Overview
The Allen-Bradley 1494D-N4 /A is a fixed-depth flange-mounted circuit breaker operator mechanism designed for industrial automation and motor control applications. Manufactured by Rockwell Automation, this operator mechanism provides reliable manual disconnection capability and enclosure control when integrated with compatible molded case circuit breakers.
Key Features
- Fixed-depth flange-mounted design for standard industrial enclosures
- Highly visible “On” and “Off” indicators for clear operational status
- Lockable operating handle to prevent unauthorized enclosure access while circuit is energized
- Operational auxiliary contacts for remote status indication and interlocking
- Compatible with NEMA Type 1 (IP 42) and NEMA Type 12 (IP 65) enclosures
- Factory-assembled for fast installation and minimal setup time
Technical Specifications
- Manufacturer: Allen-Bradley / Rockwell Automation
- Part Number: 1494D-N4 /A
- Product Type: Circuit Breaker Operator Mechanism
- Mounting Style: Fixed-Depth Flange Mount
- Circuit Breaker Frame Compatibility: EHD, FD, FDB, FDC, HFD, HMCP Cutler-Hammer
- Current Rating: 150 Amperes
- NEMA Enclosure Rating: Type 1 (IP 42) and Type 12 (IP 65)
- Indicators: On/Off visibility
- Handle Type: Lockable
- Features: Auxiliary contacts, mechanical interlock capability
Typical Applications
The 1494D-N4 operator mechanism is commonly used in:
- Machine Tool Control: Provides safe manual disconnection in machining centers and automated production equipment
- Automotive Manufacturing: Ensures compliance with industrial safety requirements for equipment control
- Industrial Enclosures: Enables manual circuit isolation within NEMA 1 and NEMA 12 control panels
- Motor Control Centers (MCCs): Facilitates safe breaker operation and maintenance access
- Facility Automation: Supports emergency disconnect and circuit protection in factory automation systems
Compatibility & Replacements
The 1494D-N4 operator is designed to work with Cutler-Hammer molded case circuit breakers rated at 150 amps in the following frame sizes: EHD, FD, FDB, FDC, HFD, and HMCP. This operator mechanism requires a compatible slide or bail mechanism to function—these are ordered separately based on your specific circuit breaker model. Auxiliary contact adapter kits, door hardware kits, and multiple door interlock kits are available as optional accessories. The assembly is factory-configured for immediate installation upon receipt of the proper supporting components.
