and equipment .

If you are looking to add additional protection to your home circuit, or even trip your breaker remotely from your comfort zone, why not shop for a shunt trip circuit breaker?

Table of Contents

What is a shunt trip breaker?

A shunt trip device is an optional accessory for breakers that allows you to trip a circuit breaker with a remote, or automatically trip the switch during electrical surge or short circuit .

Shunt trip breakers are mostly used in commercial and industrial applications to enhance safety and protection of electrical appliances.

Types of shunt trip breakers

There are two main types of shunt trip circuit breakers they include.

• Automatic shunt trip breakers: These breakers trip automatically when they detect an electrical fault such as an overcurrent or a fire alarm.
• Manual shunt trip breakers:  These breakers are tripped manually by pressing the remote button.

How the shunt trip circuit breakers work

A shunt trip breaker works like other circuit breakers . However, it comes with a solenoid coil which is connected to a separate control circuit. 

When the control circuit is energized due to electrical fault or overload, it creates a magnetic field around the solenoid coil, which pulls a plunger inward.

This plunger is connected to the tripping mechanism of the circuit breaker. So when it is pulled inward, it trips the breaker and cuts off the power source.

Alternatively, a shunt trip breaker can also work with a remote control so you can trip the breaker remotely when there are electrical hazards

Where are shunt trips required

Shunt trip circuit breakers are used in various applications such as

• Industrial machines to protect it from damages that may arise from electrical faults.
• Fire protection systems to automatically shut off electrical power in the event of a fire outbreak.
• in commercial buildings for additional protection against electrical damage.
• hospitals and healthcare facilities to protect hospital equipment from electrical damage.

Advantages of using a shunt trip breaker

There are several advantages to using a shunt trip devices, these include:

• Enhanced Safety: It provides an additional layer of safety by quickly tripping the main breaker in the event of a fault or overload, preventing potential damage to electrical equipment.
• Remote tripping capability: A shunt trip breaker usually comes with a remote control to enable you to turn off the breaker at any needed time.
• Protection of sensitive equipment: It can help protect sensitive electrical equipment from power surges caused by overload or faults, ensuring the durability of the equipment.

Shunt trip breaker wiring

Before you wire a shunt trip, there are some things you will need to know.

Shunt trip is an accessory and is not compatible with all breakers. Some breakers come with an in-built shunt trip, others require specific models, or to be installed in the factory. Therefore, it is necessary that you evaluate all these before the wiring .

If the breaker is compatible with the shunt trip device, you can then follow this wiring diagram to install it.

Based on the MCCB shunt trip breaker wiring diagram above, the 3-phase 4-wire system from supply is connected to the mccb breaker .

The neutral wire is connected to the shunt coil, and the control line wires to the EPO button. 

Difference between a shunt breaker and a GFCI 

A shunt trip and a ground fault circuit interrupters (GFCI ) are both electrical devices , however, they are designed to work in different ways and for different purposes.

Below are their major differences.

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Shunt Trips – Shunt Trip Circuit Breakers

A shunt trip is an optional accessory device that electricians and/or manufacturers install to a circuit breaker. This is known as a shunt trip circuit breaker. Some circuit breakers allow shunt trip kits to be installable in the field. Others require factory installation when ordering the circuit breaker. You can check your specific type of circuit breaker for the ac and dc shunt trip voltage ratings and how to install these shunt trips .

So How Does a Shunt Trip Breaker Work Exactly?

Well, we know that circuit breakers trip automatically when there’s an electrical surge (current exceeds the specified limit). This is still true for circuit breakers with a shunt trip. The first two contacts of a shunt trip breaker are connected by a metallic strip on a switch and an electromagnet placed underneath the switch. Electricity flows through the metallic strip under normal conditions. But when a surge occurs, the excess power charges the electromagnet which trips the switch and cuts the connection and power. In addition to this normal tripping mechanism, a shunt trip breaker has an external power source that powers it. This external system wires to the electromagnet in the circuit breaker, and this connection can send an electrical signal that can also charge the electromagnet and trip the switch.

Why are Shunt Trip Breakers Important?

Shunt trip breakers essentially provide an off switch remotely or a direct link to a system outside the main breaker. Remote manual switches allow for human control while direct link automatically shuts off the breaker.

An example of a direct link is safety systems such as smoke detectors and fire emergency button/switch are some of examples of an external source. For instance, when smoke triggers a smoke detector, the breaker trips automatically. This cuts the power to electrical equipment at the same time the smoke detector triggers the sprinkler. The immediate break in power minimizes electrical damage, and prevents short circuits and electrocution risk . On the other hand, shunt trip breakers can be remotely shut off, for instance when there is fire damage- someone can turn off power to another building via a remote manual switch. Shunt trip breakers are important safety features in preventing damage to electrical equipment as well as injury to people.

Overall, shunt trip breakers add additional safety features to breakers and ultimately play an important role in the electrical system. They shut off electrical power during emergencies and serve to prevent damage to equipment and injury to people.

What is a Shunt Trip?

How To Connect a ShuntTrip?

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What is a Shunt Trip Breaker?

Home / Tutorials / Electrical Circuit Breakers / Types of Circuit Breakers / Shunt Trip Breaker

A shunt trip breaker, also known as a shunt trip circuit breaker, is a type of electrical circuit breaker that includes a shunt trip coil or solenoid. This coil allows the breaker to be remotely tripped or opened by sending an electrical signal to the coil.

When the coil receives current, it creates a magnetic field that forces the circuit breaker to open, disconnecting the electrical circuit. In this article, we will see in detail its operation and its uses.

How does shunt trip work?

• Normal circuit operation: when the shunt trip circuit breaker is on, and therefore the circuit is operating, current flows through the circuit normally. This means that there are no electrical faults and the circuit is working properly.
• Shunt trip disconnection: to trip a shunt trip circuit breaker, you must trip an external signal, this can be done by several tripping mechanisms: manual push button, remote control, fire alarm system or a programmable logic controller.
• Energization of the shunt trip coil: when the external signal is sent, either by any of the mechanisms explained above, the shunt trip coil is energized with the appropriate voltage. This causes the coil to generate a magnetic field.
• Magnetic field effect: the magnetic field generated by the shunt trip coil exerts a force on a mechanism within the circuit breaker. This force is designed to overcome the mechanism that holds the circuit breaker contacts in the closed position.
• Tripping the circuit breaker: as the magnetic field overcomes the mechanical resistance, it releases the mechanism holding the circuit breaker’s contacts closed. This action causes the circuit breaker to trip or open the electrical circuit, disconnecting power.

Attention: it is important to note that shunt trip breakers not only provide greater flexibility in tripping the circuit breaker, but also offer an additional degree of surge protection. They also offer an additional degree of surge protection.

Wiring a shunt trip circuit breaker

Wiring a shunt trip breaker involves connecting the shunt trip coil, which is responsible for tripping the breaker when activated, to an external control circuit or signal source.

The specific wiring may vary depending on the manufacturer and model of the shunt trip breaker, so it’s essential to refer to the manufacturer’s documentation and follow local electrical codes and regulations. Here are the general steps to wire a shunt trip breaker:

• Take safety precautions: to begin with, you should turn off the main circuit breaker and make sure that no current is flowing through the circuit. It is also advisable to use safety equipment that can protect you from accidents when handling the circuit.
• Locate the shunt trip terminals: almost all models have two terminals for the shunt trip coil (usually labeled “ST” or “Shunt Trip”) and the terminals to be connected to the circuit. See the schematic below for more information.
• Select a control voltage: determine the control voltage for the shunt trip coil. The control voltage is the voltage that activates the shunt trip coil, causing the circuit breaker to trip or open. This voltage should match the specifications of the shunt trip coil.
• Connect the shunt trip coil: the purpose of this step is to connect the shunt trip coil in series with the control voltage source and the ST terminals, in the next step we will go into more detail. You can follow the electrical diagram of the shunt trip coil below.
• Control signal source: the control signal source can be a manual switch, relay, fire alarm system, or any other device that can provide the necessary control voltage. Connect the control signal source to the control voltage terminals you used in the previous step.
• Finish the circuit wiring: next, connect the circuit breaker to the circuit it is intended to protect. And make sure that all wiring is properly secured and insulated to avoid short circuits or electrical hazards.
• Test the shunt trip circuit breaker: finally, it is highly recommended to do some functional tests to verify that the wiring has been done correctly.

Shunt trip breaker wiring diagram

If you don’t understand the electrical diagram and need help wiring the breaker, do not hesitate to ask us in the comments.

Where is shunt trip required?

Shunt trip breakers are commonly used in applications where it is necessary to quickly and remotely disconnect power to a circuit or device for safety or operational reasons.

They are often found in industrial settings, commercial buildings, and other facilities where it is important to have the ability to shut off power from a central location in the event of an electrical emergency or for routine maintenance.

In the following list, we explain some of the most common shunt trip circuit breaker applications:

• Fire safety systems: shunt trip breakers are frequently used in conjunction with fire alarm systems. When a fire alarm is triggered, it sends a signal to the shunt trip coil of the breaker, causing it to open and de-energize circuits to prevent the spread of fire or provide safe egress.
• Elevators: it is very common to use shunt trip circuit breakers in elevator control systems. Since in case of emergency or maintenance, you can disconnect the elevator with the shunt trip remotely.
• Critical equipment: in the case of critical equipment or machinery, it is also very common to find this type of circuit breakers. Because they can be triggered remotely to prevent failures.
• Emergency power off (EPO) systems: EPO systems in data centers and other critical facilities can use shunt trip breakers to rapidly disconnect power in emergency situations.
• Maintenance and service: shunt trip breakers make it easier and safer for maintenance personnel to disconnect power from a central location. Reducing the need to access electrical panels in potentially hazardous conditions.

What is the difference between a shunt trip and a regular breaker?

Throughout the article, we have already mentioned the differences between an electrical shunt trip and a normal circuit breaker. But, as a summary, we are going to clarify it in this section.

The main difference is that a shunt trip breaker includes a shunt trip coil or solenoid, which allows it to be remotely tripped or opened by sending an electrical signal to the coil. Whereas a standard circuit breaker does not have this capability.

In addition, a regular breaker is typically used for basic circuit protection and is commonly found in residential, commercial, and industrial electrical systems. In contrast, a shunt trip breaker is specifically designed for applications that demand the capability to rapidly disconnect power from a central location.

This makes shunt trip breakers more expensive components than standard circuit breakers.

FAQ about shunt trip breakers

By way of conclusion, let’s answer the most common questions related to shunt trip circuit breakers. Without further ado, here we go.

Are shunt trips normally open or closed?

Shunt trips in circuit breakers are typically designed to be in the normally closed position. This means that when the circuit breaker is in its normal, energized state (not tripped), the shunt trip coil is de-energized, and the shunt trip mechanism is in the closed position.

When an external signal is sent to trigger the shunt trip, the coil is energized, creating a magnetic field that opens the shunt trip mechanism and causes the circuit breaker to trip or open the electrical circuit. Once the circuit breaker has tripped, it will remain in the open position until it is manually reset.

Does a shunt trip breaker need a neutral?

Whether a shunt trip breaker requires a neutral connection depends on the specific design and requirements of the breaker. Shunt trip breakers can be designed to work with or without a neutral connection, and this varies from manufacturer to manufacturer.

It’s important to consult the breaker manufacturer’s documentation and specifications for the particular shunt trip breaker you are working with to determine whether it requires a neutral connection.

What is the voltage for shunt trip?

The voltage required for a shunt trip mechanism in a circuit breaker depends on the specific design and model of the breaker. Shunt trip breakers can be designed to operate with various control voltage ratings to suit different applications and electrical systems.

Common control voltage ratings for shunt trip breakers include:

• 24 Volts AC: often used in commercial and industrial applications. This voltage level is commonly available and suitable for many control systems.
• 120 Volts AC: may be used in a wide range of applications and are readily available.
• 240 Volts AC: it is also commonly found in industrial settings.

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• Electrical , How To & Guides

Shunt Trip Breaker

• May 20, 2024
• By Leela Prasad

A shunt trip can be used to turn off the circuit breaker remotely. When activated, a shunt release quickly engages the circuit breaker mechanism, allowing for a quick separation from the power supply. The functions of a primary circuit breaker and a shunt trip accessory are combined in the shunt trip breaker. This is installed on the primary breaker to protect your electrical system.

Also, it improves the security of your electrical system by either manually or automatically shutting down the power supply to your circuit. If a disaster strikes your home, you can rest assured that a circuit breaker will protect against short circuits and electrical damage.

Shunt Trip Breaker and Its Functioning?

A PLC or any other relay can activate this device, an optional addition to a circuit breaker, to provide protection. When there is an electrical surge, circuit breakers trip automatically (current exceeds its given specified limit). A PLC or any other relay can activate this device, an optional addition to a circuit breaker, to provide protection. A metallic strip on a switch & an electromagnet installed beneath the switch connects the first two contacts of a shunt trip breaker.

Meanwhile, the wiring for the shunt trip breaker consists of two wires. One is grounded, and the other is linked to a control system. A control system can be linked to either a sensor or a manual switch. An external source powers some shunt trips.

Where are Shunt Trip Breakers Frequently Used?

In the case of a fire, shunt trips are routinely utilized to turn off electrical equipment. When a smoke detector is wired to a shunt trip, electricity can be immediately shut off once it emits an alarm, reducing the risk of electrical shock from the fire.

Due to its necessity, this shunt trip breaker is frequently seen in commercial kitchens, elevators, and offices. Commercial kitchens use ANSI/ASME CSD-1 for this equipment, while elevators and escalators use ASME A17.1.

How to Connect the Shunt Trip Accessory to the Breaker?

Install the device in the proper location on the circuit breaker. Examine your circuit breakers to see if you have the exact specifications for each one. Connect the two terminals to their rated voltage after the unit has been properly installed within the circuit breaker, with the switch leg connected to the power source and the other leg connected to the neutral (in case you are using an L-N power source).

Any line can be connected to the switch leg to provide line-to-line service. However, the most important part of any installation is connecting the shunt to your sensor.

Importance of Shunt Trip Breakers

When smoke triggers a smoke alarm, the breaker trips automatically. As a result, the smoke alarm triggers the sprinkler while the electricity to the electrical devices is turned off. The quick loss of electricity minimizes electrical damage while also lowering the chance of short circuits and electrocution.

The electricity can be turned off remotely using a manual switch if a fire has damaged a structure. Shunt trip breakers are essential safety components that protect against human risk and electrical equipment damage.

Overall, shunt trip breakers increase the safety of breakers. They cut the power during an emergency to prevent damage to equipment and injury to people.

A shunt trip is an optional circuit breaker accessory that provides additional protection for your system. It is designed to be linked to a secondary sensor. If the sensor is triggered, the breaker is automatically tripped. It is also possible to activate it by installing a remote switch.

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How does a shunt trip work to trip a circuit breaker.

26 May 2022