CPC H01H 39/004 (2013.01) | 17 Claims |
1. An arc quenching device for a three-phase electrical switchgear, the device comprising:
a first busbar, a second busbar and a third busbar, each of a respective phase of the three-phase switchgear;
at least one piston of an electrically conductive material and having a tapered shape, tapering towards its front end; and
only one pyrotechnical actuator arranged to, when the pyrotechnical actuator is fired, axially move each of the at least one piston until all of the first, second and third busbars are short-circuited to each other via the at least one piston; and
a protective earth busbar arranged such that, when the pyrotechnical actuator is fired, each of the at least one piston is axially moved until each of the at least one piston contacts the protective earth busbar such that each of the first, second and third busbars are also short-circuited to the protective earth busbar via the at least one piston.
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