Schneider Electric (Barber Colman) MA-305 Actuator

The Schneider Electric (Barber Colman) MA-305 is a robust, heavy-duty two-position actuator engineered for precise on-off control in commercial HVAC systems. Operating on 24V power with a power consumption of 25 Watts, this oil-immersed motor delivers 16 lb-in torque suitable for driving dampers, valves, and specialized sequencing controllers. This unit serves as the certified direct replacement for ADDB-1, MA-305-0-0-2, and MA-305-0-0-3 legacy models, ensuring seamless integration into existing Barber Colman actuator assemblies. The hydraulic thermal action provides consistent force while allowing for mounting in any orientation, though the horizontal output shaft position is preferred for optimal long-term lubricant distribution. Designed for reliability in demanding environments, the MA-305 integrates into standard 24V HVAC control circuits, providing high-torque actuation for air handling units and zone management applications where fail-safe performance is required.

• Field Versatility: Engineered for multi-position mounting, simplifying retrofits in tight mechanical spaces.
• Direct Retrofit Compatibility: Replaces discontinued ADDB-1 and MA-305 series models without the need for additional mounting hardware or wiring modifications.
• Enhanced Durability: Features an oil-immersed gear train to minimize internal friction and heat buildup during continuous duty cycles.
• Standardized Voltage: Operates on common 24 VAC power, making it compatible with a wide range of building automation systems (BAS).

Is the MA-305 compatible with floating or proportional control signals?
No, this is a dedicated two-position actuator designed for full open or full closed operation and does not support 0-10V or 4-20mA modulating inputs.

Can I mount this actuator vertically?
Yes, the unit is rated for installation in any position; however, technicians recommend the horizontal output shaft position to ensure maximum internal component lubrication.

Does this unit replace the old Barber Colman ADDB-1?
Yes, the Schneider Electric MA-305 is the direct spec-for-spec replacement for the ADDB-1 and all MA-305-0-0-X variants.

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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.