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。
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.
调节整定电流时,瞬时脱扣电流应大于短延时脱扣电流,短延时脱扣电流应大于长延时脱扣电流。
When regulating current, the instantaneous tripping current must larger than the short time delay current must larger than the long time delay tripping current.
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