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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

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.

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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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• 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:

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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.

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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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• 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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Understanding Shunt Trip: What it is, How to Use it & Troubleshooting Tips

By Happy Sharer

Introduction

A shunt trip is an electrical circuit designed to shut down equipment or activate alarms in the event of an emergency. It’s an important safety feature that helps protect people and property from potential harm. In this article, we’ll explore what a shunt trip is, how it works, and the advantages of installing one.

Exploring the Basics of a Shunt Trip

A shunt trip is a type of circuit breaker, which is an electrical device designed to shut off the power supply when a fault is detected. The circuit breaker is connected to a sensing device, like a pressure switch or smoke detector, which detects any changes in the environment. If a hazard is detected, the circuit breaker will be triggered, shutting off the power supply.

The shunt trip circuit is made up of three components: a sensing device, a control relay, and a circuit breaker. The sensing device is installed near the equipment being monitored and detects any changes in the environment. When the sensing device detects a hazardous condition, it sends a signal to the control relay, which then activates the circuit breaker, stopping the flow of electricity.

The shunt trip circuit is an important safety feature that can help prevent serious accidents and injuries. According to a study by the National Institute for Occupational Safety and Health (NIOSH), “the use of shunt trip circuit breakers can help reduce the risk of electrical shock and other hazards in the workplace.”

The Advantages of Installing a Shunt Trip

Installing a shunt trip circuit can provide numerous benefits, including improved safety, increased efficiency, and cost savings. Here are some of the most common uses for a shunt trip circuit:

• Safety: A shunt trip circuit can be used to shut down equipment in the event of an emergency, helping to prevent serious accidents and injuries.
• Efficiency: By automatically shutting down equipment when a hazardous condition is detected, a shunt trip circuit can help reduce downtime and improve efficiency.
• Cost Savings: Installing a shunt trip circuit can help save money by reducing the need for manual inspections and maintenance.

There are several different types of shunt trips available, depending on the application. Common types include magnetic shunt trips, thermal overloads, and ground fault circuit interrupters (GFCIs). Understanding the differences between these types of shunt trips can help you choose the right one for your needs.

Troubleshooting a Shunt Trip Circuit

When troubleshooting a shunt trip circuit, it’s important to identify any potential faults or issues. Common problems with shunt trip circuits include faulty wiring, incorrect settings, and damaged components. Here are some tips for troubleshooting a shunt trip circuit:

• Check the Wiring: Check all the wiring connections to make sure they are secure and in good condition.
• Check the Settings: Make sure the shunt trip circuit is set correctly according to the manufacturer’s instructions.
• Check the Components: Make sure all components are in good working order and replace any damaged parts.

A shunt trip is an important safety feature that can help protect people and property from potential harm. It’s a type of circuit breaker that can be used to shut down equipment or activate alarms in the event of an emergency. Installing a shunt trip circuit can provide numerous benefits, including improved safety, increased efficiency, and cost savings. When troubleshooting a shunt trip circuit, it’s important to check the wiring, settings, and components to identify any potential faults or issues.

In summary, a shunt trip is a valuable safety feature that can help reduce the risk of accidents and injuries. Understanding how it works and how to troubleshoot it can help ensure it functions properly and provides maximum protection.

(Note: Is this article not meeting your expectations? Do you have knowledge or insights to share? Unlock new opportunities and expand your reach by joining our authors team. Click Registration to join us and share your expertise with our readers.)

Hi, I'm Happy Sharer and I love sharing interesting and useful knowledge with others. I have a passion for learning and enjoy explaining complex concepts in a simple way.

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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.

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We recommend the use of a Circuit Breaker and Shunt Trip to best protect the batteries . Both are needed as we trigger the shunt trip that manually trips the circuit breaker.

Below are examples and generally available worldwide and suitable for a 48V system, but there are many other options.

Specific choices of circuit breakers and responsibility for the choice are yours and should be made to suit your requirements.

As rules and product availability vary from country to country and even state to state within some countries, you should consult with someone qualified locally for a recommendation of what will suit your circumstances.

¶ What it does is disconnect the battery pack to prevent:

• Overcharging
• Overdischarge

¶ Control Logic

• The first level of control is the remote logic.  This is only in place with a connected inverter or charger.  It uses overall pack voltage.  These are the narrowest limits.
• The second level of control is using the charging and discharging control logic.  This aims to pick up issues such as if a cell was high or low but overall pack voltage is still within limits.  It would stop charging or go into Limited mode so that cell isn't overcharged or depleted.  Expansion settings allow you to trigger a contactor or similar if you don't have a CANbus connection to gain this control level.  These limits are a bit wider than the remote settings but narrower than critical settings.
• The circuit breaker is the last level.  It uses critical settings .  These are the widest limits when you need to just cut the charging or load if the narrower limits haven't worked.

¶ Related Links

• Control Logic
• Critical Settings
• Charging Settings

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

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