the switch opens the control circuit to prevent thermal overloading

these limiters must be installed in the upright vertical position on the top of the regulator diaphragm powerhouse

they must be purchased separately or as part of a seat kit

Can I replace a standing pilot valve with this intermittent pilot model

Auxiliary Signaling: Includes 1 NO + 1 NC contacts for local trip signaling and integration into control circuits

Schneider Electric (Barber Colman) MK4-3121 Actuator 340793-762 the switch opens the controlThe Schneider Electric MK4 3121 is a commercial grade pneumatic damper actuator engineered for precise proportional control in complex HVACR systems. Designed as a direct successor in the Barber Colman lineage, this unit features a rugged die cast aluminum housing and a high performance beaded molded neoprene diaphragm for maximum durability. It operates within an 8 to 13 psi spring range and includes a factory installed positive positioner