Arcing time of high-voltage air-break contactors at low currents

A high-voltage air-break contactor must be able to interrupt the circuit to motor loads or static loads covering a wide current range. Considerable attention has been given to the ability of contactors to interrupt fault currents, but little has been published on the problem of obtaining satisfactory performance at low currents. The difficulty at low currents is one of getting acceptably short arcing time.