SPST，SPDT，DPST和DPDT是什么意思？
SP和DP是指单极和双极，ST和DT，指单掷和双掷。
极是指由开关控制的电路数：SP开关仅控制一个电路。DP开关控制两个独立的电路（并像两个机械链接的两个相同的开关一样）。不要将“极点”与“终端”混淆。例如，DPST开关具有四个终端，但它是DP，而不是4P开关。
扔指执行器的极端位置：ST开关仅在一个位置上关闭电路。手柄的另一个位置是关闭的。DT切换在向上位置以及向下位置（内）关闭电路。DT开关也可以具有中心位置（经常开放）。
Single pole/throw and double pole/throw switches are by far the most common switches, but triple and quadruple configurations are also available. They are commonly denoted 3PST, 3PDT, 4PDT, etc.
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以下开关图说明了切换和摇杆开关的最常见类型。（单击缩略图查看全尺寸图像）
SPST ON-OFF |
SPDT ON-ON
一次只能一次通电。 |
SPDT On-Ow-On-On
一次只能一次通电。 |
DPST ON-OFF
Both load terminals can be energized at the same time. They are independent of each other and could be of different voltages. |
DPDT ON-ON
Functions like two spearate SPDT switches operated by the same actuator. Only two loads can be On at a time. |
DPDT On-Own-Off
Functions like two separate SPDT switches operated by the same actuator. Only two loads can be On at a time. |