Belimo BFL24-T - spring-return actuator for fire dampers

Belimo BFL24-T – actuator for fire dampers

This spring-return actuator with a BAT thermoelectric release (72°C) is designed for 90° fire and smoke dampers in ventilation and air-conditioning systems. During operation, the motor moves the damper to the operating position and tensions the spring. An interruption to the power supply causes the damper to return to the safety position.

Key features

• Supply: AC/DC 24 V; rated voltage frequency: 50/60 Hz.
• Control: Close/Open; motor torque: 4 Nm; safety function torque: 3 Nm.
• Motor running time: <60 s / 90°; safety function running time: 20 s @ -10...55°C, <60 s @ -30...-10°C.
• BAT thermoelectric release: thermal fuse activation temperature inside and outside the duct 72°C.
• Auxiliary switches: 2x SPDT; switching points: 5° / 80°.
• Mechanical connection: 12x12 mm form-fit connection, hollow through shaft; motor direction of rotation selected by L/R mounting.
• Manual override with position stop; mechanical position indicator.
• Power consumption during operation: 2 W; in rest position: 0.7 W; power for cable sizing: 2.8 VA.
• IEC/EN degree of protection: IP54; IEC/EN protection class: III, Safety Extra-Low Voltage (SELV).

Power and control connection: 1 m cable, 2x 0.75 mm², FRNC (halogen-free). Auxiliary switch connection: 1 m cable, 6x 0.75 mm², FRNC (halogen-free). Supplied with: hand crank, indicator, protective cover and 12/10 mm form-fit insert.