Schneider Electric (Barber Colman) MK-3121 Actuator 30067439-890 ensuring the valve remains in

ensuring the valve remains in its last position upon loss of power

on 3-way valves

verify your furnace input rate—this kit handles units between 40

making it ideal for standard temperature regulation where cycle timing must remain consistent

making it suitable for millivolt systems and standard 24V applications

Schneider Electric (Barber Colman) MK-3121 Actuator 30067439-890 ensuring the valve remains inOptimize your pneumatic control systems with the Schneider Electric MK 3121 Actuator, a precision engineered proportional pneumatic damper actuator designed for the professional HVACR contractor. This rugged unit features a 8 to 13 PSI spring range and a versatile 2 to 4 inch adjustable stroke, allowing for exact field calibration in air handling units, mixing boxes, and VAV systems. The MK 3121 is the primary direct replacement for legacy models MK