Schneider Electric (Barber Colman) MK-3141 Pneumatic Damper Actuator

When the job requires a drop-in Schneider Electric (Barber Colman) MK-3141 Pneumatic Damper Actuator, tech reliability is the only metric that matters. This proportional linear actuator is the direct replacement for the legacy MK-3140, engineered for modulating control of HVAC dampers and mixing boxes. Featuring a rugged die-cast aluminum housing and a beaded molded neoprene rolling diaphragm, it manages a 3 to 13 psi spring range with a field-adjustable stroke of 2 to 4 inches. The spring return fail-safe ensures the actuator shaft retracts immediately upon loss of pneumatic pressure, maintaining system safety in critical air handling applications.

Built for the rigors of commercial mechanical rooms, the MK-3141 pneumatic actuator handles a maximum air pressure of 30 psig and operates via standard 1/8" FNPT air connections. With an 8 sq. in. effective diaphragm area, it delivers the consistent torque required for proportional damper control. This unit is designed to interface seamlessly with existing pneumatic control systems, providing a robust solution for contractors servicing aging Barber Colman infrastructure or installing new Schneider Electric specified air-side components.

• Direct Replacement: Seamlessly upgrades obsolete MK-3140 units with identical mounting footprints.
• Adjustable Performance: Stroke length is versatile from 2" to 4" to match specific damper linkage requirements.
• Pneumatic Fail-Safe: Reliable spring-return mechanism ensures a known safe state during pressure drops.
• Durable Construction: Cast aluminum body and high-grade neoprene components withstand industrial environments.

Common Questions

Is the MK-3141 a direct replacement for the MK-3140?
Yes, the MK-3141 is the official replacement model. It maintains the same 1/8" FNPT connections and mounting configurations required for standard HVAC damper retrofits.

Can I adjust the starting point of the spring range?
The spring range is factory-set at 3 to 13 psi, and the starting point is typically adjustable by ±1 psi on this series to fine-tune the modulation sequence.

What maintenance is required for the internal diaphragm?
The neoprene rolling diaphragm is built for longevity, but should be inspected during routine PMs for cracks or leaks. Ensure the air supply is filtered and dry to prevent contaminants from degrading the seal.

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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.