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2. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   Instead of running mains voltage to the switches, a low voltage—typically 24 V AC—is connected to remote momentary toggle or rocker switches. The momentary switches usually have SPDT contacts in an (ON)-OFF-(ON) configuration. Pushing the switch actuator in one direction causes the relay contacts to close; pushing it in the opposite ...

3. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   A DPDT switch has six connections, but since polarity reversal is a very common usage of DPDT switches, some variations of the DPDT switch are internally wired specifically for polarity reversal. These crossover switches only have four terminals rather than six. Two of the terminals are inputs and two are outputs.

4. File:DPDT-symbol.svg - Wikipedia

   en.wikipedia.org/wiki/File:DPDT-symbol.svg

   Diagram of a DPDT switch: Date: 9 July 2006: Source: Own work: Author: Iainf: SVG development . The SVG code is . This circuit diagram was created with Inkscape.

5. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   A toggle light switch Internal components of a toggle switch. The toggle mechanism provides "snap-action" through the use of an "over-center" geometry. The design was patented in 1916 by William J. Newton and Morris Goldberg. [2] The switch actuator does not control the contacts directly, but through an intermediate arrangement of springs and ...

6. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   Circuit symbols of relays (C denotes the common terminal in SPDT and DPDT types.) Since relays are switches, the terminology applied to switches is also applied to relays; a relay switches one or more poles, each of whose contacts can be thrown by energizing the coil. Normally open (NO) contacts connect the circuit when the relay is activated ...

7. DIP switch - Wikipedia

   en.wikipedia.org/wiki/DIP_switch

   There are many different kinds of DIP switches. Some of the most common are the slide, rocker, piano (side), and rotary types. Slide / rocker / piano DIP switches are commonly available in 1 to 12 contacts (positions) SPST, [4] [5] though some are available as special order up to 30 contacts (positions).