Siemens 7Nm GMA Series Fail Safe Damper ActuatorsSiemens Electronic motor driven actuators for two position, three position, and modulating control. Nominal torque 7 Nm, with spring return, self centering shaft adapter Mechanically adjustable span between 0 90 Prewired with 0. 9 m long connection cables. Type specific variations with adjustable offset and span for the positioning signal, position indicator, feedback potentiometer and adjustable auxiliary switches for supplementary functions. For