how to find motor contactor rating and bimetalic relay rating? of 30kw mo

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Question

how to find motor contactor rating and bimetalic relay 
rating? of 30kw motor which will operate on star-delta 
starter?

Question Submitted By :: Snr3032

I also faced this Question!!

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Answer Posted By

Re: how to find motor contactor rating and bimetalic relay rating? of 30kw motor which will operate on star-delta starter?

Answer
# 1

40 hp motor full load current appx 52amps so we have use 
2.5 times relay rating and power contactor rating.

Is This Answer Correct ?

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0 No

Sanjay

Re: how to find motor contactor rating and bimetalic relay rating? of 30kw motor which will operate on star-delta starter?

Answer
# 2

Full Load Current of Motor-52Ampas per(415.1.732.0.8)

Usually we are using any protective divece/conducter 1.5 
time of higher side.then Contactor Carrying Capacity Will 
be-80amp and Over Load relay Capaciry wil be-80 Amp and its 
over load setting will be-30 amp as per (LI/1.732)

Is This Answer Correct ?

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0 No

Thakur

Re: how to find motor contactor rating and bimetalic relay rating? of 30kw motor which will operate on star-delta starter?

Answer
# 3

You can use Type2 coordination table to find out the
contactor rating and OLR rating.
Normally the OLR should be set at the Full load current
rating of the motor. Hence the OLR may be selected such that
the motor flc lie in the mid range of the relay span

Is This Answer Correct ?

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0 No

Elangovan T

Question	Asked @	Answers
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