Sizing for Motor Loads Softstarter and Protective Device
Sizing for Motor Loads Softstarter and Protective Device
(OP)
Please help me on how to size / calculate for the required rating of the softstarter and protective device for a certain motor load. Thank you in advance.





RE: Sizing for Motor Loads Softstarter and Protective Device
RE: Sizing for Motor Loads Softstarter and Protective Device
i.e:
motor specs / Source:
700 HP, V = 4160, 3 phase, 60 Hz
RE: Sizing for Motor Loads Softstarter and Protective Device
RE: Sizing for Motor Loads Softstarter and Protective Device
Assuming someone has properly sized the motor, you size the soft starter for the motor you will connect to it. I don't see the issue here. 700HP motor, 700HP starter.
Protective device? Do you mean the fuses or circuit breaker? Generally you will not have much of a choice, when you buy the soft starter, the devices inside will have been coordinated with specific fuses and you usually cannot deviate from those without violating the starter design. this is a discussion you need to have with the soft starter mfrs.
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