Siemens SAS61.03U MT SERIES SAS ELECTRONIC VALVE ACT, NSR, 24V, 0-10V / 4-20 MA PROPORT CONTROLSiemens SAS61. 03U MT Series SAS Electronic Valve Act, NSR, 24V, 0 10V 4 20 mA Proport Control The Powermite 599 MT Series SAS Electronic Valve Actuator requires a 24V supply and receives a 0 10Vdc or 4 to 20 mA control signal to proportionally control 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