dc shunt trip coil

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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.

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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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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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Home » News & Blog » Using DC Current Shunts

Using DC Current Shunts

Posted February 9, 2021 by Weschler Instruments

Most shunts are made from manganin, an alloy that is 84% copper, 12% magnesium and 4% nickel. This material has an extremely low temperature coefficient of resistance, only 0.0015%/degC (15ppm/°C). For comparison, the TC of copper is 0.4%/°C. Shunts are specified for a 50mV, 75mV or 100mV drop at full-scale current. 50mV shunts are generally preferred since they have lower power dissipation and therefore less self-heating. For continuous operation, manufacturers generally recommend that shunts be limited to less than 2/3 of the rated current.

For stable operation, the temperature at the center of the manganin blades should be less than 80°C. At temperatures above 80°C, the manufacturer may specify a derating factor to permit operation at a lower current level. A temperature above 140°C will cause a permanent change in manganin resistance, so 125°C is generally considered the maximum safe limit. Proper mounting helps minimize the temperature rise. To facilitate convection cooling, the shunt should be mounted in an open space with blades in a vertical position. If the shunt is in a cabinet or restricted space, forced air cooling may be needed. For shunts with the same amp rating, a larger size model will better handle heat dissipation and overloads.

Many meters used in shunt applications are scaled to display amps, although they are measuring voltage. A ‘shunt-rated’ DC ammeter is a voltmeter calibrated and scaled for a particular shunt current and full-scale voltage drop (e.g. 100A, 50mV). A 100 amp, 50mV shunt has a resistance of 0.0005 ohms (500μΩ). A digital meter used to monitor voltage drop across a shunt typically has an input resistance of 1MΩ or greater. Current flow in the meter leads is negligible, so the meter ‘load’ does not affect the measurement accuracy. For analog meters, the current flowing in the meter leads is small, but not negligible. The meter’s input resistance is usually between 6.5 and 50 ohms, depending on model.

In addition to analog and digital meters, other instrumentation can be used to monitor voltage across a DC shunt. A signal conditioner is sometimes employed to convert the millivolt signal for transmission to a remote location or interface to process control equipment. A typical example changes 0-100mV into a 4-20mA loop current. One benefit of this scheme: a broken connection can be easily detected. A recorder or data logger will capture and store readings for future examination. In applications where the current changes faster than can be seen on an analog or digital meter, a data logger (or meter with internal data logging) can sample at a higher rate.

DC current shunts provide a simple means to monitor high current circuits. Various instruments are available to measure the shunt output. Careful consideration of a few key factors will lead to a successful installation.

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• 2C12790G01 - CH 125VAC/DC SHUNT TRIP COIL ASSEMBLY

Product details

• Is Discontinued By Manufacturer ‏ : ‎ No
• Product Dimensions ‏ : ‎ 6 x 6 x 6 inches; 2 Pounds
• Date First Available ‏ : ‎ May 6, 2016
• Manufacturer ‏ : ‎ Cutler Hammer
• ASIN ‏ : ‎ B01FG30WJO

Product Description

2C12790G01 Cutler Hammer Shunt Trip 110/127 VAC 110/125 VDC

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