EFB120-S | Damper Actuator | 270 in-lb | Spg Rtn | 100 to 240V | On/Off | Belimo
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Brand: BelimoSKU: EFB120-S

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EFB120-S | Damper Actuator | 270 in-lb | Spg Rtn | 100 to 240V | On/Off | Belimo

Damper Actuator, 270 in-lb [30 Nm], Spring return, AC 100...240 V / DC 100...125 V, On/Off, 2 x SPDT

Belimo | EFB120-S
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Belimo EFB120-S Documents


Details for EFB120-S

Damper Actuator | 270 in-lb | Spg Rtn | 100 to 240V | On/Off

Damper Actuator | 270 in-lb | Spg Rtn | 100 to 240V | On/Off


For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. Control is On/Off from an auxiliary contact or a manual switch. The actuator is mounted directly to a damper shaft up to 1.05” in diameter by means of its universal clamp. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. Maximum of two EF’s can be piggybacked for torque loads of up to 540 in-lbs. Minimum 3/4” diameter shaft and parallel wiring.


The EF..120-S series actuators provide true spring return operation for reliable failsafe application and positive close off on air tight dampers. The spring return system provides constant torque to the damper with, and without, power applied to the actuator. The EF..120-S series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. The EF..120-S versions are provided with two built-in auxiliary switches. These SPDT switches provide safety interfacing or signaling, for example, for fan start-up. The switching function at the fail-safe position is fixed at 10°, the other switch function is adjustable between 10° to +85°. The EF..120-S actuator is shipped at 5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.

Installation Note: Use flexible metal conduit. Push the UL listed conduit fitting device over the actuator’s cable to butt against the enclosure. Screw in conduit connector. Jacket the actuator’s input wiring with UL listed flexible conduit. Properly terminate the conduit in a suitable junction box.


Actuator Type
Spring return
Angle of Rotation
Auxiliary Switches
2 x SPDT
Control Type
Degree of Protection
IP54 NEMA 2 UL Enclosure Type 2
Direction of Rotation (Fail-Safe)
Reversible with cw/ccw mounting
Electrical Connection
Manual Override
5 mm hex crank (3/16" Allen) supplied
Power Consumption (Holding)
4.5 W
Power Consumption (Running)
9 W
Running Time (Fail-safe)
<20 s
Running Time (Motor)
75 s / 90B0
Safety Function
270 in-lb [30 Nm]
Voltage AC/DC
AC 100...240 V


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