Schneider Electric (Barber Colman) MA-305-500 Actuator

The Schneider Electric (Barber Colman) MA-305-500 Actuator is a heavy-duty 24V spring return actuator engineered for precise two-position control in commercial HVACR systems. Delivering a rated 16 lb-in torque, this direct-coupled actuator is ideal for driving small dampers and valves that require a fail-safe return to the normal position upon power interruption. The MA-305-500 features a rugged die-cast aluminum housing with a NEMA 4 rating, providing superior protection against rain, sleet, and dust when installed with the included gasket and proper water-tight conduit fittings. Internally, the oil-immersed motor and gear train ensure consistent performance and reduced mechanical wear over long duty cycles.

This model is equipped with a built-in SPDT auxiliary switch, pre-set to make or break a circuit at the powered end of the stroke, facilitating easy status monitoring or sequencing of peripheral components. With a power consumption of 25 watts (56 VA) and 180-degree clockwise rotation when energized, it integrates seamlessly into existing low-voltage control circuits using its coded screw terminal connections. While the MA-305 series supports multi-position mounting, maintaining a horizontal output shaft position is recommended to optimize internal lubrication and extend service life in demanding field environments.

Key Benefits

• Fail-Safe Spring Return: Automatically drives the output shaft back to the original position during power loss for critical safety control.
• Integrated Auxiliary Monitoring: Includes an internal SPDT switch to eliminate the need for secondary feedback devices.
• Superior Environmental Protection: The NEMA 4 die-cast aluminum case makes it suitable for weather-protected outdoor or high-humidity installations.
• Thermal Resiliency: Rated for operation in ambient temperatures ranging from -40°F to 136°F (-40°C to 58°C).
• Maintenance-Free Internal Drive: The oil-immersed gear train provides permanent lubrication and high reliability under continuous load.

Common Questions

Is the MA-305-500 compatible with my existing linkage?
This actuator is designed to work with standard AM-series damper linkages (such as AM-111, AM-112, or AM-113) and AV-series valve linkages for Barber Colman and Schneider Electric assemblies.

Can I mount this actuator in any orientation?
Yes, the MA-305 series is not position-sensitive. However, for maximum longevity of the gear train, a horizontal output shaft orientation is technically preferred.

Does this unit support modulation?
No, this is a two-position (on/off) actuator. If your application requires a 4-20mA or 0-10Vdc signal, you will need a proportional model from the MF or MP series.

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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.