Square D QO Load Center Retain...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$11.03
Square D QO Load Center Retaining Bracket Kit, 100A-125A Right Side

Square D QO Load Center Retaining Bracket Kit, 100A-125A Right Side

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Model: PK4MB2LA

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

$11.03
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Square D QO Load Center Retaining Bracket Kit, 100A-125A Right Side

The Square D QO Load Center Retaining Bracket Kit is built for QO load centers rated 100A to 125A, installing on the right side of the enclosure to help secure QO breakers, ground fault interrupters, arc fault interrupters, and surge arresters inside the panel. Hardware is rated to a 35 lb.in tightening torque for a properly secured fit, and the kit is manufactured in the United States. Designed to meet residential, commercial, and industrial protection requirements, this accessory helps maintain a code-compliant QO load center assembly.

Key Features

  • Amperage Compatibility: Engineered for 100A to 125A QO load centers, right-side mounting position.
  • Tightening Torque: Retaining screw torque rated at 35 lb.in for a secure, properly fastened installation.
  • Complete Kit: Includes 1 QO retainer and 1 set of mounting hardware for straightforward field installation.
  • Broad Device Compatibility: Retains QO breakers, ground fault interrupters, arc fault interrupters, and surge arresters within the load center.
  • Country of Origin: Manufactured in the United States.
  • Mercury Free: Constructed without mercury content.

Certifications & Compliance

  • Product characteristics conformity certified by Underwriters Laboratories (UL)
  • RoHS EUR Compliant with Exemptions
  • Mercury Free

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
  • Product Availability: Stock - Normally stocked in distribution facility
  • ROHS Eur Status: Compliant with Exemptions
  • ROHS Exemption Information: Yes
  • ROHS Eur Full Compliance Status: Compliant with Exemptions

Typical Applications

  • Residential QO Load Center Installations
  • Circuit Breaker Retention and Securing
  • QO Panelboard Upgrades and Repairs
  • Commercial and Industrial Electrical Panels
  • Installations Requiring GFCI, AFCI, or Surge Arrester Retention

Why Square D?

Square D QO load center accessories are built to secure critical overcurrent protection devices with consistent, torque-rated hardware, supporting code-compliant installations across residential, commercial, and industrial applications. Product characteristics conformity is certified by Underwriters Laboratories (UL), giving contractors and end users confidence in reliable, mercury-free construction manufactured in the United States.

Manufacturer Resources

Product Specs

Product Type:
Panelboard Accessory
Series:
QO
Amperage Rating:
100A-125A
Listing:
UL Listed
Country Of Origin:
United States
Configuration:
Right Side
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Panelboards & Load Centers

Square D PK4MB2LA – Frequently Asked Questions

1) Can I use this bracket in an Eaton or ABB panel instead of a Square D?
No. The PK4MB2LA is a QO series part and only belongs in a Square D QO load center; load center interiors are not interchangeable between manufacturers. For other brands, go to the matching accessory, such as the ABB THQC 1-Pole Front Mounting Plate for THQC, or the Eaton Pow-R-Stock Series Rating Kit for PRL1X/2X and PRL1A/2A panels.
2) Can an ABB THQC front mounting plate be used in place of the Square D PK4MB2LA retaining bracket kit?
No. The PK4MB2LA is a QO-series retaining bracket kit that mounts on the right side of a 100A to 125A QO load center to hold QO breakers, GFCI and AFCI devices, and surge arresters in place. The ABB TQCFMP1 is a 1-pole front mounting plate for ABB's THQC series, a different breaker family and a different mounting function. Keep the retainer in the same series as the load center and the breakers it secures.
3) What is the difference between the Square D PK4MB2LA retaining bracket kit and the Eaton SRK series rating kit?
They do different jobs in a panel. The PK4MB2LA is a mechanical retaining bracket kit for Square D QO load centers rated 100A to 125A, supplied with one QO retainer plus mounting hardware to secure breakers and similar devices inside the enclosure. The Eaton SRK is a Pow-R-Stock series rating kit for PRL1X/2X and PRL1A/2A panel systems, which addresses series rating of the panel rather than physically retaining devices. One is not a replacement for the other, and the Eaton kit is for Eaton panelboards.
4) What does a QO load center retaining bracket actually do?
It clamps the installed devices in place inside the panel. The QO retainer holds breakers, GFCIs, AFCIs, and surge arresters down on the bus so they cannot back off, which is required for a code-compliant QO load center assembly. On panels that call for it, the panel is not finished until the retainer is in.
5) Is this retainer kit UL listed for use in a QO panel?
Yes. Product characteristics conformity on the PK4MB2LA is certified by Underwriters Laboratories, and it is carried as UL Listed. It is also mercury free and RoHS EUR compliant with exemptions.
6) Will this kit retain AFCI and GFCI breakers, not just standard QO breakers?
Yes, the retainer covers QO breakers along with ground fault interrupters, arc fault interrupters, and surge arresters. Useful on panel upgrades where plug-on AFCI or GFCI devices are being added to an existing QO load center.
7) I am standardizing panel accessories across a building that has both Square D and Eaton panelboards. Can one retaining kit cover both?
No, these accessories follow the panel family. The PK4MB2LA is specific to Square D QO load centers in the 100A to 125A range and mounts on the right side of the enclosure. Eaton panelboard accessories such as the SRK kit are built for Eaton's PRL1X/2X and PRL1A/2A systems. Plan on stocking the accessory that matches each panel line rather than one part for both.
8) Is this a Buy American / domestic-sourced electrical part?
The PK4MB2LA QO retainer kit is manufactured in the United States, which is what institutional and government procurement usually needs on the submittal.
How fast can I get the Square D PK4MB2LA 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 PK4MB2LA come with a warranty?
Absolutely. The Square D PK4MB2LA 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 PK4MB2LA?
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 PK4MB2LA from ZenSupply?
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