中间继电器和接触器工作原理一样 接触器有主辅触点之分 主触点为三个用于三相主回路 接触器主要作用是用于控制功率回路通断的 辅助点的容量要小用于控制回路 而中继触点容量都是一样的 都不大 它用在复杂控制系统中触点数量不够 或需要加大控制信号的场合 比如用PLC 控制一台大功率电机 电机通断由接触器控制 但是PLC 输出点容量太小 不能直接控制接触器线圈 这时需要用中继进行一级或多级信号放大

当然中继也可以代替接触器控制小功率电机

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