Product Description
The BELIMO NFB24-SR-X1 is a direct coupled actuator with a spring return, designed for modulating control with 24 VAC/DC power. It accepts a 2 to 10 VDC or 4 to 20 mA control signal. This actuator provides reliable fail-safe operation and positive close-off on airtight dampers. It delivers constant torque to the damper, whether power is applied or not.
- Provides true spring return operation for reliable failsafe application
- Provides constant torque to the damper with, and without, power applied to the actuator
- May be stalled anywhere in its normal rotation without the need of mechanical end switches
Product Highlights
The NFB24-SR-X1 actuator is ideal for valve and damper applications, offering modulating control and fail-safe functionality.
Product Information
Standard Information
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Brand: BELIMO
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Manufacturer Part Number: NFB24-SR-X1
Technical Specifications
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Housing: NEMA 2, IP54, UL Enclosure Type 2
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Power Consumption: 3.5 W Running, 2.5 W Holding
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Operating Conditions: -22 F To 122 F (-30 C To 50 C)
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Electrical Connection: 18 GA appliance cable, 3 ft [1 m], with 1/2" conduit connector
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Angle of Rotation: 95
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Actuator Type: Spring return
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Control Type: DC 2...10 V
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Degree of Protection: IP54, NEMA 2, UL Enclosure Type 2
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Manual Override: 5 mm hex crank (3/16" Allen), supplied
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Running Time (Fail-safe): <20 s
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Running Time (Motor): 95 s / 90B0
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Voltage AC/DC: AC/DC 24 V
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Torque: 90 in-lb
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Runtime: 95 Secs
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Version: Basic
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Voltage: 24vdc
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Aux. Switch: None
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Spring Return: Spring Return
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Communications: None
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Maintenance: maintenance free
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Torque motor: 90 in-lb [10 Nm]
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Power consumption in operation: 3.5 W
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Power consumption in rest position: 2.5 W
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Transformer sizing: 6 VA (class 2 power source)
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Ambient humidity: 5...95% r.H. non condensing (EN 60730-1)
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Housing material: zinc coated metal and plastic casing
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Position indication: visual indicator, 0 to 95 (0 is full spring return position)
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Ambient Temperature: -22...122 F [-30...50 C]
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Non-operating temperature: -40...176 F [-40...80 C]
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Control: Modulating
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direction of rotation motor: reversible with built-in switch
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direction of rotation spring-return: reversible with cw/ccw mounting
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Overload Protection: electronic throughout 0 to 95 rotation
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Quality Standard: ISO 9001
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Nominal voltage: AC/DC 24 V
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Power Supply: 24 VAC, 20%, 50/60 Hz, 24 VDC, -10% / +20%
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Agency Listing: cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC and 2006/95/EC
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Position Feedback: DC 2...10 V, Max. 0.5 mA
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Operating Range: DC 2...10 V, 4...20 mA w/ ZG-R01 (500 , 1/4 W resistor)
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Emergency control function: Spring Return
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Family Series: NF Series
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Operating range Y: DC 2...10 V
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Control operating range Y note: 4...20 mA w/ ZG-R01 (500 , 1/4 W resistor)
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Position feedback U: DC 2...10 V
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Position feedback U note: Max. 0.5 mA
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Noise Level (Fail-Safe): <62 dB (A)
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Running time (Fail-Safe): <20 seconds
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Noise level, motor: <50 dB (A)
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Fail-Safe function: Spring return
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Connection: cable
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Degree of protection IEC/EN: IP54
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Degree of protection NEMA/UL: NEMA 2
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Enclosure: UL Enclosure Type 2
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Power Consumption For Wire Sizing: 6 VA
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Direction Of Motion Motor: selectable with switch 0/1
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Direction of Rotation (Fail-Safe): Reversible with cw/ccw mounting
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Protection category: IP42
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Degree Of Protection NEMA: NEMA 2
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Enclosure Type: UL Enclosure Type 2
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Control Signal: 2-10VDC
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Auxillary Switch: None
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NEMA 4X Enclosure: No
