Siemens S55155-A108 Valve Actuator

The Siemens S55155-A108 valve actuator (SSC131.09U) is a reliable 3-position, fail-in-place Powermite MT Series actuator that replaces the SSC81U. Operating on 24 VAC with a floating control signal, it delivers 67 lbf (300 N) of positioning force and mounts directly with a coupling nut, no tools required.

Built-in manual override and LED position indication make it well suited for VAV, fan coil, unit ventilator, and chilled-ceiling terminal-unit applications.