Quote Originally Posted by dav View Post
I have what is probably a dumb question, but what is the difference between an isolator and a disconnecting device?
the other way of looking at it...a circuit breaker for example can be used as a disconnecting device if it has isolating properties for example a geyser combo breaker.

andy i would be a bit cautious including a DOL starter...in some cases i have had been instructed that an emergency stop button connected to a DOL control circuit could not be used to isolate a circuit. I cant say for sure as it was an instruction i received from an electrical engineer...it would be an interesting topic to discuss.