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。
Based on the analysis of heat transfer process in explosive circuit-breaker, a thermal model of circuit-breaker is proposed in this paper.
通过对爆炸式开关的热学分析，考虑开关内部传导散热和外表面的对流和辐射散热，建立了开关的瞬态热分析模型。
CM3 molded case circuit breaker (MCCB) with thermal overload alarm but non-release function was introduced. It integrates part function of thermal overload relay and function of MCCB.
介绍了一种具有热过载报警不脱扣功能的CM 3塑料外壳式断路器，其将热过载继电器的部分功能与MCCB的功能有机地结合在一起。
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