SFA-S2 - Belimo Spring-return Damper Actuator 20 Nm, < 75 s, 95°

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

The force applied by the Torque of the SFA-S2 is 20 Nm.

The power supply requested for this Rotary Actuator is AC 24...240 V/DC 24...125 V.

If you have questions concerning size or installation, refer to the Belimo custom datasheet above or email iacs for individualised support.

The Belimo SFA-S2 is a Spring-return actuator with a torque of 20 Nm, < 75 s, 95°.

Adjusting air dampers in ventilation and air conditioning systems in buildings with a spring return actuator with an emergency function.

Features

Mode of operation The actuator has a universal power module that can process supply voltages ranging from AC 24 to 240 V as well as DC 24 to 125 V. At the same time as tensioning the return spring, the actuator pushes the damper to the operating position. If the supply voltage is disconnected, the damper is returned to the emergency position by spring force.

Simple direct mounting Simple direct attachment on the damper spindle using a universal spindle clamp, which includes an anti-rotation strap to keep the actuator from turning.

Manual override The hand crank is used to manually operate the damper, which may be locked in any position using the interlocking switch. By supplying the operational voltage, the lock can be unlocked manually or automatically.

Adjustable angle of rotation With a mechanical end stop, the angle of rotation can be adjusted.

High operational reliability The actuator is overload-proof, doesn't require limit switches, and stops when the end stop is reached automatically.

Flexible signalization One auxiliary switch has a fixed position and one auxiliary switch can be adjusted on the actuator. They let you signal a ten percent or ten... ninety percent angle of rotation.

•     Electrical data Nominal voltage AC 24 ... 240 V, 50/60 Hz / DC 24 ... 125 V
•     Nominal voltage range AC 19,2 ... 264 V / DC 21,6 ... 137,5 V
•     Power consumption In operation 7 W @ nominal torque At rest 3.5 W For wire sizing 18 VA
•     Auxiliary switch 2 x SPDT, 1 mA ... 3 (0.5) A, AC 250 V (1 x fix 10% / 1 x adjustable 10 ... 90%)
•     Connection Motor Cable 1 m, 2 x 0.75 mm2 Auxiliary switch Cable 1 m, 6 x 0.75 mm2
•     Functional data Torque Motor Min. 20 Nm @ nominal voltage Spring return Min. 20 Nm 
•     Direction of rotation Can be selected by mounting L / R
•     Manual override With hand crank and interlocking switch
•     Angle of rotation Max. 95°<), can be limited with adjustable mechanical end stop
•     Running time Motor ≤150 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)
•     Service life Min. 60,000 emergency positions
•     Position indication Mechanica
•     Safety Protection class II Totally insulated 
•     Protection mode IP54 NEMA2, UL Enclosure Type 2
•     EMC CE according to 2004/108/EC Low-voltage directive CE according to 2006/95/EC
•     Certification Certified to IEC/EN 60730-1 and IEC/EN 60730-2-14cULus according to UL 60730-1 and UL 60730-2-14and CAN/CSA E60730-1:02
•     Mode of operation Type 1.AA.B 
•     Rated impulse voltage Actuator 4kV Auxiliary switch 2.5 kV
•     Control pollution degree 3
•     Ambient temperature –30 ... +50°C
•     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. 2.4 kg