High voltage vacuum contactor / relay
40 kV, max. 40 000 A | HA series
Ross Engineering
This series of vacuum contactors includes heavy and very heavy duty types normally used at 400 to 2,000 amps continuous and 4,000 to 28,000 amps AC interrupt. Some are also used in conjunction with higher current shunt switches to give continuous duty as high as 36,000 amps RMS where only moderate current is present during interruption. Some types are also used for higher current DC interruption aided by a counter-pulse system which creates artificial current zeros across the contacts during contact parting. Up to 40,000 amps DC at 40,000 volts has been interrupted by this method.
