The Barber Colman MA-318-500 is a two-position electric damper actuator designed for HVAC applications requiring reliable open/close control. Operating on 24V AC, it features a spring return mechanism to ensure the actuator returns to its default position upon power loss. The integrated SPDT auxiliary switch provides additional control capabilities for system integration.
Technical Specifications
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Model: MA-318-500
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Type: Electric damper actuator
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Control Signal: Two-position (On/Off)
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Power Supply: 24V AC, 50/60 Hz
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Torque: 60 lb-in (6.8 N·m)
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Spring Return: Yes; counterclockwise to original position upon power loss
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Auxiliary Switch: SPDT; actuates at end of powered stroke
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Power Consumption: 70 Watts running, 25 Watts holding
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Rotation: 170° clockwise when powered
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Mounting Orientation: Output shaft must be horizontal
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Ambient Temperature Range: -40°F to 136°F (-40°C to 58°C)
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Enclosure Rating: NEMA Type 4 with gasket and water-tight conduit connectors
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Condition: New
Key Features
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Provides reliable two-position control for HVAC dampers
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Spring return mechanism ensures safety during power loss
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Integrated SPDT auxiliary switch for enhanced control options
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Rugged die-cast aluminum housing for durability
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Compatible with most SPST control devices
Compatible Applications
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HVAC systems requiring open/close damper control
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Ventilation and exhaust systems
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Industrial process control requiring electric actuation
Installation & Maintenance Notes
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Mount actuator with output shaft in a horizontal position
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Ensure proper alignment during installation to prevent binding
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Verify electrical connections are secure and match the actuator’s specifications
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Regularly inspect actuator for signs of wear or damage
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Follow manufacturer guidelines for maintenance procedures
We ship this product worldwide! Delivery is normally stock.
Request a Quote now or call us at 1-800-755-2883 for expert assistance