A-B 140MT-D9N-C40 Motor Protection Circuit Breaker

Product Description

The Allen-Bradley 140MT-D9N-C40 is a high-performance motor circuit protector designed to provide magnetic short-circuit protection in industrial motor control systems. It features a fixed magnetic trip setting and is designed to be used with a compatible contactor and a separate overload relay.

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Technical Specifications

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Key Features and Advantages

• Magnetic Short-Circuit Protection: Trips rapidly when a qualifying short-circuit current is detected.

• 40 A Rating: Suitable for properly selected motor control applications.

• Fixed Trip Setting: Provides a defined magnetic trip threshold.

• Compact Design: Integrates into compatible industrial motor starter assemblies.

• Contactor Compatibility: Designed for use in approved combinations with compatible Allen-Bradley contactors.

Typical Applications

• Industrial motor control panels

• Pumps and fans

• Conveyor systems

• Manufacturing machinery

• Three-phase motor starter assemblies

Installation and Ordering Precautions

1. Confirm the full catalog number 140MT-D9N-C40.

2. Verify motor current, supply voltage, and short-circuit ratings for the intended application.

3. This model is a motor circuit protector, not a complete thermal overload relay.

4. Install a separate overload protection device as required by the motor starter design.

5. Select compatible contactors and follow Rockwell Automation's coordination and wiring instructions.

6. Installation should be performed by qualified electrical personnel.