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。
The article analyzes the operation character and the invalidation mode of thermal over-load relay and puts forward the reliability index and the calculation method of reliability characteristic.
分析了热过载继电器的工作特点及失效模式，提出了热过载继电器的可靠性指标与其可靠性特征量的计算方法，阐述了热过载继电器的可靠性试验方法与可靠性试验设备。
The article analyzes the operation character and the invalidation mode of thermal over-load relay and puts forward the reliability index and the calculation method of reliability characteristic.
分析了热过载继电器的工作特点及失效模式，提出了热过载继电器的可靠性指标与其可靠性特征量的计算方法，阐述了热过载继电器的可靠性试验方法与可靠性试验设备。
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