SRF24A-S2 - Belimo Spring-return actuator NC 20 Nm, < 75 s, 90° | ideal for ball valves and butterfly valves

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The Belimo SRF24A-S2 is a kind of Actuator used in HVAC applications and air ventilation systems.

The Torque used by the SRF24A-S2 is 20 Nm.

The power supply requested for this Rotary Actuator is 24Vac/Vdc.

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If you have questions about size or installation, consult the Belimo custom datasheet above or send an email to iacs to get personalised guidance.

SRF24A-S2 - Spring-return actuator NC

•    20 Nm, < 75 s, 90°
•    AC / DC 24 V Open/Close, 2 x SPDT
•    IP 54, Manual override with integrated position stop
•    Running time spring < 20 s
•    Connection PVC cable 1m
•    Auxiliary switch 2 integral
•    Safety control closedYES
•    with mounted kit RKH mounted

Features
 

• Mode of operation The actuator moves the butterfly valve to the operating position at the same time as tensioning the return spring. The butterfly valve is turned back to the safety position by spring force if the supply voltage is interrupted.
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• Simple direct mounting Straightforward direct mounting on the butterfly valve with only one screw. The mounting position in relation to the butterfly valve can be selected in 90°<) steps.


• Manual override Manual operation of the valve with the hand crank, locking in any position with the interlocking switch. Unlocking is manual or automatic by applying the operating voltage.
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• Adjustable angle of rotation Adjustable angle of rotation with mechanical end stop.
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• High operational reliability The actuator is overload-proof, requires no limit switches and automatically stops when the end stop is reached.


• Flexible signalization  The actuator has one auxiliary switch with a fixed setting and one adjustable auxiliary switch. They permit a 10% or 11 ... 100% angle of rotation to be signalled.
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• Combination valve actuators Refer to the valve documentation for suitable valves, their permitted media temperatures and closing pressures.
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•    Electrical data Nominal voltage AC 24 V, 50/60 Hz / DC 24 V
•    Nominal voltage range AC 19.2 ... 28.8 V / DC 21.6 ... 28.8 V
•    Power consumption In operation 4.5 W @ nominal torque
•    At rest 2.5 W
•    For wire sizing 6.5 VA
•    Auxiliary switch 2 x SPDT, 1 mA ... 3 (0.5) A, AC 250 V (1 x fix 10% / 1 x adjustable 11 ... 100%)
•    Connection Motor Cable 1 m, 2 x 0.75 mm2
•    Auxiliary switch Cable 1 m, 6 x 0.75 mm2
•    Parallel connection Yes (Note performance data for supply!)
•    Functional data Torque Motor Min. 20 Nm @ nominal voltage
•    Spring return Min. 20 Nm
•    Direction of rotation Spring return
•    – SRF24A-S2-5
•    – SRF24A-S2-5-O
•    Deenergised NC, butterfly valve closed (A – AB = 0%)
•    Deenergised NO, butterfly valve open (A – AB = 100%)
•    Manual override With hand crank and interlocking switch
•    Angle of rotation Max. 90°
•    Running time Motor ≤75 s / 90°
•    Spring return ≤20 s @ –20 ... 50°C / max. 60 s @ –30°C
•    Sound power level Motor ≤45 dB (A)
•    Spring return ≤62 dB (A)
•    Position indication Mechanical
•    Safety Protection class III Extra low voltage / UL Class 2 Supply
•    Degree of protection IP54 NEMA 2, UL Enclosure Type 2
•    EMC CE according to 2004/108/EC
•    Low-voltage directive CE according to 2006/95/EC
•    Certification cULus according to UL 60730-1A and UL 60730-2-14 and CAN/CSA E60730-1:02 Certified to IEC/EN 60730-1 and IEC/EN 60730-2-14
•    Mode of operation Type 1.AA.B
•    Rated impulse voltage Actuator 0.8 kV
•    Auxiliary switch 2.5 kV
•    Control pollution degree 3
•    Ambient temperature –30 ... +50°C
•    Media temperature +5 ... +100°C (in butterfly valve)
•    Non-operating temperature –40 ... +80°C
•    Ambient humidity 95% r.h., non-condensating
•    Maintenance Maintenance-free
•    Dimensions / Weight Dimensions See «Dimensions» on page 3
•    Weight Approx. 2.2 kg (without butterfly valve)