Why to oversize the Softstarter used in a standard 400 V application, in case of using a bypass contactor? | Schneider Electric Egypt and North East Africa

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Why to oversize the Softstarter used in a standard 400 V application, in case of using a bypass contactor?

In typical applications, may be the word oversizing could be not that accurate, because actually by bypassing the starter in a standard application & the motor always started from cold state, we can use the soft starter with one rating smaller in KW than without bypass.