time delay opening relay
... time delay of transient recovery 瞬时恢复电压的时延 time delay opening relay 延时断路继电器 time delay push-button 延时复位按钮 ...
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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.
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