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  2. Float switch - Wikipedia

    en.wikipedia.org/wiki/Float_switch

    A pedestal sump pump with a float switch. A float switch is a type of level sensor, a device used to detect the level of liquid within a tank. The switch may be used to control a pump, as an indicator, an alarm, or to control other devices. One type of float switch uses a mercury switch inside a hinged float. Another common type is a float that ...

  3. Mercury switch - Wikipedia

    en.wikipedia.org/wiki/Mercury_switch

    A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic ...

  4. Float voltage - Wikipedia

    en.wikipedia.org/wiki/Float_voltage

    Float voltage is the voltage at which a battery is maintained after being fully charged to maintain that capacity by compensating for self-discharge of the battery. [1] The voltage could be held constant for the entire duration of the cell's operation (such as in an automotive battery) or could be held for a particular phase of charging by the charger. [2]

  5. Sump pump - Wikipedia

    en.wikipedia.org/wiki/Sump_pump

    Float switches are used to automatically turn the sump pump on when water rises to a preset level. Float switches must be kept clear of any obstructions within the sump. A float guard can be used to prevent the float switch from accidentally resting on the pump housing, and remaining on. If a sump pump remains operating for a long time ...

  6. Buchholz relay - Wikipedia

    en.wikipedia.org/wiki/Buchholz_relay

    A float switch in the relay is used to initiate an alarm signal. Depending on design, a second float may also serve to detect slow oil leaks. If an electrical arc forms, gas accumulation is rapid, and oil flows rapidly into the conservator. This flow of oil operates a switch attached to a vane located in the path of the moving oil.

  7. Electrical wiring in the United Kingdom - Wikipedia

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

    A switch is a device capable of safely disconnecting the supply even if devices in the installation were drawing the full maximum load the installation was rated for. An isolator is not, it should only be used when the installation is drawing no power, i.e. the main switch in the consumer unit is off. When a supply is switched off under load ...

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