Power supply: 24 Vac ±20%, 50-60 Hz, 24 Vdc ±20% Power Consumption: Running: 2 W @ rated torque At rest: 0.2 W For wire options: 0.4 VA Connection cable: 1 m (3.3 ft), 3 x 0.75 mm² (AWG 18) Maximum angle of rotation: 95° (adjustable by mechanical stop) Minimum torque: 20 Nm (180 in. lb.) @ rated voltage Run time or duty cycle: 150 s Direction of rotation: Reversible via switch Position indication: Mechanical Standards Compliance: EMC, emission: according to SS EN 50081-1 EMC, immunity: according to SS EN 50082-1 Protection class: Enclosure rating: Class III safety extra low voltage IP rating: IP 54 Ambient humidity: 95% r.H (EN 60730-1) Ambient temperature: Operating: -30...+50 °C (-22...+122 °F) Storage: -40...+80 °C (-40...+176 °F) Maximum sound power level: 45 dB (A) Maintenance: Maintenance-free Weight: approx. 1 kg (2.2 lb.) Product description: The MD20B series damper actuator is used as an air control damper in ventilation and air conditioning systems for building services. Suitable for air control dampers up to approx. 4 m² (4.8 yard²). Torque 20 Nm (180 in. lb.) Rated voltage 24 Vac/dc Control: On/Off or 3-point control Features: Can be mounted directly to the damper shaft with a universal shaft clamp and is equipped with an anti-rotation strap to prevent actuator rotation. Can be manually operated with a self-resetting button (gear lock remains disengaged as long as button is pressed or locked). Adjustable rotation angle by means of mechanical end stops. High functional reliability: actuator overload protection without limit switches, automatic stop on reaching the terminal block.