In star delta circuit for motors if star contactor is of 50kw and main and delta contactor is of 100 kw ? can i run motor ?

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If you have motors 100kW, than main and delta contactors are 0,57*100kW and star contactor 0,33*100kW, use this simple formula and you will not make mistake.

It is a good practice that you choose contactors for one step higher in compare to calculation.

brother to start a motor it is depend on the the design ratio called starting KVA OR INRUSH then multiplied by the rated current that is the right and save starting current ,the code letter it should be mentioned in the name plate as  a letter A  or B or ...... V  each letter has a number  (sKVA / HP ) you can find the code table by searching engine  

 

 

YES WE CAN RUN  in star  voltage is root of times current is line current to reduce  staring current 

in delta voltage i s line voltage current is root of three times 

I THANK YES BECAUSE STAR CONTACTOR RTATED HI AMPER CURRENT AT SHORT TIM .  

I think yes! Because STAR contactor current less than DELTA current in1,73 times. In Cirquit diagrams star-delta combination (any manufactures) determines STAR contactor less than DELTA one. 

In star delta if a motor start  we need double power to rotated   as DOUBLE IN KILO WATTS.

at star delta connection there are three main contactors and a timer often

1_the delta power and it could be the main if it individual 

2_star

3_and delta

4_timer

then when we supplying current  the motor begin with a star 

then after the adjusted time which means that the motor runs in steady state the two contactors of delta begin to work each of them carry the half current of star contacor 

 

 it's about the current that the motor draws at the end