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For ATS48 If my application is standard , and i use a bypass contactor , is it obligatory to apply the derating factor or the starter will withstand ?

Yes even if you use soft starter with bypass, de-rating factor is mandatory if the soft starter is used beyond the catalog specified limits(temperature, altitude, etc...)

If you use ATS48C11Q soft starter for standard application (ILT = 300%, Class10 (for 12 sec)) with bypass contactor, It can be used up to 110A current rating with 50 degree C Ambient temperature. The de-rating factor should be applied above this limits.
 
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