This is an extension of the isolator, in that the load side of the supply is
interrupted by a fuse in the phase conductor.
Fuse switch
Fuse switches are used on three-phase systems. Here, the fuse forms part
of the moving operating blade.
Consumer unit
The consumer unit is found in nearly all domestic installations. It
consists of a double-pole isolator and a distribution board in one
assembly.
Circuit breaker
The mec ns of isolation must be double- or triple-pole. Some modern
consumer units have a residual current device installed in place of the
usual isolator.
Sequence of control
Diagram 83a—c illustrate ...
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