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2. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   These switches appear externally similar to single pole, single throw (SPST) switches, but have extra connections which allow a circuit to be controlled from multiple locations. Toggling the switch disconnects one "traveler" terminal and connects the other. Electrically, a typical "3-way" switch is a single pole, double throw (SPDT) switch. By ...

3. Double switching - Wikipedia

   en.wikipedia.org/wiki/Double_switching

   A double-switched relay cannot close inadvertently with the application of the same current. At least two separate faults would be required to allow this relay to close inadvertently. Double switching , double cutting , or double breaking is the practice of using a multipole switch to close or open both the positive and negative sides of a DC ...

4. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   For example, a "2-pole" switch has two separate, parallel sets of contacts that open and close in unison via the same mechanism. The number of "throws" is the number of separate wiring path choices other than "open" that the switch can adopt for each pole. A single-throw switch has one pair of contacts that can either be closed or open.

5. RF switch - Wikipedia

   en.wikipedia.org/wiki/RF_switch

   Below is a list of typical switch configurations and usage: Single pole, double throw (SPDT or 1:2) switches route signals from one input to two output paths. Single pole double throw (SPDT) switch from Agilent Technologies. Multiport switches or single pole, multiple throw (SPnT) switches allow a single input to multiple (three or more) output ...

6. Railroad switch - Wikipedia

   en.wikipedia.org/wiki/Railroad_switch

   A double switch, or double slip—the points are set to connect the upper left and lower right tracks. A double slip switch (double slip) is a narrow-angled diagonal flat crossing of two lines combined with four pairs of points in such a way as to allow vehicles to change from one straight track to the other, alternatively to going straight ...

7. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   Shown here will be fastened to this recessed, non-metallic box, then a cover plate is installed. This "double gang" (two unit) installation uses non-metallic-sheathed cable and twist-on wire connectors. In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical ...

8. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   SPST-NC (Single-Pole Single-Throw, Normally-Closed) relays have a single Form B or break contact. As with an SPST-NO relay, such a relay has four terminals in total. SPDT (Single-Pole Double-Throw) relays have a single set of Form C, break before make or transfer contacts. That is, a common terminal connects to either of two others, never ...

9. Electrical wiring in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_the...

   Single-pole switches are most commonly used to control circuits. These switches isolate only the line conductor feeding the load and are used for lighting and other smaller loads. For larger loads like air conditioners, cookers, water heaters and other fixed appliances a double-pole switch is used, which also isolates the neutral for greater ...