Belimo BF24-TN-2-ST actuator
Spring-return actuator for 90° fire and smoke dampers in ventilation and air-conditioning systems. The BAT thermoelectric release has thermal fuses that respond to a temperature of 72°C inside and outside the duct. When the power supply is interrupted, the spring moves the damper to its safety position.
Key technical data
- Nominal voltage: AC/DC 24 V; nominal voltage frequency: 50/60 Hz.
- Control: Close/Open; motor torque: 18 Nm; safety function torque: 12 Nm.
- Motor running time: <120 s / 90°; safety function running time: 16 s @ 20°C.
- Power consumption during operation: 7 W; in rest position: 2 W; for cable sizing: 10 VA.
- Auxiliary switches: 2x SPDT, switching points 5° / 80°.
- Mechanical connection: 12x12 mm form-fit connection, through hollow shaft.
- Power and control connection: cable with 1 m connection plug, 2x 0.75 mm², FRNC (halogen-free); auxiliary switch connection: cable with 1 m connection plug, 6x 0.75 mm², FRNC (halogen-free).
- Motor direction of movement selected by L/R mounting; manual repositioning with stop; mechanical position indicator.
- Degree of protection: IP54; IEC/EN protection class III, Safety Extra-Low Voltage (SELV).
Included: manual 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.
