I needed a breaker for a Crouse-Hinds panel, did a search, and found this thread.
As taken from a Cutler-Hammer
.PDF document :
Specified Circuit Breaker – each
manufacturer lists the brands of circuit
breakers that can be used in their
panelboards. Often, manufacturers will
not list competitors as specified, even
though they are suitable replacements.
UL Classified Circuit Breaker – a
breaker that is considered suitable, by
Underwriters Laboratory, for use in
place of the specified circuit breaker.
Listed Breaker – According to the
NEC®, the listing of a product is by an
independent third party. Cutler-
Hammer Classified Breakers are listed
by UL.
Labeled Breaker - A breaker with a
label affixed by an independent third
party.
It's probably cheaper to just buy a Murray breaker for a Crouse-Hinds panel. Aren't they the replacement?