Belimo BF24-TN/500 - spring-return actuator for fire dampers

Belimo BF24-TN/500

Spring-return actuator for 90° fire and smoke dampers, equipped with a BAT thermal release (72°C). If the power supply is interrupted, the spring moves the damper to the safety position.

Key technical data

• Supply: AC/DC 24 V, 50/60 Hz; Close/Open control.
• 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: 7 W while running and 2 W in the idle position; wire sizing power: 10 VA.
• Auxiliary switches: 2x SPDT, switching points 5° / 80°.
• Mechanical connection: form-fit connection 12x12 mm, non-through hollow shaft.
• Motor direction of movement selected by L/R mounting; manual override with position stop.
• Degree of protection: IP54; IEC/EN protection class III, Safety Extra-Low Voltage (SELV).
• Power/control cable: 5 m, 2x 0.75 mm² (halogen-free); auxiliary switch cable: 5 m, 6x 0.75 mm² (halogen-free).

Included: manual crank, position indicator, protective cover and 12/10 mm form-fit connection insert. According to the documentation, the actuator is adapted and mounted on the damper by the damper manufacturer and supplied directly to manufacturers of safety dampers.