Protection of bus-tie circuit breakers: long time delay overcurrent and instantaneous overcurrent.

汇流排联络断路器保护：长延时过流、瞬时过流保护。

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Protection against motor over - load usually adopt thermal relay, but protection against line over - load usually adopt long delay over- current release of circuit- breaker.

电动机过载保护通常采用继电器，而配电线路过载保护多采用断路器的长延时过电流脱扣器来完成。

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