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How to Wire a Shunt Trip Breaker Wiring Diagram (DIY Guide)

Written by  Edwin Jones  / Fact checked by  Andrew Wright

Table of Contents

Tools You Need

Step 1. install shunt trip accessory to the circuit breaker, step 2. installing shunt trip circuit breaker to the panel board, step 3. understanding the shunt trip breaker wiring diagram, step 4. start wiring the shunt trip circuit breaker to the safety control, step 5. checking or testing the installed unit.

Do you want to have an additional layer of protection for your home? Are you planning to install a shunt trip breaker in your home circuit? Are you looking for a how to wire a shunt trip breaker wiring diagram?

Yes, shunt trip breakers protect your home by cutting off power when activated manually or by your sensor. Although it’s not required, it ensures that power is switched off when the sensor is triggered. These sensors could be smoke detectors, fire alarms, or even a manual emergency stop button.

If you intend to add a safety system, I highly recommend reading through the steps below to know what to expect when installing this accessory.

shunt-trip-circuit-breaker-wiring-diagram

These are the tools and items you need to get started:

  • Shunt trip accessory designed for your existing circuit breaker model .
  • A circuit breaker is compatible with your shunt trip accessory if your current breaker isn’t compatible with any shunt trip accessories.
  • An emergency stop switch if you want to install a kill-switch button.
  • Screwdrivers of various tips and sizes as required in your electrical system
  • A Shunt trip wiring diagram as your wiring guide
  • Insulating gloves and eye protection

Not all circuit breakers accept shunt trip accessories. In fact, different breakers may require specific shunt trip accessory models. Some breakers also have a built-in shunt trip accessory—all you need is to wire and connect to your circuit to activate it.

Furthermore, some circuit breakers are only intended to have shunt trip accessories installed from the factory. So, before purchasing a shunt trip accessory, it’s highly recommended that you review what make and model of breaker you have. That way, you know what your options are before installation.

If you have a compatible system, you still need a shunt trip circuit breaker wiring diagram to ensure correct installation. However, do not just download any chart from the internet. For example, if you have a Square D branded circuit breaker, you need a Square D shunt trip breaker wiring diagram.

Before beginning installation, ensure that everything you need is within your reach. Also, always think of safety first!

Step-By-Step Guide to Wire a Shunt Trip Breaker Wiring Diagram

square-d-shunt-trip-breaker-wiring-diagram

First, install the shunt trip accessory to your breaker. This procedure is pretty straightforward. Open your circuit breaker using a small flathead screw. Insert the insulator into its right place, and feed the wires in the holes near the shunt trip. Secure the shunt trip to its location, and put the cover back to the circuit breaker. And you’re done!

You can watch this video by Aaron CBIONE for a video guide on installing a shunt trip to the circuit breaker.

Note: Different makers have different installation processes. It’s best to refer to the manual guide provided in your circuit breaker.

Once the shunt trip accessory is connected to your circuit breaker, you need to connect it to your panel board as the main circuit breaker. Before installing this device, ensure that your system has no power.

If you’re not sure, it’s best to consult a professional electrician to avoid any accidents.

Once ready, open your panel board using your flathead screwdriver and plug in your shunt trip circuit breaker into the main power supply. Connect the mainline and the supply wire to the circuit breaker, then proceed to the next step.

Before wiring your shunt trip breaker to your safety control system or switch, you need first to understand its wiring diagram. This is a crucial part of the installation—that’s why you can’t skip it and need to be more careful with it.

Take a look at this recognizable wiring diagram made by Sikandar Haidar of Electriconline4u as a typical example.

Note: This sample diagram is simple and easy to follow. However, different systems may require other designs. Refer to the charts provided with the shunt trip, safety control system, or switch before starting. If you’re unsure, it’s best to consult a professional.

Using the sample above, connect one wire of the shunt trip to the neutral connection, then attach the other wire to the kill switch. Place a wire on the other side of the terminal of the kill switch through the supply connection.

With this, you now have a kill switch you can use to trip your electrical system’s main breaker quickly.

Pro Tip: Place the kill switch in an accessible area like near an emergency exit, so if a problem occurs, you can easily access it.

After installation, turn on or reconnect the power source to your main breaker panel . Flip the shunt trip circuit breaker on to begin testing your work.

To test your installation, press the kill switch. The shunt trip circuit breaker should immediately trip after pressing the kill switch. If it is not tripped, then there is something wrong with your installation.

Although not a requirement, having a shunt trip breaker in your residence provides an additional layer of safety. This is an excellent option if you have sensors in your building, like smoke detectors or fire alarms.

In case of emergencies, like flooding or sprinkler activation, you can also cut the power source by hitting the kill switch. This can prevent any shorts or accidental electrocutions because no power is supplied to your outlets.

So, what do you think of the installation process? Is it easy enough to DIY? Would you do this on your own? Remember to follow how to wire a shunt trip breaker wiring diagram. If you have any questions, feel free to reach out in the comments below.

Andrew-Wright

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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How To Install a Square D QO Circuit Breaker

Trevor

Circuit breakers are a crucial component of any household’s electrical system. They are designed to protect your home and appliances from electrical overload, which can lead to fires or other dangerous situations. One of the most trusted names in the industry is Square D, and their QO circuit breakers are known for their reliability and ease of installation.

In this comprehensive guide, we’ll cover everything you need to know about installing a Square D QO circuit breaker. We’ll walk you through the process step-by-step, discuss safety precautions, provide tips on selecting the correct breaker size, and more.

To install a Square D QO Circuit Breaker, first ensure all power is turned off and you have the necessary tools. Remove the panel cover, prepare the wires, and connect the main and neutral wires. Install the circuit breaker onto the mounting rail and connect it to the bus bar. Torque all connections, reinstall the panel cover, and turn the power back on. Finally, test the circuit breaker to ensure it’s functioning properly. Always follow safety precautions and consult a professional if unsure.

What You’ll Need

Before we dive into the step-by-step process, here are the tools you’ll need:

  • Flathead screwdriver
  • Wire stripper
  • Needle-nose pliers
  • Voltage tester

Ensure you have these tools on hand before beginning the installation.

Safety First: Precautions to Consider

When dealing with electrical systems, safety is paramount. Here are some key precautions to take:

  • Ensure all power supplying the equipment is turned off.
  • Wear appropriate personal protective equipment (PPE).
  • Use only Square D brand circuit breakers and accessories.
  • Follow installation instructions carefully.
  • Regularly inspect and maintain the circuit breakers.
  • Consult a licensed electrician if unsure about any part of the installation process.

Step-by-Step Installation Guide

Step 1: turn off power.

Before working on the load center, turn off each of your branch circuit breakers one by one. If you have a main breaker, turn it off as well to ensure that there is no power in the panel.

Step 2: Remove the Panel Cover

Unscrew the panel cover to access the breakers.

Step 3: Prepare the Wires

Pull the conductors into the enclosure and secure them using approved wire clamps, conduit bushings, or other approved methods to prevent damage to the conductor insulation.

Step 4: Connect the Main and Neutral Wires

Install the main and neutral wires according to the wiring diagram on the load center.

Step 5: Install the Circuit Breaker

For standard and tandem branch circuit breakers, refer to the wiring diagram on the load center for the installation location. For QOT tandem-type circuit breakers, hold the circuit breaker at a 30–45° angle and install the wire terminal end of the circuit breaker onto the mounting rail.

Step 6: Connect the Circuit Breaker to the Bus Bar

Rotate the circuit breaker until the plug-on jaws plug securely onto the bus bar connector.

Step 7: Torque Connections

Torque each neutral and ground connection to the value specified on the load center wiring diagram attached to the enclosure.

Step 8: Reinstall the Panel Cover

Once the circuit breaker is installed, replace the panel cover and secure it with screws.

Step 9: Turn On Power

Turn on the main breaker (if applicable) and then turn on each branch circuit breaker one by one.

Testing the Circuit Breaker

After installation, it’s crucial to test the circuit breaker to ensure it’s working properly. Use a multimeter to test the breaker. If the reading is zero, the breaker is faulty and needs to be replaced.

Installing a Square D QO Circuit Breaker can seem daunting, but with the right tools and a careful approach, it’s a task you can complete safely and successfully. Always remember to follow all safety precautions and consult a professional if you’re unsure about any part of the process. With your new circuit breaker installed, you can rest easy knowing your home’s electrical system is well-protected.

Frequently Asked Questions

What is the function of a square d qo circuit breaker.

A Square D QO Circuit Breaker is designed to protect your home’s electrical system from overload. When an overload or short circuit occurs, the breaker trips and disconnects the flow of electricity, preventing damage to the wiring and possible fire hazards.

Can I replace a circuit breaker by myself?

Yes, you can replace a circuit breaker by yourself. However, it’s crucial to understand the risks involved and take all necessary safety precautions. If you’re not comfortable or unsure about any part of the process, it’s always best to hire a licensed electrician.

How do I know if my circuit breaker is faulty?

If a circuit breaker is faulty, it won’t stay reset or it may trip frequently. You can also use a multimeter to test the breaker. If the reading is zero, the breaker is faulty and needs to be replaced.

How often should I inspect my circuit breakers?

It’s good practice to inspect your circuit breakers at least once a year. This will help you identify any potential issues and ensure that your electrical system is functioning safely and effectively.

Where can I buy a Square D QO Circuit Breaker?

Square D QO Circuit Breakers are widely available and can be purchased at most home improvement stores, electrical supply stores, or online. Always ensure that you’re buying from a reputable source to guarantee the quality and authenticity of your product.

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Square D Shunt Trip Circuit Breaker Wiring Diagram

Circuit breakers keep your home and office systems safe from electrical overloads. But when the electricity needs to be shut off in a hurry, a square D shunt trip circuit breaker can provide additional protection and peace of mind. Understanding how to wire a square D shunt trip circuit breaker is important for keeping everyone in your home or business safe. A shunt trip breaker works by providing a remote way to trip the circuit breaker immediately. That means that if there’s an electrical emergency, you can quickly cut off power to a specific area from a remote location. Square D offers a variety of shunt trip circuit breakers to meet your needs. All of their products come with detailed wiring diagrams and instructions, so you know exactly how to safely install them. The installation process is fairly straightforward and can be done in just a few minutes. For the more advanced do-it-yourselfer, the wiring diagram should be used as a reference guide. It provides all the necessary information you’ll need to wire a square D shunt trip circuit breaker. This includes detailed diagrams of what wires need to be connected to which terminals, as well as color-coded wiring diagrams. Additionally, the wiring diagram also shows where each component should be attached. Once the circuit breaker is wired properly and installed, it’s time to activate it. To do this, the user will need to manually trip the breaker. This is done by pressing the on/off switch located on the front of the breaker. By employing a simple square D shunt trip circuit breaker wiring diagram, users can easily and safely install a shunt trip breaker in their home or business. This way, they’ll have the peace of mind that if an emergency arises, they can easily and quickly shut off electricity to the affected area.

Circuit Breaker Wiring Diagrams Web

Circuit Breaker Wiring Diagrams Web

Square D Shunt Trip Powerpact B And Compact Nsxm Circuit Breaker 110 130v Ac 482h65 Lv426843 Grainger

Square D Shunt Trip Powerpact B And Compact Nsxm Circuit Breaker 110 130v Ac 482h65 Lv426843 Grainger

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Compact Nsf And Nsj 150 To 600 A Circuit Breakers

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Square D Qob3901021 Province Electric Supply

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The Common Wire On Normally Open And Closed Contacts Of A Shunt Trip Breaker Should Be My Neutral

The Common Wire On Normally Open And Closed Contacts Of A Shunt Trip Breaker Should Be My Neutral

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Br120st Eaton Type Br Brkr 20a 1 Pole 120 240v 10k W Shunt Trip

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Powerpact H J And L Frame Circuit Breakers

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  • Distribution Equipment
  • Circuit Breakers & Breaker Enclosures
  • Plug In Circuit Breakers

Mini circuit breaker, QO, 50A, 3 pole, 120/240VAC, 10kA, plug in mount, AC shunt

SQUARE D

MINIATURE CIRCUIT BREAKER 240V

Mayer-DDS-Mini circuit breaker, QO, 50A, 3 pole, 120/240VAC, 10kA, plug in mount, AC shunt-2

  • Certifications: CSA, UL Listed
  • Circuit Breaker Type: Standard
  • Depth: 74 mm
  • Height: 79 mm
  • Line Rated Current: 50 A
  • Mounting Type: Plug-In
  • Net Weight: 0.531 kg
  • Warranty Length: 18 mth
  • Width: 76 mm
  • 0bb600bbf776193fc7adc2177625ac48be0b4a3820150616-E84967 QO(B) 1P_2P_3P.pdf (Download)
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  • f17d11298d90d01d84efb38f4010c8efe3cec855QO3501021_document.pdf (Spec Sheets)
  • Product Description
  • Specifications
  • Environment
  • Product Certifications : UL Listed || CSA
  • Ambient Air Temperature For Operation : 40 °C
  • Contractual warranty
  • Warranty : 18 months
  • Offer Sustainability
  • Rohs Exemption Information : Yes
  • Mercury Free : Yes
  • Sustainable Offer Status : Green Premium product
  • Reach Regulation : Reference contains Substances of Very High Concern above the threshold
  • China Rohs Regulation : Product out of China RoHS scope. Substance declaration for your information.
  • Circularity Profile : N/A
  • Eu Rohs Directive : Compliant with Exemptions
  • Halogen Content Performance : Halogen free product
  • Complementary
  • Height : 79 mm
  • Tightening Torque : 5-5 N.m
  • Number Of Spaces Required : 4
  • Net Weight : 0.531 kg
  • Breaking Capacity : 10 kA 120/240 V AC 50/60 Hz || 10 kA 240 V AC 50/60 Hz || 10 kA 120 V AC 50/60 Hz
  • Awg Gauge : AWG 8...AWG 2 copper or aluminium
  • Width : 76 mm
  • Depth : 74 mm
  • Circuit Breaker Type : standard
  • Range Of Product : QO
  • Accessory / Separate Part Type : shunt trip 120/208/240 V AC
  • Product Or Component Type : miniature circuit-breaker
  • Circuit Breaker Application : HACR rated
  • Mounting Mode : plug-in
  • Poles Description : 3P
  • Electrical Connection : box lugs
  • Line Rated Current : 50 A
  • [Ue] Rated Operational Voltage : 120/240 V AC || 240 V AC || 120 V AC

Electric How

Square D Shunt Trip Circuit Breaker Wiring Diagram

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Installation Instructions For Shunt Trip Ldb Ld Hld Ldc Lw Hlw Lwc Circuit Breakers Series C Molded Case Switches An

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How Does A Shunt Trip Work To Circuit Breaker Quora

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How To Wire The Circuit Breaker Shunt Trip Nader

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Square D 70a Amp 3p Pole 18ka 480v Feed Through Fal Circuit Breaker W 120 240v Shunt Trip Fal340701021 U Com

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Shunt Trip Breakers Internachi Inspection Narrative Library

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Auxilary Breaker C W Shunt Trip Tm 5 3895 374 24 1 130

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Engine Accessory Circuit

Engine Accessory Circuit

Eaton Is Not Liable For The Misapplication Or Misinstallation Of Its Products

Eaton Is Not Liable For The Misapplication Or Misinstallation Of Its Products

How Do You Wire The Shunt Trip On A Edb Breaker Schneider Electric Usa

How Do You Wire The Shunt Trip On A Edb Breaker Schneider Electric Usa

How To Install Trip Breakers

How To Install Trip Breakers

Square D Schneider Springfield Electric Supply Co

Square D Schneider Springfield Electric Supply Co

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IMAGES

  1. Square D Qo3451021 3 Pole 45 Amp 240 Volt Qo Shunt Trip Breaker

    square d qo shunt trip breaker wiring diagram

  2. Shunt Trip Breaker Wiring Diagram

    square d qo shunt trip breaker wiring diagram

  3. Shunt Trip Breaker Wiring Diagram Explanation

    square d qo shunt trip breaker wiring diagram

  4. Square D Load Center Wiring Diagram

    square d qo shunt trip breaker wiring diagram

  5. How do you wire the shunt trip on a EDB breaker?

    square d qo shunt trip breaker wiring diagram

  6. Shunt Trip Wiring Diagram Square D Download

    square d qo shunt trip breaker wiring diagram

VIDEO

  1. Circuit Breaker working and wiring connections

COMMENTS

  1. Illustration: Wiring Diagram for QO/QOB/QOU Shunt Trip

    Illustration: Wiring Diagram for QO/QOB/QOU Shunt Trip. Skip To Main Content. USA Our Brands Item count in cart is 0 My Products Item count in cart is 0 My Documents Login/Register User name ... I'd like to receive news and commercial info from Schneider Electric and its affiliates via electronic communication means such as email, and I agree ...

  2. Wiring a Shunt Trip on QO™ Circuit Breakers

    Welcome to our tutorial on wiring a Shunt Trip on QO™ Circuit Breakers. In this step-by-step guide, we'll walk you through the process of wiring a Shunt Trip...

  3. Illustration: Wiring Diagram for QO/QOB/QOU Shunt Trip

    SUBSCRIBE TO EMAIL: Get monthly updates from Schneider Electric delivered right to your inbox. I'd like to receive news and commercial info from Schneider Electric and its affiliates via electronic communication means such as email, and I agree to the collection of information on the opening and clicks on these emails (using invisible pixels in the images), to measure performance of our ...

  4. PDF Instruction Bulletin 07/2012 QO™ and Homeline™ Load Centers

    2. Turn OFF (O) the circuit breaker. 3. For QO tandem only, hold the circuit breaker at 30-45° angle. 4. Install the wire terminal end of the circuit breaker into the mounting rail. 5. Rotate the circuit breaker inward until the plug-on ja w fully engages the bus bar connector. Keep the bottom of the circuit breaker's case against the ...

  5. PDF QO and QOB Miniature Circuit Breakers

    QO and QOB circuit breakers have Visi-Trip ... Many Square D circuit breakers can also be applied on 50 Hz systems without derating. GFCI, AFCI and EPD devices are rated for 60 Hz operation only. Frequencies can affect the thermal, magnetic and short-circuit characteristics of circuit breakers. See Data Bulletin 0100DB0101

  6. How to Wire a Shunt Trip Breaker Wiring Diagram (DIY Guide)

    Step-By-Step Guide to Wire a Shunt Trip Breaker Wiring Diagram. Step 1. Install Shunt Trip Accessory to the Circuit Breaker. Step 2. Installing Shunt Trip Circuit Breaker to the Panel Board. Step 3. Understanding the Shunt Trip Breaker Wiring Diagram. Step 4.

  7. How To Install a Square D QO Circuit Breaker

    To install a Square D QO Circuit Breaker, first ensure all power is turned off and you have the necessary tools. Remove the panel cover, prepare the wires, and connect the main and neutral wires. Install the circuit breaker onto the mounting rail and connect it to the bus bar. Torque all connections, reinstall the panel cover, and turn the ...

  8. PDF Square D QO load centers and circuit breakers

    only breakers marked on the load center label and/or wiring diagram. QO load centers are marked to accept only genuine QO circuit breakers. QO circuit breakers should only be used in panels marked to accept them. Any other use voids your warranty and may reduce protection, increase liability risks, and violate the NEC.

  9. How to Wire a Shunt Trip Breaker (5-Step Guide)

    Step 2: Find the two screws on the shunt trip unit - these are where you'll connect your control circuit wires. Step 3: Attach the control circuit wires to these screws. Remember, with AC voltage, it doesn't matter which wire goes on which screw. Step 4: Finally, apply 120, 208, or 240 volts AC across the wires, and voilà, the breaker ...

  10. Video: How do you wire a QO/QOB shunt trip breaker (ex. QO120-1021

    QO. Environment: Electrical Distribution Equipment. Resolution: Connect the appropriate voltage (ie. 120V to 240V for the -1021 suffix) to the two terminals on the shunt trip. Land the switch leg from the source contact on one terminal (either) and the neutral wire (L2 , X2 ) to the other terminal. The shunt trip has coil clearing contacts that ...

  11. PDF Square D QO Load Centers and Circuit Breakers

    In the event of a Combination Arc Fault Circuit Breaker trip, quickly identifying the source of the trip event is key. To assist our customers, Square D has developed the TIME SAVER indication feature, now standard on ... marked on the load center label and/or wiring diagram. QO Load Centers are marked to accept only genuine QO Circuit Breakers ...

  12. PDF Square D QO Load Centers and Circuit Breakers

    In the event of a Combination Arc Fault Circuit Breaker trip, quickly identifying the source of the trip event is key. To assist our customers, Square D has developed the TIME SAVER indication feature, now standard on ... marked on the load center label and/or wiring diagram. QO Load Centers are marked to accept only genuine QO Circuit Breakers ...

  13. Square D Shunt Trip Breaker Wiring Diagram

    Figure Wiring Diagrams for Masterpact NW Circuit Breakers D—24 Vdc power supply for trip unit must be separate and isolated from 24 Vdc power supply for breaker closing springs prior to actuating the shunt close (XF) device . E. V to V for the suffix) to the two terminals on the shunt trip. Land the switch leg from the source contact on one ...

  14. QOB1201021

    Schneider Electric USA. QOB1201021 - Mini circuit breaker, QO, 20A, 1 pole, 120/240VAC, 10kA, bolt on mount, AC shunt.

  15. Square D Shunt Trip Circuit Breaker Wiring Diagram

    Square D shunt trip circuit breaker wiring diagram is essential for anyone who wants to understand the intricate workings of this type of electrical device. This diagram provides a visual representation of how the shunt trip mechanism works, making it easier to understand and troubleshoot if any issues arise. In this article, we will delve ... <a title="Square D Shunt Trip Circuit Breaker ...

  16. Shunt Trip Circuit Breaker Wiring Diagram

    Please look at the above shunt trip breaker wiring diagram. A mentioning fact is that here the tripping coil in the MCCB is rated for 230V single-phase supply. Let's discuss the connection procedure: At first we have to connect the neutral wire of the power supply to anyone terminal of the shunt trip coil. If its terminals are identified ...

  17. Square D Qo Load Center Wiring Diagram

    A Square D Qo Load Center Wiring Diagram is a schematic representation of the different parts of the electrical system. This means that it is a visual representation of the various components that connect together in a system. As such, the diagram must show exactly how each component is connected, otherwise it could result in a potentially ...

  18. Square D Shunt Trip Circuit Breaker Wiring Diagram

    By employing a simple square D shunt trip circuit breaker wiring diagram, users can easily and safely install a shunt trip breaker in their home or business. This way, they'll have the peace of mind that if an emergency arises, they can easily and quickly shut off electricity to the affected area. Square D Qob220 1021 2 Pole 20 Amp W Shunt ...

  19. Mini circuit breaker, QO, 50A, 3 pole, 120/240VAC, 10kA, plug in mount

    /Product/SQUARE-D-Mini-circuit-breaker-QO-50A-3-pole-120-240-VAC-10-kA-plug-in-mount-AC-shunt-trip-785901494157. Certifications: CSA, UL Listed ... This product includes an AC shunt trip. QO circuit breakers are UL Listed under UL File E84967 and are CSA Certified under CSA Master Contract 153555. Environment; Product Certifications : UL Listed ...

  20. QOB1201021 Square D Single Pole 20 Amp Circuit Breaker

    QOB1201021. 2O AMP SINGLE POLE BREAKER WITH SHUNT TRIP. BRANCH TYPE. NQ SERIES PANELBOARD USED ON. UL, CSA APPROVAL. APPLIANCE, LIGHTING APPLICATION. 120/240 VAC AT 50/60 HZ (UL/CSA), 48 VDC VOLTAGE RATING. 10 KILOAMPERE AT 120/240 VAC (UL/CSA), 5 KILOAMPERE AT 48 VDC INTERRUPTING RATING. 20 AMPERE CURRENT RATING.

  21. QO1201021 Shunt Trip 20A Single Pole by Square D

    QO1201021 Shunt Trip 20A Single Pole by Square D Square D by Schneider Electric. $229.36. SKU: QO1201021 UPC: 785901493815 Condition: New Shipping: Calculated at Checkout ... Overview; Warranty Information; Product Description QO1201021. Shunt Trip Circuit Breaker; Square D Brand; OEM; QO Model; Installation: Plug on; 120V; Single Pole; 20 ...

  22. Square D Shunt Trip Circuit Breaker Wiring Diagram

    Powerpact H J And L Frame Circuit Breakers. K Frame Shunt Trip. What Is The Cheapest Way To Shunt Trip Two 120v Circuits Under A Hood. Qob120vh Mini Circuit Breaker Qo 20a 1 Pole 120 240vac 22ka Bolt On Mount Schneider Electric Usa. How To Install Trip Breakers. Square D Qob220 1021 2 Pole 20 Amp W Shunt Trip Com. Circuit Breaker Wiring ...

  23. Does Square D make QO breaker with a shunt trip and aux switch

    QOB breaker with shunt trip and aux switch accessory. Product Line: Miniature Circuit Breaker. Environment: QOB Circuit Breaker. Resolution: One or the other device can be installed, but not both. See Is an auxiliary switch available on both the QO and QOB circuit breakers? for more information.