switch

When a capacitance is switched to an AC system, the result is a resonant circuit damped to a greater or lesser degree. In addition to the nominal current, the capacitor accepts a transient current that is a multiple of (as many as 200 times) its nominal current. Fast switching, low-bounce contactors should be used, observing the swithing capacity for capacitive currents stated by the producer. Recommended are special capacitor contantors with leading contacts that feature precharging resistors to damp inrush currents