SRF24A-SZ-S2-5 - Belimo Spring-return actuator NC 20 Nm, 90 s, 90° | ideal for ball valves and butterfly valves

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The Belimo SRF24A-SZ-S2-5 is a type of Actuator used in HVAC and ventilation systems.

The force applied by the Torque of the SRF24A-SZ-S2-5 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-SZ-S2-5 - Spring-return actuator NC

•    20 Nm, < 90 s, 90°
•    AC / DC 24 V, modulating 2 x SPDT
•    IP 54, Manual override with integrated position stop
•    Running time spring < 20 s
•    Control DC 0...10 V
•    Operating range DC 0.5...10 V
•    Position feedback DC 0.5...10 V
•    Connection PVC cable 1m
•    Auxiliary switch 2 integral
•    Emergency control openYES
•    with mounted kit BFV 

Features
 

• Mode of operation The actuator is controlled with a standard signal of DC 0 ... 10 V and 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 emergency position by spring force if the supply voltage is interrupted.


• 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.


• Adjustable angle of rotation Adjustable angle of rotation with mechanical end stop.


• 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.


• Combination valve actuators  Refer to the valve documentation for suitable valves, their permitted media temperatures and closing pressures.

•    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 5.5 W @ nominal torque At rest 3 W For wire sizing 8.5 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, 4 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
•    Control Control signal Y  DC 0 … 10 V, input impedance 100 k� Operating range DC 0.5 ... 10 V
•    Position feedback (measuring voltage U) DC 0.5 ... 10 V, max. 0.5 mA
•    Position accuracy ±5% 
•    Direction of rotation Motor Reversible with switch Spring return – SRF24A-SZ-5  Deenergised NC, butterfly valve closed (A – AB = 0%) – SRF24A-SZ-5-O Deenergised NO, butterfly valve open (A – AB = 100%)
•    Manual override With hand crank and interlocking switch
•    Angle of rotation Max. 90°<)  
•    Running time Motor ≤90 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)