用于继电保护与自动控制系统中，以增加触点的数量及容量。 它用于在控制电路中传递中间信号。中间继电器的结构和原理与交流接触器基本相同，与接触器有一定区别。 中间继电器 只能用于控制电路中。因为接触器的主触头可以通过大电流，而中间继电器的触头只能通过小电流。所以， 它一般是没有主触点的，因为过载能力比较小。所以它用的全部都是辅助触头，数量比较多。新国标对中间继电器的定义是K，老国标是KA。 中间继电器

一般是直流电源供电。少数使用交流供电。一般情况下把你需要扩大或扩充的接点串接到中间继电器的控制线圈，然后中间继电器的接点就可以用起来了

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