Capacitor contactors with damping resistors make use of pre-switching auxiliary contacts and are used in PFC systems with slowly changing loads. They close before the main contacts and pre-load the capacitor in order to prevent current peak values. This has a significant positive influence on the life expectancy of the capacitor and also positively impacts the power quality (by avoiding transients and voltage drops that otherwise may be caused by switching in capacitors). Capacitor contactors are available for PFC systems with or without reactors. The broad range covers rated voltages from 400 V to 690 V and outputs from 12.5 to 100 kvar.