Belimo BF24-2-ST - spring-return actuator for fire and smoke dampers

Belimo BF24-2-ST – actuator for fire and smoke dampers

The actuator moves the damper to its operating position by tensioning the return spring. If the power supply is interrupted, the spring's stored energy moves the damper to its safety position. Plug connectors allow connection via communication and power supply units to control and monitoring systems or bus networks.

Key features

• Rated voltage: AC/DC 24 V; frequency: 50/60 Hz.
• Control: Close/Open; motor torque: 18 Nm; safety function torque: 12 Nm.
• Motor running time: <120 s / 90°; safety function running time: 16 s @ 20°C.
• Auxiliary switches: 2x SPDT; switching points: 5° / 80°.
• Power consumption during operation: 7 W; in the rest position: 2 W; for cable sizing: 10 VA.
• Mechanical connection: 12x12 mm form-fit connection, through hollow shaft. Motor direction of movement selected by L/R mounting.
• Manual adjustment with position stop; mechanical position indicator.
• 1 m cables with plug connectors for power supply and control, and auxiliary switches.
• Degree of protection: IP54; IEC/EN protection class: III, Safety Extra-Low Voltage (SELV).

Included: hand crank, position indicator and protective cover. The actuator is adapted and mounted on the damper by the damper manufacturer.