The supply fan and make-up fan control box is a specialized electrical unit designed to provide start/stop control, operational protection, and status monitoring for supply fans (used to deliver fresh air indoors) and make-up fans (used to replenish air for smoke exhaust systems or maintain pressure balance in local areas).
It is widely applied in building ventilation systems, fire smoke exhaust systems, and industrial workshop ventilation.

Internal Configuration:
The control box is equipped with:

Circuit breakers – for overload and short-circuit protection

Contactors – for motor switching and control

Thermal overload relays – to protect motors from prolonged overcurrent

These components ensure reliable fan operation, safe electrical control, and protection against electrical faults in ventilation-related equipment.

Technical Parameters

Rated Operational Voltage (Ue): AC 380 V / AC 220 V

Rated Frequency (fn): 50 Hz

Rated Current of Main Busbar (InA): 250 A ~ 10 A

Rated Short-Time Withstand Current of Main Busbar (Icw): 4 kA

Enclosure Type: Indoor

Degree of Protection:

IP54 (Operating Face)

IP20C (Other Surfaces)