Square D QO 3-Pole Circuit Bre...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$17.90
Square D QO 3-Pole Circuit Breaker Retaining Bracket Kit

Square D QO 3-Pole Circuit Breaker Retaining Bracket Kit

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Model: PK3MB

In Stock (leaves warehouse same day if ordered before 3pm ET)

$17.90
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Square D QO 3-Pole Circuit Breaker Retaining Bracket Kit

The Square D QO 3-Pole Circuit Breaker Retaining Bracket Kit is a mounting and retaining accessory engineered for the QO range of load centers, allowing QO breakers to be securely installed and held in place. This kit is configured for 3-pole applications and is compatible with the QON342L225 base plate, with a specified screw tightening torque of 25 lb.in for proper installation. Backed by an 18-month warranty, this Square D accessory supports both residential and industrial QO load center systems.

Key Features

  • Configuration: 3-Pole retaining bracket kit designed to secure three-pole QO circuit breakers in place.
  • Provided Equipment: Includes 1 mounting hardware set and 1 QO retainer for a complete installation.
  • Tightening Torque: Screw tightening torque of 25 lb.in ensures a secure, code-compliant fit.
  • Compatible Base Plate: Designed for use with the QON342L225 base plate.
  • Mercury Free Construction: Manufactured without mercury for safer handling and disposal.
  • Range: Part of the Square D QO range of load center accessories.

Certifications & Compliance

  • RoHS Eur Compliant with Exemptions
  • WD Status: 1 - GSC Certified
  • Mercury Free
  • Environmental Disclosure: ENVPEP2212001
  • Country of Origin: United States

Technical Specifications

  • Warranty: 18 months
  • Take Back: No
  • Tier: 3
  • Warranty Period: 18 months
  • Returnability: Yes
  • Product Contributes To Saved And Avoided Emissions: No
  • Sustainable Packaging: No
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: No
  • Tier Id: 3
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Legacy WEEE Scope: In
  • Packaging Made With Recycled Cardboard: No
  • H And D Enrichment Assignment: yes
  • With Recycled Cardboard: No
  • WEEE Product Category: 5
  • Range Of Product: QO
  • Without Single Use Plastic: No
  • ROHS Exemption Information: Yes
  • Local Publishable Date: 2025-09-23
  • H And D Domain: Safety
  • H And D Enrichment Class 4: Enclosure accessory
  • Relationshiptype: Compatible relationship
  • Product Or Component Type: Circuit Breaker Retaining Kit

Typical Applications

  • Residential and Industrial QO Load Center Installations
  • Circuit Breaker Retention and Securement
  • Panelboard Maintenance and Upgrades
  • Electrical Panel Servicing and Retrofits

Why Square D?

Square D QO accessories are built to support the safe, secure operation of QO load centers in both residential and industrial settings. This retaining bracket kit is mercury free, RoHS Eur compliant with exemptions, and GSC certified, reflecting Square D's commitment to reliable, code-compliant electrical hardware backed by an 18-month warranty.

Manufacturer Resources

Product Specs

Product Type:
Breaker Mounting Accessory
Series:
QO
Configuration:
3-Pole
Country Of Origin:
United States
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers

Square D PK3MB – Frequently Asked Questions

1) What does the Square D PK3MB retaining bracket kit actually do in a QO load center?
The PK3MB is a hold-down kit that mechanically secures a 3-pole QO breaker to the load center so it can't be pulled off the bus. It's a mounting accessory, not a breaker, and ships with one mounting hardware set plus one QO retainer, so you don't need to source separate screws. Common uses are panelboard upgrades, service retrofits, and any install where the breaker has to be locked in place.
2) Will the PK3MB work with a 1-pole or 2-pole QO breaker?
No. The kit is configured for 3-pole applications only, and the retainer geometry follows the three-pole breaker footprint. For single or two-pole QO breakers you need the hold-down kit matched to that pole count.
3) Which Square D panel interior is the PK3MB retainer kit matched to?
It's specified for use with the QON342L225 base plate in the QO range of load centers, covering both residential and industrial QO installations. If your interior is a different series, the retainer won't line up with the mounting provisions.
4) I have an Eaton or ABB panel, not Square D. Can I use the PK3MB?
No. Hold-down kits are specific to the panel line, and the PK3MB is a QO part tied to the QON342L225 base plate. For other lines you'd look at the matching accessory for that brand, for example the ABB ProStack MB Series 3-phase breaker mounting kit, the ABB THQLRK Series main breaker retainer rated 125A, the Eaton BR PON generator breaker hold-down kit, or the Eaton QC circuit breaker face mounting plate for cable-in/cable-out applications. Pick the one that matches the panel you're working in.
5) Can an Eaton BR generator hold-down kit be used in place of the Square D QO PK3MB retaining bracket kit?
No. The PK3MB is a Square D QO retaining bracket kit built for the QO range of load centers and configured for 3-pole breakers, and it is matched to the QON342L225 base plate. The Eaton BR PON Generator Breaker Hold-Down Kit is an Eaton BR PON series accessory, so it belongs in an Eaton BR panel rather than a QO load center. Breaker retention hardware is panel-specific, so stay within the series the load center is built from.
6) What torque do I tighten the QO breaker retainer screws to?
25 lb-in on the retaining screws. Under-torquing leaves the breaker able to shift on the bus stabs; over-torquing can strip the mounting hardware or distort the retainer. Use a calibrated screwdriver or small torque wrench rather than feel.
7) Is the Square D QO hold-down kit RoHS compliant and mercury free?
Yes on both. The kit is RoHS Eur compliant with exemptions, mercury free, and carries WD status 1 - GSC Certified, with environmental disclosure ENVPEP2212001. It's made in the United States, which matters if you're buying against a domestic-content requirement.
8) Do I need to order screws or any other hardware with the QO 3-pole retainer kit?
No separate hardware order. The kit comes as one mounting hardware set and one QO retainer, which is everything for a single 3-pole breaker. If you're securing multiple 3-pole breakers in the same panel, order one kit per breaker.
9) Is a breaker hold-down kit like the PK3MB different from a stacking or face plate kit?
Yes, they solve different problems. The PK3MB retains a 3-pole QO breaker against the bus in a QO load center. A stacking kit, such as the ABB Pro-Stak A2 MCCB kit in the MBA1 Series, is about mounting arrangement of molded case breakers, and a face mounting plate like the Eaton QC cable-in/cable-out plate covers and mounts a breaker in an enclosure face. If your goal is simply keeping the breaker from backing off the stabs, the retainer kit is the right category.
10) I need to mount a breaker to a panel face or pedestal rather than retain one in a load center. What should I use instead of the Square D QO PK3MB?
The PK3MB is a retaining bracket kit that secures 3-pole breakers inside a QO load center, so it is not the part for a face or pedestal mount. For a face-mounted breaker with cable-in/cable-out wiring, the Eaton QC Circuit Breaker Face Mounting Plate is built for that arrangement, and for a power pedestal the Eaton Lighthouse-SS Power Pedestal Breaker Plate is the corresponding plate. Both are Eaton accessories, so match them to Eaton equipment rather than a QO panel.
11) What part number do I give my distributor for the Square D QO 3-pole breaker retaining kit?
Order Square D PK3MB. It's a single-configuration part with no finish or size options to specify, so the model number is all your supplier needs.
How fast can I get the Square D PK3MB delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D PK3MB come with a warranty?
Absolutely. The Square D PK3MB is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D PK3MB?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Square D PK3MB from ZenSupply?
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