Description
The Schneider Electric (Barber Colman) MP-481 is a heavy-duty proportional actuator engineered for precise damper and valve control in commercial HVAC and building automation applications. Delivering 220 lb-in of torque at 120 V, this non-spring-return actuator provides reliable, repeatable positioning across a full 180-degree rotation arc — making it well-suited for large dampers, butterfly valves, and other high-torque applications where accurate modulating control is essential.
With a 130-second timing cycle under no-load conditions, the MP-481 moves smoothly through its full stroke, minimizing system shock and ensuring stable control response. The integrated SPDT auxiliary switch provides end-of-travel feedback or can be used to trigger additional control sequences, adding versatility to complex building automation and energy management systems.
Key Features
- Operating Voltage: 120 V AC
- Torque Output: 220 lb-in
- Timing: 130 seconds (no load, full stroke)
- Rotation: 180 degrees
- Return Type: Non spring return
- Auxiliary Switch: SPDT included
- Control Type: Proportional (modulating)
Applications
- Commercial HVAC damper control
- Butterfly valve and ball valve actuation
- Building automation and energy management systems
- Air handling unit (AHU) damper positioning
- VAV and mixed-air control systems
Why Choose the MP-481?
The MP-481’s proportional control mode allows it to respond continuously to a modulating control signal, positioning the actuator precisely where the system demands — not just open or closed. The non-spring-return design retains the last commanded position on power loss, which is ideal for applications where fail-in-place operation is preferred. The built-in SPDT auxiliary switch adds end-of-travel signaling capability without the need for external components, streamlining installation and wiring.
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