Belimo BF24-SR-TN - spring-return actuator for fire dampers

Belimo BF24-SR-TN – actuator for fire and smoke dampers

Actuator with return spring and BAT thermoelectric release (72°C), designed for 90° fire and smoke dampers in ventilation and air-conditioning systems. The analogue Y signal controls the damper operating position while tensioning the spring. If the power supply is interrupted, the spring moves the damper to the safety position.

Main technical data

• Power supply: AC/DC 24 V, 50/60 Hz; voltage range AC 19.2...28.8 V / DC 21.6...28.8 V.
• Modulating control: Y signal range 2...10 V; position feedback signal U 2...10 V.
• 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 the rest position: 2 W; sizing power for cables: 9.5 VA.
• Auxiliary switches: 2x SPDT, switching points 5° / 80°.
• 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.
• Mechanical connection: 12x12 mm form-fit connection, non-through hollow shaft; maximum rotation angle 95°.
• Manual override with position stop; motor direction selected by L/R mounting; mechanical position indicator.
• Protection rating IP54; IEC/EN protection class III, Safety Extra-Low Voltage (SELV).

The BAT release responds to a temperature of 72°C outside or inside the duct. The set includes a hand crank, indicator, protective bag and 12/10 mm form-fit insert.