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Sizing Fuses And Circuit Breaker For A Pump


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I need general direction or advise on how to size a CB and a fuse in series for a pump.


The pump (4kW, 7A) is driven by a VSD which is fed from a 3phase 415V ~50Hz 50KA 1 Sec board. The VSD is fed by a Circuit breaker and fuse in series.


The order is as follows: feeder board, CB, Fuse, VSD, Pump.


I really appreciate anyone who can give me feedback how to arrive to the rating of the CB and Fuse. The pump is located on a farm and is situated about 200m from the switchboard room.


Thanks and Regards


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