Square D 9421LS12 Circuit Breaker Operating Mechanism Long Shaft

Product Description

The SQUARE D 9421LS12 is a long shaft accessory for circuit breaker operating mechanisms, designed for use in electrical panel and switchgear applications. This component serves as a replacement shaft that integrates with compatible operating mechanisms to allow manual actuation of circuit breakers. At 2.08 pounds, it is a direct-fit mechanical part suited for installation by licensed electricians performing panel maintenance, equipment upgrades, or mechanism replacements in commercial and industrial electrical systems.

This long shaft is applied in scenarios where extended reach or indirect actuation of a circuit breaker is required, such as in enclosed panel sections or door-mounted operator assemblies. It pairs specifically with the 9421LF1 or LK1 operating mechanism and is appropriate for both new installations and service replacement work on existing switchgear or load center enclosures. Installation is typically performed by qualified electricians working on low-voltage distribution equipment.

Key Features

• Long shaft configuration provides extended reach for remote or indirect breaker actuation
• Designed as a direct accessory to the 9421LF1 or LK1 operating mechanism
• Compact replacement component at 2.08 pounds for straightforward field installation
• Sold individually as a single-unit package for targeted replacement needs

Compatibility

Designed for use with the SQUARE D 9421LF1 or LK1 Operating Mechanism as a direct accessory long shaft component.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the circuit before servicing any operating mechanism or breaker assembly. Verify mechanical alignment with the mating 9421LF1 or LK1 operating mechanism before securing the shaft in place. Do not force the shaft into position, as improper seating can compromise breaker actuation reliability.