EFB24-S N4 | Damper Actuator | 270 in-lb | Spg Rtn | 24V | On/Off | SW | NEMA 4 | Belimo (OBSOLETE)
Brand: BelimoSKU: EFB24-S N4
Availability: DISCONTINUED

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EFB24-S N4 | Damper Actuator | 270 in-lb | Spg Rtn | 24V | On/Off | SW | NEMA 4 | Belimo (OBSOLETE)

Belimo | EFB24-S N4
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Details for EFB24-S N4


Damper Actuator | 270 in-lb | Spg Rtn | 24V | On/Off | SW | NEMA 4


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..24-S N4 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..24-S N4 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..24-S N4 versions are provided with two built-in auxiliary switches. These SPDT switches are provided for 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 fixed at 85°. The EF..24-S N4 actuator is shipped at 5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.


Item Number EFB24-S N4
Brand Belimo
Actuator Type Damper
Control Input On/Off
End Switch Yes
Housing NEMA 4
Spring Return Spring Return
Torque 270 in-lb
Voltage 24V


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