12/20/2023 0 Comments Breaker size 10 hp 3 phase![]() ![]() Also we must to montage electromagnetic trip device for line's and motor's protection from short circuit current. To use double protection for line and motor.Overload protection have to be 1. overload relays or automate sweech breakers used for motor's protection are regulated. Calculate please and You get approximately refered result.For delta-connection motor's current (in windings) would be three times lower. motor ir star-connected(In=P/3xUnxcos phi x eff).I don't know cos and efficiency. Let us calculate.If it is British HP i.e. If the motor is a 230V three-phase type, then you may need 3-30A (three-pole) circuit breaker (if the motor has the soft start) or higher rated up to 3-40A, if you do not find 3-45A. The 2-15A twin circuit breaker would be undersized. It could also be 240V/120V single phase three-wire power supply connected to the 240V/120V 3phase 4wire panel)Īssuming that the motor is 230V single phase, then 2-30A (twin) circuit breaker can be used if the motor has soft start, else 2-40A is maximum if you do not find 2-45A circuit breaker. ![]() 240V/120V three phase, 4-wire (which you probably have since 240V/120V 3phase 4wire panel does not guarantee that you actually have the power supply 240V/120V 3phase 4-wire type. Then, either one or both transformers may have a centertap which will provide 120V from centertap (neutral) to each transformer secondary winding end terminal. 240V delta (open = two transformers, or closed = three transformers) ![]()
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