Disconnects Come in All Shapes and Sizes
When dealing with low, medium, or high AC voltages (or DC voltages for
that matter), removing power from the circuit is crucial for any
maintenance, servicing, or installation operation.
Most of the
disconnects I've dealt with through the years have been fused and
non-fused safety switches, switchgear disconnects, and disconnects
mounted on starter buckets. Of course, circuit breakers are also a form
of disconnect, but not normally designated as such.