Overview
The Square D 9421LJ /A operating mechanism is a Type L door-mounted variable depth rotary handle assembly designed for industrial control panel installations. This model features robust all-metal construction with trip indication for visual status verification, making it an essential component for circuit breaker control and disconnect applications.
Key Features
- Type L door-mounted design with variable depth accommodation
- Heavy duty all-metal construction with trip indication
- Rotary handle operation with padlock capability in OFF position
- NEMA 1/3R/12 environmental rating
- Direct mount handle positioning for flexible installation
- 6 inch handle length for accessible operation
Technical Specifications
- Mechanism Type: Type L Door-Mounted Variable Depth Operating Mechanism
- Rated Voltage: 600 VAC
- Rated Current: 250 Amps
- Handle Operation: Rotary Handle
- Handle Length: 6 inches
- NEMA Rating: NEMA 1/3R/12
- Mounting: Direct Mount (Variable Depth 5.5 to 21.38 inches)
- Shaft Type: Standard Shaft
- Construction: All-Metal with Trip Indication
- Certifications: UL Component Recognized, CSA Certified
- Series: 9421L
Typical Applications
The Square D 9421LJ /A is commonly used in:
- Control panel door-mounted disconnect switch assemblies
- PowerPact H and J circuit breaker operator installations
- Industrial machinery control enclosures
- MG-NSF 250A circuit breaker systems
- Multi-pole (2 or 3 pole) breaker applications requiring padlock-off safety capability
Compatibility & Replacements
Compatible With
- PowerPact H frame circuit breakers (2 or 3 pole)
- PowerPact J frame circuit breakers (2 or 3 pole)
- MG-NSF 250A rated circuit breakers
- Compact NSF circuit breakers
- Square D Type L door-mounted enclosure systems
- Industrial control panels rated for 250A @ 600VAC
Replaces / Drop-In Replacement For
The 9421LJ /A is part of the Square D 9421L series operating mechanism family and is directly compatible with systems designed for standard shaft, Type L door-mounted mechanisms rated 250A/600VAC.
Works With
- PowerPact circuit breaker families (H and J frame)
- Square D disconnect switches and motor starters
- Industrial control enclosures with variable depth mounting (5.5 to 21.38 inch range)
- Padlock-off safety systems in compliance with OSHA lockout/tagout requirements
