Belimo BFA24-T-ST - spring-return actuator for fire dampers

Belimo BFA24-T-ST actuator

The spring-return actuator with BAT thermal release (72°C) is designed for 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. If the power supply is interrupted, the spring energy moves the damper to the safety position.

Key features and specifications

• Motor torque: 20 Nm; safety function torque: 20 Nm.
• Rated voltage: AC/DC 24 V (SELV); frequency: 50/60 Hz; control: Close/Open.
• Power consumption during operation: 7.5 W; at rest: 1.5 W; power rating for cable sizing: 10 VA.
• Motor running time: <60 s / 90°; safety function running time: 20 s @ -10...55°C, <60 s @ -30...-10°C.
• BAT release with thermal fuses responding to a temperature of 72°C inside and outside the duct.
• Two auxiliary switches, 2x SPDT, switching points 5° / 80°.
• 12x12 mm form-fit connection, continuous hollow shaft; maximum rotation angle: 95°.
• Motor direction selected by L/R mounting; manual adjustment with stop when the power supply is switched off.
• 1 m cables with connection plugs: power supply/control 2x 0.75 mm² and auxiliary switch 6x 0.75 mm²; FRNC (halogen-free).
• Degree of protection IP54; IEC/EN protection class II, reinforced insulation.

Included: hand crank, position indicator and protective bag.