shunt trip isolator

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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:

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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 trip safety switches

Eaton’s shunt trip safety switches, unique to the market, provide remote switching and a visible means of disconnection for commercial and industrial applications. In addition, the shunt trip technology enhances safety by providing the means to open a safety switch electronically. This product line provides additional code-compliant solutions with optional protection schemes such as arc energy reduction (NEC 240.67) and ground fault (including 480 VAC and 1200A service entrance applications).

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Core features

• Standard heavy-duty safety switch design with integrated shunt trip module
• Integral arc energy reduction system available (NEC 240.67)
• Integral ground fault protection available for 480 VAC service entrance applications (NEC 230.95)
• Works with emergency-stop push buttons and other remote signalling means to quickly disconnect power from equipment
• Provides a safety-switch solution for oil and gas, industrial plants, utilities, commercial construction and water and wastewater treatment applications
• Includes two, three and four-pole configurations for maximum system voltages of 600Vac with fusible and non-fusible protection options
• Meets the Underwriters Laboratories (UL) standards and is listed to UL98 standard
• Provides a variety of coil voltages, visible means of disconnection and a standard, heavy-duty safety switch with integrated shunt trip module
• Passes Class 1 ground fault testing (1200% opening)
• CSA certified

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Alternate Catalog No. : ST250

Ref. no. : 405388.

Description:  Shunt Trip (St) Range 220/250 V AC/DC

EAN: 5050096053881

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This is one of the most common tripping schemes. The protective relay (PR) contact is arranged directly to trip the circuit breaker and it simultaneously energizes an auxiliary unit X which then reinforces the contact that is energizing the trip coil.

D-2SWAXCRBS-5000-GXX-A5EXXXXXBA1-X

• Frame : DD-Frame
• Mounting : Front Mount, Rectangular Aperture - Flush Rocker Handle
• Handle Type : Blank Pole - No Handle
• Termination : Stud (M5 or 10-32)
• No of Poles : 3 pole – Imperial or RAU/LVR + 2 Circuit Breaker poles
• Rated voltages - Main Circuit : 240/415Vac; 277/480Vac (Multipole)
• Time Delay : Medium Time Delay 50/60Hz or DC
• Main Circuit Current : 50A
• Circuit Configuration : Dual Control - Shunt Trip Construction - 3rd Terminal Close to Load Side (3 Terminal)
• Voltages & Coil Ratings (Dual Control) : 220-240V AC 50/60Hz
• Voltages & Coil Ratings (Dual Control) : Stud Terminals (M5 / 10-32)
• RMU - Model : Not Applicable
• Customer Specific : Not Applicable
• Handle Color : Not Applicable
• Handle Marking : Not Applicable
• Mounting Orientation : Not Applicable
• Front Plate Marking : No Marking for Pole without Handle
• Interphase Barrier or Cover : Inter-Phase Barrier-SMALL
• Approvals : CUR, UL recognized UL1077, IEC/EN60934, CE
• Safety marks : Not Applicable
• Read more about D-2SWAXCRBS-5000-GXX-A5EXXXXXBA1-X

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Masterpact MTZ2/MTZ3 Operating Accessories

The shunt close (XF), shunt trip (MX), and undervoltage release (MN) are optional accessories mounted inside the device. They can be of standard type or diagnostic and communicating type (standard or with diagnostic function for the undervoltage release [MN]).

The standard XF, MX, and MN accessories can have either impulse-type or maintained actions, depending on the incoming commands.

The Masterpact shunt close (XF) is available as standard or with the diagnostic and communicating function.

The shunt close closes the circuit breaker instantaneously when powered if the spring mechanism is charged. The minimum duration of the pulse operating order must be 200 ms.

For information on installation, consult the instruction sheet on the Schneider Electric website:

Standard shunt close (XF): NVE40749

Diagnostic and communicating shunt close (XF diag&com): NVE40766

The Masterpact shunt trip (MX) is available as standard or with the diagnostic and communicating function.

The shunt trip opens the circuit breaker instantaneously when powered. The minimum duration of the pulse operating order must be 200 ms. The MX standard trip locks the circuit breaker in OFF position if the command is maintained.

Standard shunt trip (MX): NVE40749

Diagnostic and communicating shunt trip (MX diag&com): NVE40766

The Masterpact undervoltage release (MN) is available as standard or with the diagnostic and communicating function.

The undervoltage release instantaneously opens the circuit breaker when its supply voltage drops to a value between 35% and 70% of its rated voltage. If there is no supply to the release, it is impossible to close the circuit breaker, either manually or electrically. Any attempt to close the circuit breaker has no effect on the main contacts. Circuit breaker closing is enabled again when the supply voltage of the release returns to 85% of its rated value.

Standard undervoltage release (MN): NVE40749

Diagnostic undervoltage release (MN diag): NVE40766

The internal isolation module for Micrologic X control units provides double isolation in compliance with IEC 60664-1 (up to 12 kV). It also provides isolation between the diagnostic and communicating shunt close (XF diag&com), diagnostic and communicating shunt trip (MX diag&com), diagnostic undervoltage release (MN diag), and the electrical closing pushbutton (BPFE).

For information on accessory installation, consult instruction sheet NVE40748 on the Schneider Electric website.

The electrical closing pushbutton (BPFE) carries out electrical closing of the circuit breaker. It takes into account the internal closing conditions of the device and the external conditions that are part of the control and monitoring system of the installation. It connects to the standard shunt closes (XF) or the communicating shunt close (XF diag&com).

If the BPFE is being used, it is recommended to lock access to the closing pushbutton using the VBP accessory because the closing pushbutton does not take into account internal and external conditions.

This optional accessory is mounted on the front cover of the device.

For information on accessory installation, consult instruction sheet NVE40773 on the Schneider Electric website.

The ready-to-close contact (PF) indicates remotely that the circuit breaker is ready to close..

It indicates that the circuit breaker is ready to close when:

The circuit breaker is in the open position.

The spring mechanism is charged.

There is no maintained opening order.

This optional accessory is mounted inside the device.

For information on accessory installation, consult instruction sheet NVE35466 on the Schneider Electric website.

The spring charging motor (MCH) automatically charges the spring mechanism when the circuit breaker is closed, allowing instantaneous closing of the circuit breaker following opening.

For information on accessory installation, consult instruction sheet NVE35483 on the Schneider Electric website.

Following tripping, this function resets the overcurrent trip switch (SDE) and the mechanical indicator to enable circuit breaker closing.

The use of a shunt close (XF) is required with this option.

The additional overcurrent trip switch (SDE2) is not compatible with RES.

For information on accessory installation, consult instruction sheet NVE35503 on the Schneider Electric website.

The ERMS switch module (ESM) is an optional accessory mounted inside of the device.

It is used to engage ERMS protection settings with an external selector switch. The ESM module works in conjunction with the ERMS Digital Module, which must also be installed.

The ERMS switch module (ESM) is not compatible with M2C programmable contacts because they are installed in the same physical place.

The grounding kit (KMT) allows the circuit breaker mechanism to be grounded when the front cover is removed. The grounding is made through the cradle for the drawout version and through the mounting side plate for the fixed version.

For information on accessory installation, consult instruction sheet NVE35480 on the Schneider Electric website.

The mechanical operation counter (CDM) counts the number of operating cycles and is visible on the front panel. It is compatible with manual and electrical control functions.

This accessory is required for all source-changeover systems.

For information on accessory installation, consult instruction sheet NVE35485 on the Schneider Electric website.

The ULP port module:

Supplies 24 Vdc power to the Micrologic X control unit.

Integrates the ULP termination with the Micrologic X control unit.

Allows the connection of the Micrologic X control unit to external ULP modules, such as the embedded Ethernet interface (EIFE)) or the Ethernet interface (IFE).

The ULP port module is optional on the fixed device and standard on the drawout device. It is mounted with the terminal blocks of the device.

For information on accessory installation, consult the instruction sheet on the Schneider Electric website:

ULP port module for fixed Masterpact MTZ2/MTZ3: NVE40791 .

ULP port module for drawout Masterpact MTZ2/MTZ3: NVE40797

The embedded Ethernet interface (EIFE) enables drawout Masterpact MTZ circuit breakers to be connected to an Ethernet network. It provides digital access to all the data delivered by the Micrologic X control unit.

In addition, it monitors the position of the device in the cradle: connected, test, and disconnected.

This optional accessory is mounted on the cradle of the drawout device.

For information on accessory installation, consult instruction sheet NVE23550 on the Schneider Electric website.

For information on accessory usage, refer to user Enerlin’X EIFE Embedded Ethernet Interface for One Masterpact MTZ Drawout Circuit Breaker - User Guide (DOCA0106EN) , available on the Schneider Electric website.

The Ethernet interface (IFE) provides an Ethernet access to a single device. The device is connected to the IFE interface through the ULP port module and a prefabricated ULP cord.

For information on accessory installation, consult instruction sheet HRB49218 on the Schneider Electric website.

For information on accessory usage, refer to Enerlin’X IFE Ethernet Interface for One Circuit Breaker - User Guide (DOCA0084EN) , available on the Schneider Electric website.

The Ethernet switchboard server (IFE) provides Ethernet access to one or several circuit breakers. It allows the following communication architectures:

One single circuit breaker connected to the IFE server through the ULP port module.

Up to 20 circuit breakers, including up to 12 Compact NSX devices, through the IFM Modbus-SL (RTU) interface for one circuit breaker stacked to the IFE server.

For information on accessory installation, consult instruction sheet HRB49218 , available at the Schneider Electric website.

For information on accessory usage, refer to Enerlin’X IFE Ethernet Interface for One Circuit Breaker - User Guide (DOCA0084EN) on the Schneider Electric website.

The IFM Modbus-SL (RTU) interface provides access from a single device to a Modbus serial line communication network. The device is connected to the IFM interface through the ULP port module and a prefabricated ULP cord.

For information on installation, consult the instruction sheet on the Schneider Electric website: https://www.schneider-electric.us/en/download/document/NVE85393/.

The IO input/output application module for one circuit breaker is one component of the ULP architecture.

The IO input/output application module uses built-in applications to enhance control and monitoring functions. Its resources are:

Six self-powered digital inputs for either NO and NC dry contact or pulse counters.

Three digital outputs that are bistable relay (5 A maximum).

One analog input for a Pt100 temperature sensor.

For information on accessory installation, consult instruction sheet HRB49217 on the Schneider Electric website.

For information on accessory usage, refer to Enerlin’X IO Input/Output Application Module for One Circuit Breaker - User Guide (0613IB1317) on the Schneider Electric website.

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