Schneider Electric (Barber Colman) MC-421 Motor

The Schneider Electric (Barber Colman) MC-421 Motor is a high-performance 120V electric actuator designed for the precise positioning of dampers and valves in commercial HVAC and industrial ventilation systems. This non-spring return actuator is engineered for two-position control, offering a full 180-degree unidirectional rotation in a standard 20-second cycle. Built for long-term duty in rigorous environments, the assembly features a rugged die-cast aluminum housing and an oil-immersed gear train that provides continuous lubrication and superior heat dissipation. For technicians handling retrofits or large-scale upgrades, the MC-421 actuator is a direct replacement for the MC-421-0-0-1, ensuring seamless mechanical and electrical compatibility without mounting modifications.

This unit integrates a built-in, cam-operated SPDT auxiliary switch, factory-set to trigger at mid-stroke for critical feedback loops or end-of-cycle signaling. Requiring a three-wire control circuit, the Barber Colman MC-421 delivers a robust 175 lb-in torque output, making it suitable for high-static pressure applications where reliability is paramount. Its NEMA 1 enclosure and dual conduit openings simplify wiring on the job site, while the non-spring return design ensures the actuator maintains its last commanded position upon signal termination, preventing unwanted mechanical stress on the linkage system.

• Unidirectional 180-Degree Rotation: Optimized for standard 20-second operation cycles to ensure consistent airflow or fluid management.
• Integrated SPDT Auxiliary Switch: Provides precise mid-stroke or end-of-stroke electrical feedback for advanced automation logic.
• Heavy-Duty Construction: Features an oil-immersed gear train and aluminum housing to withstand demanding HVACR environments.
• High Torque Output: Rated at 175 lb-in to handle large damper assemblies and valve bodies under pressure.
• Direct Compatibility: Fully interchangeable with the MC-421-0-0-1, streamlining the selection process for field technicians.

Is the MC-421 a spring return actuator?
No, this is a non-spring return actuator. It requires power to move the output shaft and will hold its current position if control power is removed.

What is the difference between MC-421 and MC-421-0-0-1?
These parts are functionally identical. The Schneider Electric MC-421 serves as the direct drop-in replacement for the legacy Barber Colman MC-421-0-0-1 model.

Can I mount this actuator in any orientation?
Preferred mounting for this 120V motor is in the upright position to ensure proper oil immersion of the gear train, though other standard positions are acceptable per manufacturer technical data.

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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.