Siemens 3.4Nm GRD Series Fire & Smoke Damper ActuatorsSiemens Electronic motor driven actuators for Fire and Smoke Dampers Nominal torque 3. 4 Nm (GRD) Optional built in auxiliary switches with fixed switch points at 5C and 85 rotation Pre wired with 0. 9 m long connection cables Position indicator UL Listed For damper areas up to 0. 8 m2 (GRD) 30 second drive operation at rated torque, temperature and voltage < or = 15sec spring return Suitable for use with Integrated Electronic Fusible Link (EFL) with