Belimo Actuator Open/Close Fail-Safe NO 24VAC/DC 2.5Nm IP42 75s TRF24-O

This Belimo electrical actuator is designed for controlling quarter turn valves. The actuator delivers a torque of 2.5 Nm and can open/close the valve in 75 seconds. This actuator requires a supply voltage of 24 V AC/DC and has a visual positioning indicator to clearly see the valve position. The actuator features two-point (open-close) control. The actuator simultaneously positions the valve for operation while tensioning the return spring. If the supply voltage is cut off, the spring force returns the valve to its open position. The actuator has a durable plastic housing and has an IP42 protection rating. This actuator can operate within ambient temperatures between -30 and 50 °C (-22 and 122 °F). The actuator comes with a 1-meter power cable.

To manually change the position, press and hold the override button, then turn the lever. The actuator is equipped with overload protection, the actuator doesn't need limit switches and will stop automatically when the end stop is reached. The actuator can be directly mounted on the ball valve using a single screw. The mounting orientation relative to the ball valve can be chosen in 90° increments. The actuator simultaneously moves the valve to the operating position and tensions the return spring. If the power source is cut off, the valve reverts to the fail-safe position driven by the spring force.

Pros:

• The actuator is equipped with a fail-safe feature
• Visual position indicator

Cons:

• The time to open/close of 75 s is slow for some applications