Belimo BFN24/500 - spring-return actuator for fire dampers

Belimo BFN24/500 – actuator for fire and smoke dampers

Spring-return actuator for 90° dampers in ventilation and air-conditioning systems. During operation, the motor moves the damper to its operating position and tensions the return spring. If the power supply is interrupted, the spring moves the damper to its safety position.

Key features and specifications

• Supply: AC/DC 24 V; frequency: 50/60 Hz; control: Close/Open.
• Motor torque: 9 Nm; safety function torque: 7 Nm.
• Motor running time: <60 s / 90°; safety function running time: 20 s @ -10...55°C, <60 s @ -30...-10°C.
• Angle of rotation: Max. 95°; motor direction of rotation selected by L/R mounting.
• 12x12 mm form-fit connection, hollow through shaft.
• Auxiliary switches: 2x SPDT, switching points 5° / 80°.
• Power and control connection: 5 m cable, 2x 0.75 mm² (halogen-free); auxiliary switch connection: 5 m cable, 6x 0.75 mm² (halogen-free).
• Degree of protection: IP54; IEC/EN protection class: III, Safety Extra-Low Voltage (SELV).
• Manual adjustment with position stop; mechanical position indicator.
• Included: hand crank, indicator and protective bag.

Note on power consumption: The technical datasheet specifies 4W during operation, 1.4 W at rest and 6 VA for cable sizing. Other values appear in the other supplied product data; confirm the applicable documentation version before selecting the installation.