Belimo NFB24-MFT-S
SKU: CS3175192MPN: NFB24-MFT-S
Damper Actuator, 90 in-lb [10 Nm], Spring return, AC/DC 24 V, 2...10 V, 2 x SPDT, MFT/programmable

$540.37
Unit5+ Units Available at Factory - Ships Same/Next Business Day
Product Details
Belimo’s new NFB and NFX Series sets a new standard for direct-coupled spring return actuators in the HVAC market. A compact size, low power consumption and 50% increase in minimum torque output set the new NFB and NFX apart from other market solutions. More torque combined with faster running times for both motor drive and spring return widen the application fields giving customers a cost effective solution with high quality.
Features:
- 90 in-lbs (10 Nm) min. torque. 50% more than original NF.
- New smaller housing for tight spaces, plus reduced shaft-center to edge distance: 1.25” compared to 1.97” with today’s NF.
- Manual override is now standard on all models. Provides same benefits as today’s AF series; faster installation and easier maintenance of equipment with lock-in-place switch.
- Universal power supply (On/Off models only) can accept 24 up to 240 VAC. One actuator for all power supply voltages, ideal for customers with limited storage space (store rooms, service vehicles, etc)
- 3, 10 and 16 ft cable options just like non-spring return actuator (X models only)
- Built-in mechanical limit stop, a separate accessory no longer needed.
Attributes
| Control | MFT/programmable |
| Auxillary Switch | 2 x SPDT |
| Fail-Safe | Spring Return |
| Torque | 90 in-lb |
| Nominal Voltage | AC/DC 24 V |
| Transformer Sizing | 9 VA (class 2 power source) |
| Enclosure | UL Enclosure Type 2 |
| Power Supply | 24 VAC, ±20%, 50/60 Hz, 24 VDC, -10% / +20% |
| Power Consumption In Operation | 6.5 W |
| Power Consumption In Rest Position | 3 W |
| Electrical Connection | (2) 18 GA appliance cables with ½” conduit connectors, 3 ft [1 m], |
| Overload Protection | electronic throughout 0…95° rotation |
| Operating Range | 2…10 V (default), 4…20 mA w/ ZG-R01 (500 Ω, ¼ W resistor), variable (VDC, PWM, on/off, floating point) |
| Operating Range Y Variable | Start point 0.5…30 V End point 2.5…32 V |
| Input Impedance | 100 kΩ for 2…10 V (0.1 mA), 500 Ω for 4…20 mA, 1500 Ω for PWM, On/Off and Floating point |
| Position Feedback | 2…10 V, Max. 0.5 mA, VDC variable |
| Angle Of Rotation | 95°, adjustable with mechanical end stop, 35…95° |
| Direction Of Motion Motor | selectable with switch 0/1 |
| Position Indication | Mechanical |
| Running Time (Motor) | default 150 s, variable 40…150 s |
| Running Time Fail-Safe | <20 s |
| Ambient Humidity | max. 95% r.H., non-condensing |
| Ambient Temperature | -22…122°F [-30…50°C] |
| Storage Temperature | -40…176°F [-40…80°C] |
| Degree Of Protection Iec/En | IP54 |
| Degree Of Protection Nema/Ul | NEMA 2 |
| Connection | cable |
| Servicing | maintenance-free |
| Housing Material | Galvanized steel and plastic housing |
| Nominal Voltage Dc | 24 V |
| Nominal Voltage Ac | 24 V |
| Noise Level, Motor | 40 dB(A) |
| Torque Motor | 90 in-lb [10 Nm] |
| Electrical Protection | actuators are double insulated |
| Quality Standard | ISO 9001 |
| Noise Level, Fail-Safe | 62 dB(A) |
| Angle Of Rotation Adaptation | off (default) |
| Agency Listing | cULus listed to UL60730-1A:02; UL 60730-2-14:02 and CAN/CSA-E60730-1:02; Listed to UL 2043 - suitable for use in air plenums per Section 300.22© of the NEC and Section 602.2 of the IMC |
| Shaft Diameter | ½…1.05” round, centers on ½” and ¾” with insert, 1.05” without insert |
| Auxiliary Switch | 2 x SPDT, 3 A resistive (0.5 A inductive) @ AC 250 V, one set at 10°, one adjustable 10…90° |
| Override Control | MIN (minimum position) = 0% MID (intermediate position) = 50% MAX (maximum position) = 100% |
| Fail-Safe Function | Spring return |
| Control Type Web | MFT/Programmable |
| Fail-Safe | YES |
Specifications
| SKU | CS3175192 |
|---|---|
| MPN | NFB24-MFT-S |











