Belimo BF24TL-TN-ST-2 - spring-return actuator for fire dampers

Belimo BF24TL-TN-ST-2 actuator

Spring-return actuator with BAT thermoelectric release (72°C), designed for 90° fire and smoke dampers in ventilation and air-conditioning systems. If the power supply is interrupted or the thermal fuse is triggered, the spring moves the damper to the safety position.

Key features

• Motor torque: 18 Nm; safety function torque: 12 Nm.
• Supply: AC/DC 24 V; frequency: 50/60 Hz.
• Close/Open control with a communication interface; integration into LONWORKS® or BELIMO MP-Bus networks via a communication and power supply unit.
• Motor running time: <120 s / 90°; safety function running time: 16 s @ 20°C.
• BAT release: activation temperature 72°C inside and outside the duct.
• Power consumption: 8 W during operation, 3.5 W in the resting position; 11 VA for cable sizing.
• Auxiliary switches: 2x SPDT; degree of protection: IP54.
• Mechanical connection: 12x12 mm form-fit connection, through hollow shaft.
• Power and control connection: 1 m cable with connector, 4x 0.75 mm², halogen-free; 4-pin connector compatible with BKN230-24LON and BKN230-24MP.
• Motor direction selected by L/R mounting; manual override with position stop; mechanical position indicator.

Supplied with: hand crank, indicator, protective cover and 12/10 mm form-fit insert.