Belimo BF24-ST - spring-return actuator for fire and smoke control dampers

Belimo BF24-ST – actuator for fire and smoke control dampers

The actuator moves the damper to its operating position while tensioning the return spring. If the power supply is interrupted, the spring's stored energy moves the damper to its safety position. The manufacturer states that the actuator is mounted on the damper by its manufacturer and supplied directly to manufacturers of safety dampers.

Key features and technical data

• Rated voltage: AC/DC 24 V; rated voltage frequency: 50/60 Hz.
• Control: Open/Close; motor torque: 18 Nm; safety function torque: 12 Nm.
• Motor running time: <120 s / 90°; safety function running time: 16 s @ 20°C.
• Power consumption during operation: 7 W; at rest: 2 W; sizing power: 10 VA.
• Auxiliary switches: 2x SPDT; switching points: 5° / 80°.
• Mechanical connection: 12x12 mm form-fit connection, non-through hollow shaft; maximum rotation angle: 95°.
• Motor direction selected by L/R mounting; manual override with position stop.
• Power and control connection: 1 m cable with connection plug, 2x 0.75 mm², FRNC (halogen-free); auxiliary switch connection: 1 m cable with connection plug, 6x 0.75 mm², FRNC (halogen-free).
• Mechanical position indicator; IP54 protection rating; IEC/EN III protection class, Safety Extra-Low Voltage (SELV).

Included: hand crank, indicator, protective cover and insert for 12/10 mm form-fit connection.