In early days, there used to be electromechanical relay of induction disk - type .

在早年, 曾是感应盘 式 机电继电器.

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A contactor is a special type of electromechanical relay, the contacts are attached to the armature.

接触器是一种特殊类型的机电式继电器, 其触点被安装在枢轴机构上.

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