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

Belimo BFA24-SR-T

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

Key technical data

• Motor torque: 20 Nm; safety function torque: 20 Nm.
• Rated voltage: AC/DC 24 V (SELV), 50/60 Hz.
• Modulating control: Y signal range 2...10 V; position feedback signal U 2...10 V.
• Motor running time: <60 s / 90°; safety function running time: 20 s @ -10...55°C, <60 s @ -30...-10°C.
• Power consumption during operation: 7 W; in standby position: 1.5 W; wire sizing power: 9.5 VA.
• BAT release: thermal fuses triggered at 72°C outside and inside the duct.
• Auxiliary switches: 2x SPDT, switching points 5° / 80°.
• Mechanical connection: 12x12 mm form-fit connection, hollow through-shaft; maximum rotation angle: 95°.
• Power and control connection: 1 m cable, 4x 0.75 mm², FRNC (halogen-free); auxiliary switch connection: 1 m cable, 6x 0.75 mm², FRNC (halogen-free).
• Motor direction selected by L/R mounting; manual adjustment with stop when the power supply is switched off.
• Degree of protection: IP54; IEC/EN protection class: II, reinforced insulation.

Included: manual crank, position indicator and protective bag. According to the documentation, the actuator is mounted on the damper by the damper manufacturer and supplied directly to safety damper manufacturers.