Which circuit breaker, starter and thermal relay should I choose for an 11 kW engine?

Which automatic machine, magnetic starter and thermal relay for an 11kW induction motor?

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Posted: Updated: 06.05.2018 1 comment
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  • Admin
    05/06/2018 at 15:11

    Look at the passport data of the electric motor - the current should be indicated there when connecting the windings to a star and a triangle. If this data is not available, then you need to determine the rated motor current according to the formula Inom = P / (1.73 · U · cosφ · η), where P is the motor power - in your case 11 kW, U - voltage 380 V (if the windings are connected to a star) or 220 V (if the windings are connected to a tributary), cosφ and η are indicated in the motor data sheet. Based on the current received, select the closest larger rating of the machine and the magnetic starter. Machine class (frequency of operation of the electromagnetic release), select C (if a normal start) or D (if a heavy start). How to choose a thermal relay according to the calculated current value, read the article https://my.electricianexp.com/en/instrukciya-po-vyboru-teplovogo-rele-dlya-zashhity-elektrodvigatelya.html

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