Uses 4-wire connection with 2 wires to line voltage and 2 wires to SPST control switch.
采用4线，2线连接到线电压，2线连接到单刀单掷控制开关。
The Shunt configured switch of SPST and SPDT are implemented and measured.
并有实作与量测并联式的单刀单掷和单刀双掷开关。
Two dual SPST switches, low-voltage, bidirectional RF/video switch.
两个双SPST开关，低电压，双向RF /视频开关。
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