Belimo SRF24A-O - rotary actuator for ball valves
Rotary actuator for ball valves with spring-return fail-safe function. The motor and spring torque is 20 Nm, the rated voltage is AC/DC 24 V, and the control is of the Close/Open type.
When the power supply fails, the spring sets the valve to the open position (NO). The motor running time is 75 s / 90°, and the degree of protection is IP54.
Belimo SRF24A-O – actuator for ball valves
Rotary actuator with spring-return fail-safe function. During operation, the actuator moves the valve and tensions the spring; when the power supply is interrupted, the spring moves the valve to its fail-safe position. For this model, this is the open position (NO).
Main features and specifications
- Motor torque: 20 Nm; spring torque: 20 Nm.
- Rated voltage: AC/DC 24 V; frequency: 50/60 Hz.
- Rated voltage range: AC 19.2...28.8 V / DC 21.6...28.8 V.
- Control: Close/Open.
- On power failure: NO, valve open (A–AB = 100%); for valves with an L-port: A–AB = 0%.
- Motor running time: 75 s / 90°. Fail-safe function operating time: <20 s @ -20...50°C, <60 s @ -30°C.
- Power consumption during operation: 5.5 W; in standby: 1.5 W; for wire sizing: 7.5 VA.
- Power and control connection: 1 m cable, 2x 0.75 mm².
- Degree of protection IEC/EN: IP54; NEMA/UL: NEMA 2.
- Mechanical position indicator, manual operation using a crank with locking switch, and adjustable rotation angle with mechanical stops.
Direct mounting on the ball valve is carried out using one screw; the mounting position relative to the valve can be selected in 90° increments.
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Brand
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ReferenceSRF24A-O
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EAN137630498115080
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AC/DC voltageAC/DC 24 V
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Power consumption (running)5.5 W
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Power consumption (holding)1.5 W
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Rated power7.5 VA
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Power supply control connectionCable 1 m, 2x 0.75 mm²
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Control typeClose/Open
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Protection ratingIP54
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NEMA protection ratingNEMA 2
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Enclosure typeUL Enclosure Type 2
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