Switch Terminology

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xPyT = x Poles, y Throws

The number of poles is the number of separate switches that a single switch contains. A 3P switch is the equivalent of 3 separate switches in one package. The number of throws is the number of different lines that an incoming pole can be switched to. A 1P4T switch can switch a single incoming pole to any of four different lines.

SwitchExamples.jpg

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