描述
继电器结构示意图，它主要由电磁线圈、铁心、触点和复位弹簧组成。继电器有两种不同的触点，在线圈断电时处于断开状态的触点称为常开触点(如图1-2中的触3，4)，处于闭合状态的触点称为常闭触点(如图1-2中的触点1，2)。
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