Belimo BFL24-SR-T - fire damper actuator

Belimo BFL24-SR-T – spring-return actuator for fire and smoke dampers

Actuator with modulating control and BAT thermal release (72°C), designed for 90° fire and smoke dampers in ventilation and air-conditioning systems. During operation, the return spring is tensioned; when the power supply is interrupted, it moves the damper to the safety position.

Key specifications

• Supply: AC/DC 24 V; nominal voltage frequency: 50/60 Hz.
• Modulating control: operating range Y 2...10 V; feedback signal U 2...10 V.
• Torque: motor 4 Nm; safety function 3 Nm.
• Motor running time: <60 s / 90°; safety function running time: 20 s @ -10...55°C, <60 s @ -30...-10°C.
• BAT release: operating temperature of thermal fuses inside and outside the duct 72°C.
• Auxiliary switches: 2x SPDT, switching points 5° / 80°.
• Mechanical connection: 12x12 mm form-fit connection, through hollow shaft; max. rotation angle 95°.
• Power consumption during operation: 2.3 W; in the rest position: 0.6 W; for cable sizing: 4.1 VA.
• Power and control connection: 1 m cable, 4x 0.75 mm², halogen-free; auxiliary switch connection: 1 m cable, 6x 0.75 mm², halogen-free.
• IEC/EN protection rating: IP54; IEC/EN protection class: III, Safety Extra-Low Voltage (SELV).

Operation and equipment

The motor direction of movement can be selected by left/right mounting. The actuator allows manual adjustment with a stop and has a mechanical position indicator. The package includes a hand crank, indicator, protective cover and 12/10 mm form-fit connection insert.