How Do Float Switches Work?

3 Answers

  • 2 months ago

    Most types now use a magnetic "reed switch", with a magnet in the moving float.

    The switch is closed if the magnet is alongside it and open otherwise; the same as a typical burglar alarm type door or window sensor switch.

    The position of the switch within the mechanism relative to the range the float can move, sets whether it's closed with the float up or down.

  • CB
    Lv 7
    2 months ago

    Youtube thumbnail

    Many types - mercury switch - NOT SO MUCH any more.....

  • fuzzy
    Lv 4
    2 months ago

    Float switch like Sump Pump? They are Mercury switches

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