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  1. IsoPower

    When do I use a 4 pole breaker or disconnect?

    A 4-pole breaker or disconnect is required for 3-phase ungrounded systems in Europe where they are allowed to have a neutral conductor. A neutral conductor is not allowed in the U.S., therefore, there would not be a reason for using a 4-pole breaker. The 4th pole is necessary when using a...

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