Square D QO Series Circuit Bre...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4.37
Square D QO Series Circuit Breaker Handle Clamp Accessory

Square D QO Series Circuit Breaker Handle Clamp Accessory

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Model: QO1LO

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

$4.37
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Square D QO Series Circuit Breaker Handle Clamp Accessory

The Square D QO Circuit Breaker Handle Clamp is a mini circuit breaker accessory engineered for QO and QOU Miniature Circuit Breakers. This handle clamp locks a HOM 1P breaker handle in either the ON or OFF position, giving electricians and facility staff a simple, reliable way to prevent unauthorized or accidental operation of a circuit breaker. Backed by an 18-month warranty and manufactured to Square D quality standards, this accessory is a practical addition to any QO or QOU load center.

Key Features

  • Handle Clamp Function: Holds a HOM 1P breaker handle firmly in the ON or OFF position for controlled circuit access.
  • Compatible Relationship: Designed to work with QO and QOU Miniature Circuit Breakers as a QOU accessory.
  • Range Of Product: Part of the Square D QO product range for consistent fit and performance.
  • Toxic Heavy Metal Free: Manufactured without toxic heavy metals for safer handling and disposal.
  • Mercury Free: Free of mercury content, supporting environmentally responsible electrical installations.
  • Country of Origin: Manufactured in the United States.
  • Warranty: Backed by an 18-month manufacturer warranty for added peace of mind.

Certifications & Compliance

  • RoHS Eur Compliant Status
  • Green Premium Product
  • Prop 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Technical Specifications

  • Series: QO
  • Product Group: Wiring Devices
  • Range Of Product: QO
  • Warranty Period: 18 months
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • ROHS Eur Status: Compliant
  • Country of Origin: United States

Typical Applications

  • Residential Load Centers Using QO and QOU Miniature Circuit Breakers
  • Locking Breaker Handles in the ON Position for Continuous Power
  • Locking Breaker Handles in the OFF Position for Lockout Situations
  • Panelboard Maintenance and Safety Procedures
  • Renovation and New Construction Residential Electrical Panels

Why Square D?

Square D engineers its QO accessories, including this handle clamp, to work seamlessly with QO and QOU Miniature Circuit Breakers for dependable, code-compliant performance. With a toxic-heavy-metal-free and mercury-free build, RoHS Eur compliance, U.S. manufacturing, and an 18-month warranty, this handle clamp delivers the reliability professionals expect from Square D electrical products. Whether locking a breaker ON for continuous power or OFF for a lockout procedure during panelboard maintenance, this QO Series accessory gives contractors and facility teams a straightforward, code-aware way to control access to residential load centers built around QO and QOU miniature circuit breakers, in both renovation and new construction settings.

Manufacturer Resources

Product Specs

Series:
QO
Product Type:
Circuit Breaker Accessory
Country of Origin:
United States
Standards:
RoHS Eur Compliant
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Circuit Breakers

Square D QO1LO – Frequently Asked Questions

1) What does the Square D QO1LO handle clamp actually do on a breaker?
It holds a breaker handle fixed in either the ON or the OFF position, so the breaker cannot be switched by hand without removing the clamp. Two uses in practice: locked ON where a circuit has to stay energized (life safety, refrigeration, a shared-panel tenant circuit), and locked OFF as part of a lockout during panelboard work.
2) Will the QO1LO fit my Square D QO load center breakers?
The QO1LO is built as an accessory for QO and QOU Miniature Circuit Breakers, and it clamps a HOM 1P (single-pole) breaker handle. It is a single-pole handle clamp, so it is not the part for holding a two- or three-pole handle tie.
3) Is a breaker handle clamp the same thing as a lockout device for LOTO?
Not quite the same job. A handle clamp like the QO1LO mechanically restrains the handle in position and is listed for lockout situations during panelboard maintenance, but a full LOTO program still wants a padlock and tag applied per your site procedure. Where the clamp earns its place is the ON-lock case a padlock hasp cannot cover: keeping a critical circuit from being shut off accidentally.
4) What part number do I order for the Square D QO single-pole handle clamp?
Order Square D QO1LO. That is the manufacturer part number for the QO series single-pole handle clamp.
5) Does this Square D handle clamp meet RoHS and heavy-metal restrictions for our facility spec?
The QO1LO is RoHS Eur compliant, built without toxic heavy metals, and mercury free. It also carries a Prop 65 warning for cancer and reproductive harm. Country of origin is the United States, which matters if you are buying to a domestic-preference or Buy American-leaning spec.
6) I manage apartments and want critical circuits left alone by tenants. Is this the right accessory?
For a QO or QOU load center, yes, that is exactly the ON-lock case: the clamp holds a single-pole handle in the ON position so a tenant or contractor cannot casually flip a sump pump, alarm, or heat-trace circuit off. Buy one clamp per breaker handle you want held.
7) Can an ABB Pro-Stak stacking kit be used in place of the Square D QO1LO handle clamp?
No. The QO1LO is a handle clamp that holds a HOM 1P breaker handle in the ON or OFF position on QO and QOU miniature circuit breakers. The ABB MBA1 Series Pro-Stak A2 kit is a stacking kit for molded case circuit breakers, which is a mounting accessory rather than a handle-position device, and it is built around ABB's MBA1 breaker line. They serve different jobs on different equipment, so one does not stand in for the other.
8) I need a sub-feed breaker accessory for a panel, not a handle lock - is the QO1LO the right part?
No. The QO1LO is a circuit breaker accessory whose only function is clamping a 1-pole breaker handle in the ON or OFF position for lockout or continuous-power situations. For a sub-feed arrangement, the ABB XT4 Pro-Stak 6-pole sub-feed circuit breaker accessory kit is the type of part that addresses that, though it is an ABB XT4 series product and will not mount in a QO or QOU load center.
9) We standardize on ABB gear in our commercial panels - does the QO1LO fit any of it?
The QO1LO is built to the Square D QO range and works with QO and QOU miniature circuit breakers, so it is not an ABB-compatible part. ABB breaker accessories in the same general family, such as the MBA1 Series Pro-Stak A2 stacking kit and the XT4 Pro-Stak 6-pole sub-feed kit, are tied to their own ABB breaker series. Accessory selection follows the breaker line in the panel rather than crossing between manufacturers.
How fast can I get the Square D QO1LO 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 QO1LO come with a warranty?
Absolutely. The Square D QO1LO 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 QO1LO?
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 QO1LO from ZenSupply?
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