Electrical actuator for four-way valves ZRK. Mounting kits available for connection with Viessmann valves and air dampers. For heating systems. Protection class: IP54 Supply voltage: 24 Vac Control input signal: 0/2..10V= Manual operation: Yes Runtime: 90.0 s Torque: 10 Nm Angle of rotation: 90 o End switches: optional Position indication: reversable scale plate Position feedback: optional Additional Descriptions: Manual operation by declutch of gear.