Square D 9421LW1 Operating Mechanism 1000A 600V

Product Description

The SQUARE D 9421LW1 is a 1,000-amp circuit breaker operating mechanism designed for use with PowerPact M or P Frame circuit breakers rated at 600 volts control voltage. This accessory provides the external mechanical actuation interface that allows manual or remote operation of the host breaker assembly. It is a direct-mount component installed by licensed electricians during initial panel builds or in-service breaker upgrades in commercial and industrial distribution systems. The mechanism is a load-bearing assembly, weighing 10.26 pounds, and fits within a defined dimensional envelope suited to breaker compartment specifications.

This operating mechanism is applied in medium- to large-scale electrical distribution installations where PowerPact M Frame or P Frame breakers are deployed. Typical use cases include industrial motor control centers, commercial switchgear lineups, and heavy-duty panelboard assemblies operating at up to 600 volts. It is suited for facilities requiring frequent or remote breaker actuation without direct hand access to the breaker itself. The part is packaged individually and is intended for single-unit replacement or new installation applications.

Key Features

• Rated for 1,000-amp breaker frames at up to 600 volts control voltage
• Compatible with PowerPact M Frame and P Frame circuit breakers
• Direct OEM accessory for accurate mechanical fit and actuation alignment
• Compact dimensional profile: 13.3 inches length, 9.2 inches width, 10.6 inches height
• Weighs 10.26 pounds — substantial construction suited to high-ampacity applications
• Packaged as a single unit for straightforward one-for-one replacement

Compatibility

Designed for use with SQUARE D PowerPact M or P Frame circuit breakers, as specified by the manufacturer.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the circuit before beginning any work on the breaker or its accessories. Verify that the operating mechanism model matches the exact frame designation of the host breaker prior to mounting. Do not force-fit the mechanism or operate the breaker under load without confirming the mechanism is fully seated and secured.