Whether the main switch of 40 units tripped or the switch of one wind cabinet tripped. If it is the main switch, change the main switch to a larger one, or install an extra main switch, one for 20 units. If it still trips, you should check whether the line and the fan are short-circuited. If the circuit breaker inside the wind cabinet trips, then check whether the fan and the line are short-circuited! There is also the rated current of the circuit breaker. If the thermal protection installed has tripped, check the power supply and whether the circuit is loose, whether the load of the fan itself is too large, and whether the rated current of the thermal protection is appropriate. The most important thing is whether the rated current of your switch meets the requirements! It is recommended not to short-circuit the switch. The switch plays a protective role! Short circuiting can easily burn the motor and cause safety accidents!
Depends on actual installation and usage needs.
When selecting a wind cabinet or duct air supply unit, the first thing to determine is the air supply distance, actual use requirements and other key parameters, and then through appropriate conversion, the specifications of the unit to be selected can be obtained. Call the static pressure value.
If you can’t do it yourself, you should find professionals in the industry to confirm and calculate clearly to avoid improper selection that will cause abnormal use later.