the MK-3141 is the official replacement model

Its rugged construction ensures reliable thermal circuit interruption under high-cycling demands

It is not compatible with multi-stage heat pumps or 120/240V line voltage systems

The ASCO 8210G56 Solenoid Valve is a high-performance 2-way normally closed pilot-operated solution engineered for demanding industrial and commercial HVACR applications

ensuring seamless compatibility and restoring factory-spec performance for demanding contractors and service technicians

Siemens Building Technology GMA121.1U Actuator 323613-751 the MK-3141 is the officialThe Siemens GMA121. 1U is a heavy duty spring return damper actuator engineered for high demand HVACR applications requiring reliable fail safe operation. Operating on 24VAC DC, this direct coupled actuator delivers a robust 62 lb in torque (7 Nm), making it an ideal choice for managing return air, mixed air, and exhaust dampers in both constant and variable air volume systems. Built with a rugged, die cast aluminum NEMA 1 housing, this unit ensures