The present invention relates to a two-channel circuit interruption system of a distribution board, which comprises: a sensor unit including a CT sensor which senses an external accident by sensing overcurrent of a line connected to a load, and an arc sensor which senses an internal accident by sensing an arc generated inside a distribution board; a circuit interruption control unit including an accident current relay outputting an operation signal when the CT sensor senses an external accident, and an arc relay outputting the operation signal when the arc sensor senses an internal accident; and a circuit breaker formed of two channels of an open operation circuit which is cut off and driven by the operation signal of the arc relay and an operation delay circuit for delaying interruption driving time by relaying the operation signal of the accident current relay by a predetermined time. Circuit interruption time due to the external accident is delayed rather than circuit interruption time due to the internal accident.
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