Schneider Electric MK-3121 Pneumatic Damper Actuator

Schneider Electric MK-3121 Pneumatic Damper Actuator is engineered for precise, reliable damper control in HVAC systems. This Linear actuator utilizes die-cast aluminum housing to deliver robust performance in tight spaces.

With overall dimensions of 5-7/8 in width, 5-1/2 in depth, and 12 in height, it fits standard damper assemblies. The end connection is 1/8" female threaded air, and the unit operates from a 30 PSIG supply.

The diaphragm is neoprene with an 8 in² area, and the nominal spring range is 8–13 PSIG, delivering responsive, proportional positioning from a 2-Position (On/Off) control signal.

Designed for tough environments, it carries NEMA 1 protection and operates across -20 to 160°F ambient temperatures.

• Type: Linear pneumatic damper actuator
• Body: Die-cast aluminum
• Air connection: 1/8" female threaded
• Control: 2-Position On/Off, proportional
• Torque: 7 in-lb @ 15 PSI; 21 in-lb @ 20 PSI
• Pressure rating: 30 PSIG
• Diaphragm: Neoprene, 8 in²; 8–13 PSIG spring range