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In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type of switch is an electromechanical device consisting of one or more sets of movable electrical contacts connected to external circuits. When a pair of contacts is touching current can pass between them, while when the contacts are separated no current can flow.
Switches are made in many different configurations; they may have multiple sets of contacts controlled by the same knob or actuator, and the contacts may operate simultaneously, sequentially, or alternately. A switch may be operated manually, for example, a light switch or a keyboard button, or may function as a sensing element to sense the position of a machine part, liquid level, pressure, or temperature, such as a thermostat. Many specialized forms exist, such as the toggle switch, rotary switch, mercury switch, push-button switch, reversing switch, relay, and circuit breaker. A common use is control of lighting, where multiple switches may be wired into one circuit to allow convenient control of light fixtures. Switches in high-powered circuits must have special construction to prevent destructive arcing when they are opened.

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  1. S

    Flow switch, sheared bolts...

    Hello, failed flow switch on potterton precision boiler. British gas, sealed system. There had been some water escaping and the bolts retaining the flow switch to side of boiler became seized, I tryed penetrating oil (wd40) and they began to come out... Then sheared. They are protruding maybe...
  2. nov

    Replace old central heating timer switch with hive receiver ?

    Hi need a bit of help I have a old central heating system in my house with a back boiler. on my switch/timer on the wall i can select hot water only or hot water plus central heating I cannot select the temp here ether that's done under the fireplace. i turn dial from 1 to 4 . then my...
  3. R

    Biasi Riva Compact HE - Air Pressure Switch

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  4. J

    E9 overheat error on zone valve switch

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    • Joe50
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    • error forum overheat plumbing switch valve zone zone valve
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    • Forum: Plumbing Zone
  5. R

    CH will not switch off

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  6. E

    Honeywell cm921 problem, manual switch on ok autmatic not working.

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  7. SJB060685

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  8. P

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  9. Inverness

    Firebird combi 90 air pressure switch

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  10. H

    Stick with Oil or switch to LPG

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  11. moitruongdealvn

    Surprisingly, with the fast toilet switch, only the tape is used

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  12. MrShoes

    Is it really the timer?

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  13. Desperate_Dan

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  14. S

    Water in Air Pressure Switch pipe Potterton 80e

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  15. Stanios

    Remote Switch for Motorised Valve?

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  16. M

    Old Warmflow combi hot water flow switch alternative to over priced 1476 switch

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  17. N

    Siemens RWB2E slider switches

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  18. A

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  19. V

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  20. M

    Can i switch to cold water mains for upstairs taps

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