Belimo NMCB24-3 Actuator Motor

The Belimo NMCB24-3 is a high-torque non-spring return rotary actuator designed for the precise control of dampers and valves in commercial HVACR systems. Delivering 90 in-lb of torque, this 24V motor actuator supports on/off and floating point control signals, making it a versatile drop-in replacement for diverse air handling applications. Engineered for reliability, the NMCB24-3 features a brushless DC motor controlled by an Application Specific Integrated Circuit (ASIC), which monitors motor rotation and provides electronic overload protection throughout the full 95° stroke. This eliminates the need for limit switches and ensures the drive remains stalled in position without consuming excessive power at end-of-travel. The universal spindle clamp and reversible rotation switch allow for rapid field installation on various shaft diameters. Designed for long-term industrial service life, the unit maintains consistent timing and torque output under varying load conditions, ensuring tight shut-off and accurate positioning in demanding ventilation environments.

• Electronic Overload Protection: Increases service life by automatically stopping the motor at the end of its stroke without mechanical stress.
• 90 in-lb Constant Torque: Provides reliable actuation for medium-sized dampers and ball valves without torque drop-off.
• Dual Signal Compatibility: Operates on either 24Vac or 24Vdc power supplies, supporting both floating point and on/off control strategies.
• Manual Override: Features an external push-button to disengage the gear train for manual positioning during commissioning or maintenance.
• Simple Field Direction: Includes a convenient direction of rotation (reverse/forward) switch to match damper orientation without rewiring.

What is the typical run time for the NMCB24-3?
The Belimo NMCB24-3 features a standard motor run time of 150 seconds for a 95-degree rotation, ensuring smooth dampening without pressure spikes.

Can this actuator be mounted in any orientation?
Yes, the NMCB24-3 can be mounted in any position, though it is recommended to avoid mounting with the conduit facing upwards to prevent moisture ingress.

Is a feedback potentiometer included?
Standard NMCB24-3 models are 3-wire floating control units; if 2-10VDC feedback is required, verify if your specific sub-model includes the auxiliary switch or feedback add-ons.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.