Belimo BF48-5-ST - spring-return actuator for fire dampers

Belimo BF48-5-ST

Spring-return actuator for 90° fire and smoke control dampers in ventilation and air conditioning systems. When powered, it moves the damper to the operating position and tensions the return spring. When the power supply is interrupted, the spring energy moves the damper to the safety position.

Key features

• Motor torque: 18 Nm; safety function torque: 12 Nm.
• Rated voltage: AC/DC 48 V; frequency: 50/60 Hz.
• Control: Close/Open; motor running time: <120 s / 90°; safety function running time: 16 s @ 20°C.
• Auxiliary switches: 2x SPDT, switching points 5° / 80°.
• Mechanical connection: form-fit connection 12x12 mm, non-through hollow shaft.
• Motor direction of movement selected by L/R mounting; manual adjustment with position stop.
• Power consumption during operation: 11 W; at rest: 3.5 W; for cable sizing: 16 VA.
• Power and control connection: cable with 1 m connection plug, 2x 0.75 mm², FRNC (halogen-free). Auxiliary switch connection: cable with 1 m connection plug, 6x 0.75 mm², FRNC (halogen-free).
• Degree of protection: IP54; IEC/EN protection class: III, Safety Extra-Low Voltage (SELV).

Included: manual crank, position indicator, protective bag and 12/10 mm form-fit insert.