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.
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