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

Belimo BFN24-T-ST/500

Actuator with return spring and BAT thermal release (72°C) for 90° fire and smoke dampers in ventilation and air-conditioning systems. If the power supply is interrupted, the spring moves the damper to the safety position. The BAT release interrupts the power supply when one of the thermal fuses trips.

Key features and specifications

• Supply: AC/DC 24 V, 50/60 Hz; Close/Open control.
• 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.
• BAT thermal release: fuse trip temperature for duct interior and exterior 72°C.
• Auxiliary switches: 2x SPDT, switching points 5° / 80°.
• Mechanical connection: form-fit connection 12x12 mm, through hollow shaft; max. rotation angle 95°.
• Power and auxiliary switch connections: cables with 5 m connection plugs, FRNC (halogen-free).
• Power consumption: 3.2 W during movement and 1.2 W in the rest position; 4.3 VA for cable sizing.
• Manual adjustment with stop; motor direction selected by L/R mounting.
• IEC/EN protection rating: IP54. Supplied with: hand crank, position indicator and protective bag.

The actuator is adapted and mounted on the damper by the damper manufacturer; according to Belimo documentation, it is supplied directly to manufacturers of safety dampers.