Schneider Electric (Barber Colman) MC-431-126 Motor

The Schneider Electric (Barber Colman) MC-431-126 is a heavy-duty 120V electric rotary actuator engineered for continuous duty in demanding HVAC and industrial control environments. This unidirectional motor delivers a robust 220 lb-in torque, making it a reliable solution for the two-position operation of dampers and valves where a fail-safe return-to-normal position is not required. Designed with a rugged die-cast aluminum housing and an oil-immersed gear train, the MC-431-126 motor ensures long-term performance in high-cycle applications. It features a standard internal SPDT auxiliary switch, factory-set to toggle at mid-stroke, providing essential feedback for system sequencing. This non-spring return actuator is a direct replacement for legacy Barber Colman systems, maintaining system compatibility and ensuring seamless integration into existing 120 VAC three-wire control circuits. Contractors rely on this unit for its durability in hazardous duty ratings and its precise 180-degree stroke capability.

Key Benefits:

• High Torque Output: Provides 220 lb-in of torque to handle large damper assemblies and high-pressure valve bodies.
• Continuous Rotation Design: Engineered for continuous motor operation, reducing wear during high-frequency cycling.
• Industrial Durability: Features a die-cast aluminum housing and oil-immersed gears for superior thermal management and mechanical longevity.
• Auxiliary Feedback: Includes a built-in SPDT switch, allowing for easy interlocking with fans, pumps, or additional controllers.
• Installation Versatility: Equipped with multiple conduit openings (1/2" for standard and 3/4" for hazardous duty locations) to suit various job site requirements.

Common Questions:

Is the MC-431-126 a spring-return motor?
No, this is a non-spring return actuator. It is designed for two-position control where the actuator remains in its last position or completes its stroke without a mechanical return spring.

What type of controller is required for this actuator?
The Schneider Electric MC-431-126 requires a three-wire control circuit, typically powered by an SPDT snap-acting switch, thermostat, or relay.

Can the auxiliary switch be adjusted?
Yes, the internal SPDT auxiliary switch is cam-operated and can be adjusted, though it comes factory-set to trigger at the mid-stroke position.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.