As I understand it, the circuit breaker is there to prevent the wire between the breaker and the outlet from over-heating and causing a fire.
Breakers in some equipment circuits are there primarily for short circuit interruption, any wire connected to a circuit need to be heavy enough to deliver adequate fault current to trip the breaker. 12 for up to 50, 8 for 100, depending on conductor size. Some circuits allow number 8 conductors to 100A also, each machine or connected load is different.
Also doesnt need a disconnect as this is cord and plug.
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