Square D 9421LH43 Circuit Breaker Operating Mechanism Handle

Product Description

The SQUARE D 9421LH43 is a replacement operating mechanism handle designed for use with compatible Square D circuit breaker operating mechanisms. This handle serves as the external actuator that allows operators to manually open, close, or trip the associated circuit breaker from outside the enclosure. It is a direct-fit accessory intended for industrial and commercial electrical panel applications. Licensed electricians and panel service technicians install this component as part of operating mechanism maintenance or replacement. At 2.09 pounds and compact in form, the 9421LH43 integrates with the operating mechanism assembly to provide reliable manual control of the breaker.

This handle is specifically designed for use with the following Square D operating mechanisms: 9421LG7, LF1, LK1, and LJ7. It is suited for industrial control panels and electrical distribution equipment where manual breaker actuation is required from the panel exterior. This type of accessory is commonly found in commercial buildings, light industrial facilities, and machine control enclosures where NEC-compliant lockout and manual override capability is necessary.

Key Features

• Direct-fit replacement handle for 9421LG7, LF1, LK1, and LJ7 operating mechanisms
• Enables manual open, close, and trip operation of the associated circuit breaker
• Compact form factor at 6.9 x 6.2 x 4.4 inches for enclosure-mounted installations
• Sold individually as a single-piece accessory
• Lightweight at 2.09 pounds for straightforward field installation

Compatibility

Designed for use with the Square D 9421LG7, LF1, LK1, and LJ7 circuit breaker operating mechanisms.

Installation Notes

Installation should be performed by a licensed electrician following applicable NEC requirements. De-energize and lock out the circuit before servicing any breaker operating mechanism or its handle assembly. Verify the handle model matches the installed operating mechanism before disassembly. Do not force the handle into position if resistance is encountered, as improper fitment can compromise breaker operation.