Schaltvorrichtung, deren Verwendung und Verfahren zum Umschalten

摘要

A device for switching in and out a load with respect to an alternating voltage feeder has two mechanical switches (60, 61) connected in series in a current path between said load and said feeder and each having a by-pass branch with at least one member (64, 65) with ability to block current therethrough in at least a blocking direction and conduct current therethrough in at least one direction. A unit is adapted to control a procedure of a switching out and switching in by synchronization with the current in the feeder and the voltage of the feeder, respectively.