The capacitor itself has the effect of storing charge. When the capacitor stores the charge, it is connected to the AC circuit, the voltage across the capacitor will exceed the rated voltage.  If the capacitor is just disconnected from the power supply and then closed, the capacitor will withstand more than twice the rated voltage. This can blow the capacitor or cause the circuit breaker to trip.  Therefore, the electric circuit cannot be Closed when Parallel capacitor bank With charge.

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