Single Pole Double Throw

A two-position switch or relay contact where the common pin is connected to the NO pin when the switch is not activated, and to the NC pin when the switch is activated.

Also known as a Form C contact or a three-way switch (US) or two-way switch (UK).

Other common switch contact arrangements are the SPST (single-pole, single-throw - a regular light switch) and DPDT (double-pole, double throw - a reversing switch).

Switch - Wikipedia lists examples of numerous switch types.

This page has been seen 881 times.

    • Created by on

Industry Advertising

Recent Activity

Readability Information

An automated review of this page attempts to determine its readability in English (US). The page contains roughly 85 words across 5 sentences.
Readability score
Readability score: 57.20
Grade level
For the information in this page to be accessible to the widest audience of readers, both a high readability score and a low grade level are ideal.

Icon Legend

  • Normal page
  • Color code

    • Content has new updates
    • Content has no updates

CB Advertising

Sign up to Advertise Today