how to select a breaker (MCB,MCCB,ELCB) for 18.5 kw, 3 ph. 480 v, 60 hz inducti

how to select a breaker (MCB,MCCB,ELCB) for 18.5 kw, 3 ph.
480 v, 60 hz induction motor?

Question Posted / jaya

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how to select a breaker (MCB,MCCB,ELCB) for 18.5 kw, 3 ph. 480 v, 60 hz induction motor?..

Answer / engr ali mehmood

MCB are used for small power application; usually used in
the household appliances current rating is 5A.
MCCB are used in high power application in generation
station above 100A;Rarely used but the most common used in
industries is MPCB variable Rating of current adjust
according to the load current of the the appliances. and
the ELCB is a earth leakige circuit breaker it is use for a
body earth ground earth

Is This Answer Correct ?

27 Yes

18 No

how to select a breaker (MCB,MCCB,ELCB) for 18.5 kw, 3 ph. 480 v, 60 hz induction motor?..

Answer / simon peter

Here 18.5w means 480v*38 amp so buy any one of these impere based ......

Is This Answer Correct ?

4 Yes

7 No

how to select a breaker (MCB,MCCB,ELCB) for 18.5 kw, 3 ph. 480 v, 60 hz induction motor?..

Answer / jayaraj

P=Sq rt 3VI pf
So I = 27.8 Amps. considering the staring current twice as full load current = 55A so 63 A MCCB required. Depends on the KA of the system 25KA or 50 KA MCCB can be selected.

Is This Answer Correct ?

13 Yes

17 No

how to select a breaker (MCB,MCCB,ELCB) for 18.5 kw, 3 ph. 480 v, 60 hz induction motor?..

Answer / s.k.sharma

MCB are used for small power application; usually used in the household appliances current rating is 5A.
MCCB are used in high power application in generation station above 100A;Rarely used but the most common used in industries is MPCB variable Rating of current adjust according to the load current of the the appliances. don't know about the ELCB just cheak out on Wikipedia...

Is This Answer Correct ?

10 Yes

22 No

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