描述
优点是不同公共点之间可带不同的交、直流负载，且电压也可不同，带负载电流可达2A／点；但继电器输出方式不适用于高频动作的负载，这是由继电器的寿命决定的。其寿命随带负载电流的增加而减少，一般在几十万次至Jl百万次之间，有的公司产品可达1000万次以上，响应时间为10ms。
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