Siemens SSC61U Valve Actuator

The Siemens SSC61U Valve Actuator is a 24 V electronic, non-spring-return actuator in the Powermite MT-Series family, delivering precise, proportional control of valve positions via a 0–10 VDC control signal. It operates from a 24 VAC (or 24 VDC) supply and converts the control input into a 7/32 inch (5.5 mm) stroke, designed to fit Powermite 599 MT valves with a threaded bonnet. In literature, the SSC61U is listed with the S55155-A110 designation, and it is intended for non-spring return installations where the actuator is used with Siemens MT-series valve bodies. This actuator is commonly employed in HVAC zoning, building automation, and hydronic systems to modulate flow with a 0–10 V input from a BAS or controller.