An electrical switch assembly including a plurality of main electrical switches, an operating
device for opening and closing the main switches, and a single interrupter switch connected
in parallel with the main switches and operable by the operating device. The interrupter
switch opens only after any of the main switches opens, so that the single interrupter switch
serves as the arcing contacts for all of the main switches. The operating device may include
a shaft which is rotatable to operate the main switches and which is shiftable longitudinally …