Regarding the power capacity required by the compressor and the rated current of the air switch (there are bonus points for this!)
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This post was last edited by Graham on 2017-7-13 at 10:24. Everyone, I need to provide customers with compressors driven by 380V three-phase motors of 7.5kW, with a rated current of around 14A. In this case, can the motor be started directly? How many watts of power supply capacity is required from the customer? How many amps should the protection switch be set to? I’m not an electrical engineering major, so please help out a lot – there will be rewards! Thank you!
Which guy can help reply?
This post was last edited by Electric Apprentice on 2017-7-14 at 10:01. 1. It can be started directly. 2. For such a small motor, there’s no need to consider the power supply capacity provided by the customer; a power cable of 5*4mm2 is sufficient. 3. A 16A circuit breaker is recommended
Start it directly; there’s no need to worry about the power supply capacity for a 7.5KW motor. Use 4*4MM2 cables and a 16A circuit breaker
It can be started directly; consider a 20A circuit breaker
Whether to start it directly depends on the transformer capacity.
1. It can be started directly. 2. A 25A circuit breaker should be used; a 16A one is clearly insufficient, as it may trip during startup. 3. Cables of 4 mm² or 2.5 mm² can be used, depending on the cable length and installation method; if possible, use 5*4 mm² cables