SRF24A-R Spring-return actuator NC, 20 Nm, AC/DC 24 V, 20 s - Belimo | ideal for ball valves and butterfly valves

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

The force applied by the Torque of the SRF24A-R is 20 Nm.

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

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Consult the Belimo custom datasheet above or contact iacs via email for personalised assistance if you have queries about size or installation.

SRF24A-R Spring-return actuator NC, 20 Nm, AC/DC 24 V, 20 s

• Spring-return actuator NC
• 20 Nm, < 75 s, 
• AC/DC 24 V, Open/Close
• IP 54, Manual override with integrated position stop
• Running time spring < 20 s
• Connection PVC cable 1m
• with mounted retrofit kit

Mode of operation: The actuator moves the valve to the operating position at the same time as tensioning the return spring. The valve is turned back to the emergency position by spring force when the supply voltage is interrupted.

Application: For rotary valves and butterfly valves with the following mechanical specifications: – ISO 5211: F03, F04, F05 (hole circle diameter on the flange for mounting the fitting) – ISO 5211: quadratic, flat head or wedge-shaped stem head geometry. 

Direct mounting: Simple direct mounting on the rotary valve or butterfly valve with mounting flange. The mounting orientation in relation to the fitting can be selected in 90° steps.

Manual override: Manual actuation of the valve with manual elevator crank, engagement with the locking switch at any position. Unlocking is manual or automatic by applying the operating voltage.

High functional reliability: The actuator is overload protected, requires no limit switches and automatically stops when the end stop is reached.

Adjustable angle of rotation: Adjustable angle of rotation with mechanical end stop

Electrical data:

• Nominal voltage AC/DC 24 V
• Nominal voltage frequency 50/60 Hz
• Nominal voltage range AC 19.2...28.8 V / DC 21.6...28.8 V
• Power consumption in operation 5 W
• Power consumption in rest position 2.5 W
• Power consumption for wire sizing 7.5 VA
• Connection supply / control Cable 1 m, 2 x 0.75 mm²
• Parallel operation Yes (note the performance data)

Functional data:

• Torque motor Min. 20 Nm
• Torque spring return Min. 20 Nm
• Direction of rotation spring-return selectable:Deenergised NC, valve closed (A - AB = 0%), Deenergised NO, valve open (A - AB = 100%)
• Manual override By means of hand crank and locking switch
• Angle of rotation 90°
• Running time motor 75 s / 90°
• Running time emergency setting position < 20 s / 90°
• Sound power level motor max. 45 dB(A)
• Position indication Mechanical
• Service life Min. 60,000 emergency positions

Safety:

• Protection class IEC/EN III Safety extra-low voltage
• Protection class UL UL Class 2 Supply
• Degree of protection IEC/EN IP54
• Degree of protection NEMA/UL NEMA 2, UL Enclosure Type 2
• EMC CE according to 2004/108/EC
• Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14
• Certification UL cULus according to UL 60730-1A, UL 60730-2-14 and CAN/CSA E60730-1:02
• Mode of operation Type 1.AA
• Rated impulse voltage supply / control 0.8 kV
• Control pollution degree 3
• Ambient temperature 0...50°C
• Non-operating temperature -40...80°C
• Ambient humidity 95% r.h., non-condensing
• Maintenance Maintenance-free

Mechanical data: 

Connection flange F03/F04/F05

Weight: Approx. 2.3 kg