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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.  Detailed Guide. There is electrical system safety is the main parameter for the power system/ The main element that ensures the safety of electrical installation is the shunt trip breaker.  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 fo 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:

 Main Contacts

This part of the shunt trip breaker is employed for carrying and interruption of current flow. Their main function s to control  high current  and make reliable connections

 Shunt Coil

The shunt coil is an electromagnet that gets an electrical signal for breaker tripping. It produces a magentic field when gets energized releases the latch and starts the tripping process

 Trip Mechanism

it helps to disconnect the mechanical circuit when the breaker trips. it has a latch that helps contact during normal working but releases due to trip signal.

Control Wiring

The control wiring triggers the device remotely or control panels.  It works for remote activation of the shunt trip to provide the protection layers

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. In 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 break 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

• Commercial buildings
• Hospitals and healthcare facilities
• Data centers
• Industrial facilities
• Laboratories
• Hotels and resorts

 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.

 Troubleshooting of Shunt Trip Breakers

• Regular inspection of the breaker helps to find the symbols of damage or wear.
• Perform differnt electrical tests to check the it is working accurately or not
• Make sure there are no dust particles on the breaker so clean it regularly
• Make it properly lubricated
• After finding the faults solve it

 Comparison with Other Circuit Protection Devices

Shunt trip breakers vs. standard circuit breakers, shunt trip breakers vs. ground fault circuit interrupters (gfcis), shunt trip breakers vs. arc fault circuit interrupters (afcis), how to choose right shunt trip breaker.

• Choose according to the voltage rating of your circuit
• it has compatibility with  electrical panels and other protection devices used in circuitry

Shunt trip breaker wiring

Its wiring is very simple and easy. The shunt coil has two terminals one used for voltage supply and the other for neutral. The supply is about 120 volts AC and the neutral is connected to the neutral point of the breaker

The shunt coil is attached in a series combination with the push button. When we press the button it closes teh circuit to the shunt coil that trips the breaker. It is good to check that the shunt coil is rated for a similar voltage to the breaker.  If the shunt coil does not have the same rating it can be damaged

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?

A shunt trip breaker controlled by a small current from some distance. It is best for uses where it has the ability to off  power to circuitry from distant points, like fire alarm systems

How is a shunt trip breaker wiring?

The shunt trip terminals are connected to the top and lower parts of the circuitry breaker. The small-size wire is used for wiring the shunt trip breaker between the shunt trip points and the remote source of supply. The power source can be battery relays

What is the purpose of a shunt with a relay?

The shut relay provided the remote tripping for the breaker. The shunt low resistance conductor is connected between the circuit breaker and relay. When current passes through the shunt, it makes a magnetic field that functions as the relay. The relay close contacts that trip the breaker.

What is shunt trip and under voltage?

Shunt trip and under voltage are differnt terms used for the differnt tripping methods of the breaker.  Shunt trip use a shunt to have remote tripping. Under voltage is tripping off the circuit breaker when voltage loses less than a certain value

Where is shunt trip used?

• Fire alarm systems
•  Security system
• Power distribution
• Industrial control systems

What is the difference between shunt and resistance?

The main difference between a resistor and a shunt is the temperature coefficient of thermal EMF . For resistors thermal EMF is not considered but for shunt resistors considered, based on temperature values two different conductive materials generate variable voltage

What is the purpose of a shunt breaker?

The shunt trip breaker is an optional device for a circuit breaker that helps to trip the breaker remotely or automatically when a surge exists, any damage, or emergencies.

Is the shunt resistor AC or DC?

Shunt resistors can be used for both AC and DC circuits. Though the value of the shunt resistor will be different from ac and DC circuits

Where are shunt trip breakers required?

If you are thinking that if shunt trip breaker is needed find that it is required in an electrical system where is a need for fast and easily shut-off power in case of a fault like fire.

Why is it called a shunt resistor?

The term shunt originated from the Latin word “scindere”, which means to split.  A shunt resistor is used for spiting current in circuitry.

Why is low resistance called shunt?

When the resistor is connected with another resistor of low values then the equivalent resistance is lower than a single resistor that shunts the resistor.

What is another name for a shunt resistor?

it also called a shunt resistor is a current-dividing resistor.

What is 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 cut-off switch opens the solenoid coil electrical circuit if the breaker contact is opened. The solenoid coil so carries momentary current and is not rated for continuous duty. This process needs an external control supply or auxiliary supply for operation.

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 shunt close, share this:.

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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 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.

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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 Breaker: Function, Applications, and Benefits

Introduction.

In the realm of electrical distribution systems, safety and control are paramount. Shunt trip breakers, a specialized type of circuit breaker, play a crucial role in enhancing safety and efficiency in various applications. This article delves into the mechanics, applications, and benefits of shunt trip breakers, shedding light on their significance in modern electrical systems.

What is a Shunt Trip Breaker?

A shunt trip breaker is a type of circuit breaker that features an additional accessory known as a shunt trip coil. Unlike a standard circuit breaker, a shunt trip breaker can be remotely tripped open using an external control signal. This control signal energizes the shunt trip coil, causing the circuit breaker to trip and open the electrical circuit.

Functionality of Shunt Trip Breaker

A shunt trip breaker is a type of circuit breaker commonly used in electrical distribution systems. It includes an additional feature called a shunt trip, which allows for remote tripping of the breaker under specific conditions. Here’s how it works:

• Basic Circuit Protection : Like a standard circuit breaker, a shunt trip breaker is designed to protect electrical circuits from overload or short circuit conditions. It interrupts the flow of electricity when it detects an excessive current, preventing damage to the electrical system and reducing the risk of fire or electrical hazards.
• Shunt Trip Mechanism : The shunt trip mechanism is an additional component installed within the circuit breaker. It consists of a solenoid coil that, when energized, creates a magnetic field. This magnetic field pulls down a latch or mechanism within the circuit breaker, causing it to trip and open the circuit.
• Remote Tripping : The key functionality of a shunt trip breaker is its ability to be remotely tripped. This is achieved by providing an external control signal to energize the solenoid coil of the shunt trip mechanism. The control signal can be generated by various means such as a manual switch, a relay, a control panel, or an automated system like a building management system (BMS) or a fire alarm system.
• Emergency Shutdown : In case of emergencies, such as fire or other hazardous situations, the breaker can be remotely tripped to de-energize certain circuits or equipment.
• Security : In sensitive areas or facilities, shunt trip breakers can be integrated into security systems to remotely disable power in certain areas.
• Maintenance : They can be used to facilitate maintenance procedures by providing a means to de-energize specific circuits or equipment remotely.
• Integration with Other Systems : Shunt trip breakers can be integrated with other systems such as fire alarm systems, security systems, or industrial automation systems to provide coordinated responses to various events.
• Resetting : After the shunt trip feature is activated and the breaker trips, it typically needs to be manually reset. This ensures that power is not automatically restored after the fault condition is cleared, allowing for inspection and maintenance before restoring power.

In summary, a shunt trip breaker combines the functions of a standard circuit breaker with the added capability of remote tripping, making it suitable for a wide range of applications where remote control and safety are paramount.

Applications of Shunt Trip Breakers

Shunt trip breakers find various applications across different industries and environments where remote tripping capability is essential for safety, security, or operational reasons. Here are some common applications:

• Commercial Buildings : In commercial buildings, shunt trip breakers can be used to integrate with fire alarm systems. In the event of a fire alarm activation, the breaker can be remotely tripped to de-energize specific circuits or equipment, such as HVAC systems, elevators, or lighting, to facilitate safe evacuation or firefighting operations.
• Industrial Facilities : Shunt trip breakers are widely used in industrial facilities for emergency shutdown procedures. They can be integrated with safety systems to automatically trip certain circuits or equipment in the event of hazardous conditions, such as the detection of gas leaks, chemical spills, or other emergencies.
• Data Centers : In data centers, where uninterrupted power supply is critical, shunt trip breakers can be employed as part of the facility’s emergency power-off (EPO) system. In case of a severe malfunction or security breach, the EPO system can remotely trip the breakers to shut down power to all equipment and prevent potential damage to sensitive IT infrastructure.
• Healthcare Facilities : Shunt trip breakers are used in healthcare facilities to support life safety systems. They can be integrated with emergency response systems to deactivate non-critical equipment and ensure power availability for essential medical devices, lighting, and communication systems during emergencies or power outages.
• Laboratories : Laboratories often utilize shunt trip breakers to ensure the safety of personnel and prevent accidents. Breakers can be integrated with gas detection systems, chemical spill sensors, or other safety devices to automatically disconnect power to hazardous equipment or areas in the event of a malfunction or emergency.
• Military Installations : In military installations, shunt trip breakers are employed to enhance security measures. They can be integrated into perimeter security systems or command and control centers to remotely cut power to specific areas or equipment in response to security threats or breaches.
• Critical Infrastructure : Shunt trip breakers are deployed in critical infrastructure facilities such as power plants, water treatment plants, and transportation hubs to support emergency response protocols. They provide a means to quickly isolate and de-energize critical systems or equipment during emergencies, natural disasters, or security incidents.

Overall, shunt trip breakers play a vital role in enhancing safety, security, and operational efficiency across various industries and applications where remote tripping capability is essential.

Benefits of Shunt Trip Breakers

Shunt trip breakers offer several benefits across various applications due to their remote tripping capability and integration with safety and security systems. Some of the key benefits include:

• Enhanced Safety : Shunt trip breakers improve safety by providing a means to remotely de-energize specific circuits or equipment in emergencies. This helps prevent accidents, mitigate risks, and protect personnel, property, and the environment from potential hazards.
• Quick Response : The remote tripping feature allows for rapid response to emergencies, such as fire alarms, gas leaks, or security breaches. Breakers can be tripped instantly to cut power to critical systems or equipment, facilitating prompt evacuation, containment, or mitigation measures.
• Customizable Control : Shunt trip breakers offer flexibility in control and operation. They can be integrated with various control systems, including fire alarm systems, security systems, or building management systems, allowing for customized programming and coordination of response actions based on specific requirements and scenarios.
• Reduced Downtime : In industrial and commercial environments, shunt trip breakers help minimize downtime by enabling targeted shutdowns of equipment or processes during maintenance, repairs, or troubleshooting. This improves operational efficiency and reduces the impact of disruptions on productivity and revenue generation.
• Enhanced Security : Shunt trip breakers enhance security measures by providing a means to remotely disable power to specific areas or equipment in response to security threats or breaches. They can be integrated with access control systems, surveillance systems, or perimeter security systems to bolster overall site security and resilience.
• Compliance with Regulations : Shunt trip breakers help organizations comply with safety and regulatory requirements. By incorporating remote tripping capability into their electrical systems, facilities can meet standards and guidelines related to fire safety, emergency preparedness, environmental protection, and occupational health and safety.
• Protection of Critical Infrastructure : Shunt trip breakers play a crucial role in protecting critical infrastructure facilities, such as power plants, water treatment facilities, and transportation hubs, from disruptions and threats. They provide a proactive means to isolate and secure essential systems or equipment during emergencies or security incidents.
• Remote Monitoring and Management : Some shunt trip breakers offer remote monitoring and management capabilities, allowing operators to remotely monitor the status and condition of circuits, troubleshoot issues, and perform maintenance tasks without the need for physical access to the breaker panel.

Overall, shunt trip breakers offer significant advantages in terms of safety, security, operational efficiency, and regulatory compliance, making them indispensable components in a wide range of applications and industries.

Installation and Maintenance Considerations

When considering the installation and maintenance of shunt trip breakers, several factors should be taken into account to ensure proper functioning, reliability, and safety:

• Installation by Qualified Personnel : Shunt trip breakers should be installed by qualified electricians or technicians who have the necessary expertise and training in electrical systems and safety procedures. Improper installation can lead to malfunctions, safety hazards, or damage to equipment.
• Compatibility with Existing Systems : Before installation, ensure that the shunt trip breaker is compatible with the existing electrical system, including voltage ratings, current capacities, and mounting configurations. Compatibility issues could result in compatibility issues or compromised performance.
• Proper Wiring and Connections : Carefully follow the manufacturer’s instructions and wiring diagrams during installation to ensure correct wiring and connections. Improper wiring can cause electrical faults, overheating, or tripping issues. Use appropriate wiring methods, connectors, and protective devices as per electrical codes and standards.
• Integration with Control Systems : If the shunt trip breaker is being integrated with control systems such as fire alarms, security systems, or building management systems, ensure proper communication and compatibility between the breaker and the control system components. Test the integration thoroughly to verify functionality and reliability.
• Remote Tripping Mechanism : Verify the proper installation and operation of the remote tripping mechanism, including the control wiring, switches, relays, or other devices used to trigger the shunt trip function remotely. Ensure that the remote tripping mechanism is accessible and functional as per operational requirements.
• Testing and Commissioning : After installation, conduct thorough testing and commissioning of the shunt trip breaker to verify its performance and functionality under normal and emergency conditions. Test the remote tripping function, overload and short-circuit protection, and coordination with other protective devices.
• Maintenance Schedule : Develop a regular maintenance schedule for the shunt trip breaker as part of the overall maintenance plan for the electrical system. Follow the manufacturer’s recommendations for inspection, testing, and servicing intervals. Routine maintenance tasks may include visual inspections, cleaning, torque checks, and functional testing.
• Training for Personnel : Provide training to personnel responsible for operating, maintaining, and troubleshooting the shunt trip breaker. Ensure that they are familiar with the proper procedures, safety precautions, and protocols for handling the breaker, including emergency response procedures.
• Documentation and Records : Maintain comprehensive documentation and records of the installation, maintenance, testing, and any modifications or repairs performed on the shunt trip breaker. This information is essential for compliance, troubleshooting, and historical reference.

By adhering to these installation and maintenance considerations, organizations can ensure the reliable operation, safety, and effectiveness of shunt trip breakers in their electrical systems. Regular maintenance and proper training are key to maximizing the lifespan and performance of these critical components.

Shunt Trip Breakers FAQS

What is a shunt trip breaker.

A shunt trip breaker is a type of circuit breaker equipped with an additional accessory called a shunt trip coil. This coil allows the breaker to be remotely tripped open using a control signal, providing an extra layer of safety and control in various applications.

How does a shunt trip breaker work?

A shunt trip breaker operates by using an electromagnetic coil, the shunt trip coil, that is connected in parallel with the circuit breaker’s trip coil. When a control signal is applied, the shunt trip coil generates a magnetic field that interacts with the trip mechanism of the breaker, causing it to trip and open the circuit.

What are the applications of shunt trip breakers?

Shunt trip breakers are used in a variety of applications, including emergency shutdowns, security systems, elevators, HVAC systems, and laboratories. They are particularly useful in situations where rapid circuit interruption is necessary for safety reasons or to prevent equipment damage.

How are shunt trip breakers activated?

Shunt trip breakers can be activated manually by using a switch, automatically through a control system, or by specific triggers such as smoke detectors, temperature sensors, pressure sensors, or intrusion detection systems.

What is the main benefit of using shunt trip breakers?

The primary benefit of shunt trip breakers is enhanced safety. Their ability to be remotely tripped in critical situations provides a quick and effective way to disconnect power and mitigate potential hazards, preventing accidents and minimizing damage.

Can shunt trip breakers be reset after tripping?

Yes, after a shunt trip breaker has been tripped and the triggering condition is resolved, it can generally be reset manually. The process of resetting may involve toggling the breaker back to the “ON” position.

How are shunt trip breakers different from standard circuit breakers?

Standard circuit breakers are manually operated and do not have the capability to be remotely tripped. Shunt trip breakers, on the other hand, can be opened remotely through the activation of the shunt trip coil.

Are shunt trip breakers commonly used in residential settings?

Shunt trip breakers are more commonly found in commercial, industrial, and specialized settings rather than residential environments. They are often used in applications where safety and rapid circuit interruption are critical.

Can shunt trip breakers be retrofitted into existing systems?

In many cases, shunt trip breakers can be retrofitted into existing electrical systems, depending on the design and compatibility of the system. However, it’s important to consult with a qualified electrician to ensure proper installation and compatibility.

How do I choose the right shunt trip breaker for my application?

When selecting a shunt trip breaker, consider factors such as the application, voltage rating, current rating, coordination with other protective devices, and the specific triggers or control signals required for activation. It’s advisable to consult with electrical professionals or manufacturers to make an informed decision.

Shunt trip breakers stand as an excellent example of how technology enhances safety and control in electrical systems. Their ability to remotely trip circuits in emergency situations, security concerns, or operational anomalies is a testament to the progress in electrical engineering. As technology continues to evolve, shunt trip breakers will likely remain a vital component in maintaining the safety and reliability of various applications across industries.

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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.

When to call an electrician

If you have any issues with your electrical system, or went us to help you with a quotation or any wiring advice, contact us as we are here for you.

About mariaelectricals

Hi, I am Emmanuel Nwankwo, a commercial electrician and the founder of mariaelectricals.com . I established this blog to share my decades of work experience in electrical installations and repairs.

What is a Shunt Trip?

How To Connect a ShuntTrip?

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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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