Belimo BFA24-ST - spring-return actuator for fire and smoke dampers

Belimo BFA24-ST – actuator for fire and smoke dampers

The actuator moves the damper to its operating position while tensioning the return spring. When the power supply is interrupted, the spring’s stored energy moves the damper to its safety position.

Key technical data

• Motor torque: 20 Nm; safety function torque: 20 Nm.
• Rated voltage: AC/DC 24 V (SELV); frequency: 50/60 Hz.
• Control: Close/Open; motor direction of rotation selected by L/R mounting.
• Motor running time: <60 s / 90°; safety function running time: 20 s @ -10...55°C, <60 s @ -30...-10°C.
• Auxiliary switches: 2x SPDT; switching points: 5° / 80°.
• Power consumption during operation: 7.5 W; in rest position: 1.5 W; sizing power: 10 VA.
• Mechanical connection: 12x12 mm form-fit connection, hollow through shaft; rotation angle: max. 95°.
• Power and control connection: 1 m cable with connector, 2x 0.75 mm², FRNC (halogen-free); auxiliary switch connection: 1 m cable with connector, 6x 0.75 mm², FRNC (halogen-free).
• Manual override with position stop; mechanical position indicator.
• Degree of protection: IP54; IEC/EN protection class: II, reinforced insulation.

Included: hand crank, indicator and protective cover.