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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. M

    Clock stopped on boiler.

    Hi, I have a Worcester Bosch Greenstar 30Si combi boiler, the analog clock has stopped and the On-Timer-Off switch only works on Timer setting,. So I have set all the little timer switches to ON and the boiler does work then. Any help or source for a new clock would be great. TIA
  2. C

    Faulty surestop switch

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  3. S

    Firebird condensing boiler

    Hi there As you can see from the video below, our pump exploded. The question I have is, this pump is added to a firebird condensing boiler and when we found this mess the boiler and pump were stil operating but the pressure in the boiler was reading 0. Should the pressure switch have kicked in...
  4. S

    Dual immersion heater with sink/bath switch

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  5. H

    Worcester Bosch Oil Heatslave Switch On Problem

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  6. ridgerunner

    Will switch to unvented HW cylinder reduce shower performance

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  7. B

    Surestop water switch.

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  8. J

    Hyco Electric Boiler - switch off for occasional use?

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  9. S

    does the power switch to the cylinder need to be left on ?

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  10. B

    Unable to switch off external stop valve

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  11. P

    HELP NEEDED DO I SWITCH FROM AN ELECTRIC BOILER TO GAS

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  12. T

    Drain Central Heating System- when is it safe to switch Boiler back on

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  13. H

    Switch off Alpha weather prod sensor.

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  14. M

    Immersion Heated Switch

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  15. W

    Oil Central Heating Switch

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  16. C

    Set fan operation switch

    Hi, here is my question: my house 's central air conditioner has gas Heater and electric A/C, which fan operation I should switch in the thermostat? gas or electric? here are the manual instructions: Set Fan Operation Switch, Move the switch to the proper setting: - Gas or Oil: For gas or oil...
  17. V

    flow sensor and flow switch help on ecodan hybrid setup with boiler

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  18. C

    Heat Towel Rail Switch - Clicking Noise

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  19. taffyinhighlands

    parallel hot water tanks - can switch to single as well as dual use?

    I've got a DHW system with 2 storage tanks run in parallel - everything is well set up for the 2 tank operation, but other than completely removing one tank, and draining it to avoid legionella risk, is there a way I can keep both hooked up but only run the single tank (system was installed for...
  20. R

    Swapping a Danfoss valve for a Honeywell

    Kingo. Did you resolve your 3 port valveswop re wiring.
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