Sun Yeh's explosion-proof spring return fail-safe actuators are structured as flame-proof and combustible dust-proof and torque range is from 50Nm~260Nm.
When power is present, the spring mechanism is compressed and the actuator will drive until it reaches the end of travel setting. If power is lost, the spring mechanism will be released to return the actuator to either fully open or fully closed position.
This actuator can be used in tunnel ventilation damper, smoke extraction and fire protection and so on.
Visit Sun Yeh at the
Fire & Safety Expo, a concurrent show in Secutech 2019 from May 8-10 in Taipei, Taiwan.