Schneider Electric MK-7121 Pneumatic Damper Actuator, 8-13 PSI, 20 Sq In

Description

The Schneider Electric (Barber Colman) MK-7121 is a heavy-duty pneumatic damper actuator engineered for reliable, precise damper control in commercial HVAC and building automation systems. With a 20 square inch actuator area and an 8 to 13 PSI spring range, it delivers consistent positioning force across a wide range of pneumatic control applications. The spring-return design automatically retracts the crank arm upon loss of air pressure, providing a built-in fail-safe mechanism that protects your system and maintains safe damper positioning during air supply interruptions.

Key Features

• 8 to 13 PSI spring range for reliable pneumatic actuation
• 20 square inch actuator for strong, consistent positioning force
• 30 PSIG maximum air pressure rating
• Spring-return safety action: retracts crank arm on loss of air pressure
• 4″ to 5″ adjustable stroke for flexible installation and damper compatibility
• 1/8″ FNPT air connection for easy pneumatic line integration
• Designed as a direct replacement for legacy Barber Colman MK-7121 actuators

Specifications

• Model: MK-7121
• Brand: Schneider Electric (Barber Colman)
• Actuator Type: Pneumatic, Spring-Return
• Spring Range: 8 to 13 PSI
• Maximum Air Pressure: 30 PSIG
• Actuator Area: 20 Square Inches
• Stroke: 4″ to 5″ (Adjustable)
• Air Connection: 1/8″ FNPT

Applications

• Commercial HVAC damper control
• Building automation and pneumatic control systems
• VAV and AHU damper positioning
• Retrofit and replacement of existing Barber Colman pneumatic actuators

The MK-7121’s adjustable 4″ to 5″ stroke makes it adaptable to a variety of damper linkage configurations, reducing installation time and the need for additional hardware. The 1/8″ FNPT air port ensures compatibility with standard pneumatic tubing and fittings used throughout commercial building systems. Whether you’re upgrading an aging pneumatic control system or replacing a failed actuator, the Schneider Electric MK-7121 delivers the dependability and performance that HVAC professionals demand.