Schneider Electric 9421LJ4 Circuit Breaker Operating Mechanism

Product Description

The SCHNEIDER ELECTRIC 9421LJ4 is a door-mounted, variable-depth circuit breaker operating mechanism designed for H/J frame 250-ampere circuit breakers. Part of the Square D Class 9421 Type L series, it allows safe external operation of the breaker without opening the enclosure. The mechanism uses a 6-inch rotary lever handle connected to the breaker via a long shaft, available in a standard 10.75-inch or long 21.63-inch shaft length. Construction is all-metal and heavy duty, with built-in trip indication so technicians can confirm breaker status at a glance. Licensed electricians and industrial maintenance personnel are the primary installers for this type of accessory.

This operating mechanism is rated for NEMA 1, 3R, and 12 enclosures, making it suitable for indoor general-purpose, outdoor rainproof, and dust-tight applications. The right-side handle mounting location and long shaft configuration accommodate variable enclosure depths common in industrial and commercial panel installations. It is well suited for motor control centers, distribution panels, and switchgear enclosures where remote breaker operation through a closed door is required by code or safety protocol.

Key Features

• 6-inch rotary lever handle included; no separate handle purchase required
• Long shaft connection accommodates standard 10.75-inch and long 21.63-inch shaft depths
• All-metal, heavy-duty construction with trip indication for quick status confirmation
• Padlockable in the OFF position with up to three padlocks when enclosure door is open, simultaneously locking the door closed
• Compatible with NEMA 1, 3R, and 12 enclosures for indoor and outdoor rainproof or dust-tight installations
• Right-side handle mounting location suits standard door-mount configurations

Compatibility

Designed for use with H/J frame 250-ampere circuit breakers in NEMA 1, 3R, and 12 rated enclosures. Part of the Square D Class 9421 Type L door-mounted variable-depth operating mechanism series.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements and the enclosure manufacturer guidelines. De-energize and lock out the circuit before mounting or adjusting the operating mechanism or connecting the shaft to the breaker. Verify shaft length selection matches the actual door-to-breaker depth before final assembly. Do not force the rotary lever if the breaker is in a tripped state; clear the fault and reset the breaker through proper procedure before re-closing.

Technical Specifications

• Handle Type: 6 Inch Rotary Lever
• Handle Included: Yes
• Breaker Type: H/J Frame 250 Ampere
• Handle to Device Connection: Long Shaft
• Standard Shaft Length: 10.75 inches
• Long Shaft Length: 21.63 inches
• Handle Mounting Location: Right
• Number of Poles: 3
• Enclosure Rating: NEMA 1/3R/12
• Package Dimensions: 20.11 inches L x 10.70 inches W x 10.10 inches H
• Package Weight: 6.67 pounds
• Country of Origin: Mexico
• Warranty: 18 months

Standard Information

• Brand: SCHNEIDER ELECTRIC
• Manufacturer Part Number: 9421LJ4