shunt trip breaker vs contactor

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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.

Contactor VS Circuit Breaker: What’s The Difference

Table of Contents

If you want to know about  circuit breaker  and contactor ,  then you must understand the primary difference between a circuit breaker and a contactor is that the contactor is controlled with an electrical switch that connects the load with the power.

In the case of the circuit breaker, this is an electric protective device that disconnects the load from the power source when a fault occurs. Let’s know more about the interesting topic of  contactor vs circuit breaker .

Definition and Basic Information of Circuit Breaker and Contactor

Circuit breaker.

There are different types of circuit breakers  and they are different in their construction. However, the overall and the common matter of a circuit breaker is that it consists of multiple movable and fixed contacts similar to an electrical contactor, but they usually contact physically through pneumatic and mechanical pressure or electromagnetic attachment.

The circuit breaker has voltage and current sensing circuits which is missing in a contactor. This is because a circuit breaker is operated automatically, and it works all by itself when a fault appears.

What is a contactor? The contactor is simple than the circuit breaker and has several contacts. Many of them are movable then others are fixed, and this is to ensure the service when electromagnet attracts it. A contactor has an electromagnetic coil to operate at a low current and voltage. So, when the control is applied to the coil, the movable parts touch the fixed contacts and attach the load with the power source.

Working principle of Circuit Breaker and Contactor

Working principle of circuit breakers.

The  working principle of the circuit breaker   is made with two metallic contacts, fixed and moving. Other than this it has an operating coil. In a normal condition, in the case of closed circuits, the contacts touch each other and allow the flow of current. The moving contacts are put together with the help of mechanical pressure or through compressed air. For instance, the pressure on the moving contacts is gained through the energy stored in the mechanism.

When an overload happens, the coil is charged with the potential energy, and a plunger is used to the system of the moving contacts. This reassesses the stored energy and separates the contacts. After the separation, the circuits inside the breaker open and interrupt the flow of electric current. This protects the system from damage.

Furthermore, it’s crucial to understand the method of arc. The moment current passes through a gap, plasma discharges are known as the arc. This can also happen in the electrical wiring of a house, but it will occur during circuit breaker operation. This can damage the system and can cause a fire if the arc is not managed. So, the mechanism of a circuit breaker is to control and prevent damages as much as possible.

Working Principle of Contactors

The  working principle of a contactor  happens through an electromagnetic field that generates the current flow where the coil attaches. Then the moving contact is pushed in the front, then the force creates with the electromagnet, which holds the fixed and moving contacts together.

For the de-energizing, the coil of the contactor returns to the electromagnetic coil and the previous position, and there is no current flow in the circuit. If AC energized the contactor, then a small part of the coil is the shaded one. In this place, the magnetic flux in the center is delayed. This is an average effect that prevents the buzzing of the core on the twice line.

This also consists of internal tipping sections, that ensure fast action so the contactors can close and open quickly. From the source of the supply that gives the switch, that is the moment the switch is turned on the electricity flows through the coil of the contactor and attracts the moving center. The contactor attached with the moving center closes and the motor starts immediately. When the switch is turned off, the electromagnetic field returns to the previous position and the power supply is cut off instantly.

The Operational Differences Between Circuit Breaker and Contactor

There are functional differences between these two electrical systems. The difference between contactor and circuit breaker is a popular topic among engineers and students. Let’s explore the differences between the two.

Electrical Contactor

The primary  function of contactor  is to attach the load with the current flow, and this should be of high voltage. The contactor also has benefits, as it is constructed to release and close quickly. The moving contactor is required when the control is needed or for a transfer to high and low voltage.

Circuit Breaker

On the other hand, the  function of the circuit breaker  is automated as it disconnects the current supply whenever a short circuit or overload occurs. Experts can manually work with a circuit breaker, and they connect it to the contacts for electric supply. Thus, in the normal phase, this system works as a switch.

Other Important Differences Between Contactor and Circuit Breaker:

• An electronic contactor is a simple switching device, whereas the circuit breaker is a protective system. The primary function of a contactor is controlling the power. A circuit breaker does the protecting.
• Contactor works under normal situations. But a circuit breaker works only when a fault occurs.
• Medium voltage is required for a contactor. On the other hand, a circuit breaker requires high voltage.
• Using a contactor means there will be more sparkling and flashing. With the other, there’s no chance of that.
• A contactor isn’t made for automation. But the other one can start and stop automatically whenever a fault appears in the system.
• The electromagnetism system works to build a connection between the movable and fixed contacts. In the case of circuit breaker mechanical and electromagnetism, pressure is required to build the connection between movable and fixed contacts.
• Contactor has no arrangement for the quenching of ARC. But current and high voltage circuit breakers have the same facility.
• There is no electric voltage sensing system in a contactor. Whereas circuit breaker has current and voltage sensing parts. For more information, you can contact  CHINT .

Check out this discussion on  contactor vs circuit breaker  in this article, and you will understand the functions of the two systems, and how they are used. For more information, ask a reputed electrical mechanic.

Recommend Reading

How to Replace a Circuit Breaker

Table of Contents Do you want to know how to replace a circuit breaker? Are you looking for some easy steps for circuit breaker replacement? If yes,

Circuit Breaker – Working Principle, Types and Safety Tips

Either at home or in business, many times there are sudden electrical failures that if they are not addressed quickly, they can cause significant damage

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What is a Shunt Trip?

How To Connect a ShuntTrip?

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Shunt Trips – Shunt Trip Circuit Breakers

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

So How Does a Shunt Trip Breaker Work Exactly?

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

Why are Shunt Trip Breakers Important?

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

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

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

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What Is A Shunt Trip Breaker & How Does It Work? 2023 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. 2023 Detailed Guide. There is electrical system safety is the main parameter for the power system/ The main element hat 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?

The shunt trip breaker is the replacement of circuit breakers which helps to trip breaker from some distance automatically when the urge comes and prevent any harmful effect or damage of any fault. There are two main types of shunt trip breakers first one is automatic and the second is manual

• Automatic shunt trip breakers come with a sensor that helps the detection of faults such as overvoltage and overcurrent and its signal is given to the shunt trip breaker that trips the circuit
• Manual shunt trip breakers are connected with a remote switch for tripping the breaker at some distance. it is beneficial to shut off the power supply at a distance such as a fire alarm and security system

Shunt trip breakers work with the use of small currents from shunt trip terminals. The field created by the current trips the breaker.

 How Does a Shunt Trip Breaker Work?

A shunt trip breaker is tripped from some distance with the use of tripped to its shunt coil. it automatically trips the breaker in case of any fault like an overload. The shunt breaker works with the use of a solenoid to mechanically trip the breaker.  it has a coil that energizes and creates a magnetic field. Fields make attraction with plungers and trip breakers that open the contacts and restrict the current flow.

Shunt trip breakers are preferred for distance breaker trips. such as those used in industrial locations where high chances of fire. They also used in buildings to off the power supply at distant locations

 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:

 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

 Installation and Wiring of a Shunt Trip Breaker

To install a shunt trip breaker, follow these instructions.

• First of all, off the power supply
• Select the accurate location for the shunt trip breaker in the panel
• Connect the breaker  with panel bus bars and make its connections accurately
• Connect control wiring from the shunt trip breaker with the remote triggering device
• Make  grounding and electric connection of different points
• Finally, ON the main power supply and test the shunt trip breaker to have the accurate function

 Applications of Shunt Trip Breakers

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

Benefits and Advantages of Shunt Trip Breakers

• it has protection for remote sources to disconnect power during any fault.
• its high-speed response time helps to avoid electrical hazard
• it can be easily integrated with older electrical systems.
• it also has compatibility with different devices used in circuitry like ground fault circuit interrupters and arc fault circuit interrupters

Maintenance and 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 fautls 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), tips for choosing the 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

Why Are Shunt Trip Breakers Important?

•  safety: Shunt trip breakers are helpful for minimizing the effect of electric fires and damage with the use of automatic trip of the breaker. it is best for avoiding the risk of fire or damaging
• Remote control: These breakers trip circuits from distant points, so not accessible points can be controlled through this device
• Flexibility: it is used in commercial, industrial,  and residential settings.

Where Do People Most Often Use Shunt Trip Breakers? :

• Industries: in industries, there is a high chance of fire so it is used there. They can be used for a tripping breaker if there are overloading conditions
• Commercial buildings: it is used in buildings to power off at some points where faults exist. Like, they used to off the power to a fire alarm or data center
• Residential applications: it is also used in homes  to trip breakers if there is a power surge or fire alarm triggered

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

How Many Outlets on a 15 Amp Circuit Breaker?

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

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. 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 magentic 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

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

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

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Shunt Trip Parts In Stock for Remote Tripping Your Circuit Breakers

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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