The Barber Colman MA-305-500 is a heavy-duty two-position damper actuator designed for use in demanding HVAC and industrial environments. Built for compatibility with most SPST control devices, this actuator provides dependable open/close operation with a spring return feature for fail-safe positioning. The “-500” model includes a built-in SPDT auxiliary switch for end-of-travel signaling or control logic, and features an oil-immersed motor and gear train for quiet, durable operation.
Technical Specifications
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Model: MA-305-500
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Type: Two-Position Damper/Valve Actuator
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Control Type: SPST (On/Off)
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Return Type: Spring Return
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Voltage Options: 24 VAC, 120 VAC, 208 VAC, and 240 VAC
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Auxiliary Switch: Built-in SPDT (adjustable)
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Motor Type: Oil-immersed motor with gear train
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Housing:
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Standard: Die-cast aluminum with two 1/2″ conduit openings
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Hazardous Location Model: Two 3/4″ pipe-tapped openings for rigid metal conduit
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Mounting: For use with damper or valve linkage kits
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Condition: New
Key Features
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Compatible with most SPST controllers for simple open/close actuation
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Spring return mechanism ensures automatic repositioning on power loss
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Built-in SPDT auxiliary switch for position feedback or interlock control
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Quiet and smooth movement from oil-immersed motor and gear assembly
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Rugged housing for harsh indoor or hazardous area installations
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Supports various voltage options for flexible application use
Compatible Applications
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HVAC damper systems and ventilation control
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Boiler draft control and flue gas dampers
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Valve actuation in industrial process systems
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Combustion air systems
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Flame safety and burner control panels
Installation & Maintenance Notes
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Choose voltage model that matches your control system
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Mount securely with compatible damper or valve linkage
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Confirm SPDT switch adjustment and test contact functionality
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Use correct conduit fittings for standard or hazardous location models
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Periodically inspect motor oil integrity, switch terminals, and housing seals
We ship this product worldwide! Delivery is normally stock.
Request a Quote now or call us at 1-800-755-2883 for expert assistance