Siemens SAS81.03U POWERMITE 599 MT SERIES SAS ELECTRONIC VALVE ACTUATOR, NSR, 24V, FLOAT CONTROLSiemens SAS81. 03U Powermite 599 MT Series SAS Electronic Valve Actuator, NSR, 24V, Float Control The Powermite 599 MT Series SAS Electronic Valve Actuator requires a 24V supply and receives a floating control signal to provide three position control of a valve. The non spring return actuator works with Powermite 599 MT Series terminal unit valves with a 7 32 in. stroke. Additional Information Fail SafeNo Spring return functionNon spring return