Schneider Electric 9421LW4 Circuit Breaker Operating Mechanism

Product Description

The SCHNEIDER ELECTRIC 9421LW4 is a door-mounted, variable-depth circuit breaker operating mechanism designed for use with M/P Frame 1200 ampere breakers. It features an 8-inch rotary lever handle with a variable-depth shaft that adjusts from 7.2 to 22.25 inches, allowing installation across a range of enclosure depths without custom hardware. The mechanism is rated for NEMA 1/3R/12 enclosures, meaning it is suitable for general indoor use, rainproof, and dusttight applications. All-metal construction provides durability in demanding industrial and commercial environments. Licensed electricians install this accessory as part of a complete panelboard or switchboard assembly.

This operating mechanism is intended for industrial and commercial electrical distribution systems where a breaker must be operated from outside a closed enclosure door. The right-side handle mounting location and 3-pole configuration make it appropriate for three-phase power distribution panels. The Class 9421 Type L series is commonly used in manufacturing facilities, commercial buildings, and utility rooms where M/P Frame breakers are installed in NEMA 1/3R/12 enclosures. The handle assembly mounts to the enclosure door and connects to the breaker via a variable-depth shaft, keeping personnel clear of live components during operation.

Key Features

• 8-inch rotary lever handle included, mounted on the right side of the enclosure door
• Variable-depth shaft adjusts from 7.2 to 22.25 inches to accommodate different enclosure depths
• All-metal, heavy-duty construction with trip indication
• Can be padlocked in the off position when the enclosure door is open
• Handle assemblies accept up to three padlocks, which also lock the enclosure door closed
• Rainproof and dusttight construction rated for NEMA 1/3R/12 enclosures

Compatibility

Designed for use with M/P Frame 1200 ampere circuit breakers installed in NEMA 1/3R/12 enclosures. Compatible with Class 9421 Type L door-mounted operating mechanism applications as noted in the product series data.

Installation Notes

Installation must be performed by a qualified, licensed electrician in accordance with applicable NEC requirements. De-energize and lock out the circuit before beginning any work on the breaker or operating mechanism. The variable-depth shaft must be adjusted and secured to match the actual door-to-breaker distance before operation. Verify that the padlocking hardware is fully engaged before returning the enclosure to service.

Technical Specifications

• Handle Type: 8 Inch Rotary Lever
• Handle Mounting Location: Right
• Handle Included: Yes
• Handle to Device Connection: 7.2 to 22.25 inches variable depth shaft
• Breaker Type: M/P Frame 1200 Ampere
• Number of Poles: 3
• Enclosure Rating: NEMA 1/3R/12
• Constructional Feature: Rainproof, Dusttight
• Warranty: 18 months
• Package Dimensions: 19.6139 inches L x 12.3825 inches W x 11.1938 inches H
• Package Weight: 12 pounds
• Country of Origin: Mexico

Standard Information

• Brand: SCHNEIDER ELECTRIC
• Manufacturer Part Number: 9421LW4