formula for incomer breaker size calculation of powerfactor
correction unit

Answer Posted / mohan

Amps Per KVAR is between 1.1 to 1.3 Amps

for a 300KVAR panel

the current shall be 130 AMPs(and if the capacitors are
auto swithced , then switching surges need to be considered
hence) * 1.5 Times = 585Amps
The nearest breaker size is 630AMPS

It is preferable to use Capcitor duty contactor for
switching

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