Schneider Electric (Barber Colman) M574-5211 Actuator

The Schneider Electric M574-5211, formerly under the Barber Colman brand, is a heavy-duty piston pneumatic actuator engineered for precise control of dampers and valves in commercial HVAC environments. This unit features a 4-inch stroke and a 8 to 13 psig spring range, providing reliable mechanical force for proportional air volume control. Designed for right-angle mounting, this assembly includes a complete hardware kit comprising a mounting bracket, ball joint, push rod, and crank arm compatible with a 1/2-inch damper shaft. On a loss of signal or air pressure, the internal return spring ensures the actuator shaft retracts to its fail-safe position. Operating at a 20 psig nominal supply pressure, it connects via a barbed fitting for standard 1/4-inch O.D. plastic tubing. For technicians replacing legacy components, this model is a direct functional equivalent to the Barber Colman 2474-140 and MK-574-51, ensuring a drop-in fit without extensive field modifications.

Key Benefits

• Direct Replacement Compatibility: Seamlessly replaces 2474-140 and MK-574-51 pneumatic units, maintaining system calibration.
• Complete Installation Kit: Includes crank arm and push rod for immediate 1/2" damper shaft integration.
• Mechanical Fail-Safe: Reliable retract-on-loss-of-pressure spring action protects sensitive air handling equipment.
• Robust Construction: Engineered with a piston-type design for sustained 4-inch travel in high-static environments.
• Standard Connectivity: Features 1/4-inch barbed fittings for quick integration with existing pneumatic control loops.

Common Questions

Does the M574-5211 come with the necessary mounting hardware?
Yes, this assembly is a complete kit including the right angle mounting bracket, ball joint, push rod, and crank arm specifically for 1/2-inch damper shafts.

What is the failure position of this pneumatic actuator?
The M574-5211 is designed to fail-safe by retracting the actuator shaft when air pressure is removed or lost, utilizing its internal 8 to 13 psig spring.

Can I use this model to replace an MK-574-51?
Yes, the Schneider Electric M574-5211 is the direct technical successor and is functionally identical to the Barber Colman MK-574-51 and 2474-140.

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.