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.

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