Contactor

When a capacitor is switched to an AC voltage, the result is a resonant circuit damped to a greater or lesser degree. In addition to the rated current, the capacitor accepts a transient current that is a multiple of (as many as 200 times) its rated current.

Fast switching, low-bounce contactors should be used.

Capacitor Contactors are suitable for switching low−inductive and low−loss 3 phase capacitors in capacitor banks, without and with reactors.

Capacitor Contactors are designed to meet Capacitor Duty application. Contactors are fitted with block of three early make auxiliary contacts in series with six quick discharge damping resistors − 2 per phase.

These auxiliary contacts limit peak current in first stage of switching. Subsequently the nominal current is transferred through main contacts which are switched in next stage and the auxiliary contacts are switched−off at the same time.

This feature of the capacitor contactors guarantees effective, stable operation throughout useful life.