NF24-SR US    | Damper Actuator | 90 in-lb | Spg Rtn | 24V | Modulating  |   Belimo  (OBSOLETE)
Brand: BelimoSKU: NF24-SR US
Availability: DISCONTINUED

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NF24-SR US | Damper Actuator | 90 in-lb | Spg Rtn | 24V | Modulating | Belimo (OBSOLETE)

Belimo | NF24-SR US
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Details for NF24-SR US


Damper Actuator | 90 in-lb | Spg Rtn | 24V | Modulating


For proportional modulation of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications.

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.

The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication or master-slave applications.


The NF series actuators provide true spring return operation for reliable fail-safe 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 NF series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°.

The NF24-SR US uses a brushless DC motor which is controlled by an Application Specific Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides the intelligence to the ASIC to provide a constant rotation rate and to know the actuator’s exact fail-safe position. The ASIC monitors and controls the brushless DC motor’s rotation and provides a digital rotation sensing function to prevent damage to the actuator in a stall condition. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches.


Item Number NF24-SR US
Brand Belimo
Actuator Type Damper
Control Input Modulating
Spring Return Spring Return
Torque 90 in-lb
Voltage 24V


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