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    Float Switches

    What is a Float Switch?

    A float switch is a level sensor used to detect the level of liquid usually in a tank, container or well. The flotation part of the device sits on top of the liquid and will switch on the rise and fall of the liquid. Float switches are used for automatic level control of groundwater, wastewater, and sewage pumps, for raw water and liquid transfer pumps at waterworks, and for high water alarm.

    How does a Float Switch work?

    Float switches have a reed switch and a pivoted magnet and can be used for normally open (N/O) or normally closed (N/C) operation. The switch action can be reversed rotating the switch through 180°.

    The switch sits on top of a water level and the changing fluid level will cause the reed change to work (for instance close or open) at a specific level. The internal mechanical switch opens or closes the electrical circuit with gravity which enables it to turn equipment on and off such as a water pump.

    What materials are float switches made of?

    • Nylon – used for oils, diesel, organic chemicals.
    • Polypropylene (PP) – acids and alkali, detergents, oils, water, organic chemicals.
    • Polyphenylene sulphide (PPS) – used for more aggressive chemicals, and higher temperatures, up to 120ºC.
    • Stainless steel – medical and food industries, hydraulic fluids, chemicals.

    Features and Benefits

    • Highly Flexible
    • High Mechanical Load Rating
    • Insensitive to Turbulence
    • Shock and Rupture Proof
    • WRAS approvals

    Applications of Float Switches

    Float Switches can be used in several situations, some of which include:

    • Sump Pits
    • Fuel Tanks
    • Coolant Tanks
    • Oil/Water Separators
    • Wastewater and Sewage Treatment

    Browse the broad range of Float Switches RS Group has to offer and order today for next day delivery

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    Device Type
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    Mounting Type
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    Maximum DC Voltage
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    Series
    RS PRO
    Float
    -
    Vertical
    Direct Load
    Stainless Steel
    300mm
    -10°C
    +120°C
    300V
    300V
    500 mA
    10bar
    -
    -
    -
    -
    RS PRO
    Float
    -
    Vertical
    Direct Load
    PP
    300mm
    -20°C
    +80°C
    250V
    200V
    700 mA
    -
    -
    -
    -
    -
    RS PRO
    Float
    -
    Vertical
    Direct Load
    PP
    300mm
    -20°C
    +80°C
    140V
    200V
    1 A
    -
    -
    -
    -
    -
    RS PRO
    Float
    -
    Horizontal
    NO
    Stainless Steel
    300mm
    -40°C
    +125°C
    250V
    200V
    500 mA
    10bar
    Silicone
    -
    -
    -
    RS PRO
    Float
    -
    Vertical
    Direct Load
    PP
    300mm
    -20°C
    +80°C
    250V
    200V
    700 mA
    -
    -
    -
    -
    -
    RS PRO
    Float
    -
    Vertical
    Direct Load
    PP
    300mm
    -20°C
    +80°C
    140V
    200V
    700 mA
    -
    -
    -
    -
    -
    RS PRO
    Float
    -
    Vertical
    NO/NC
    Stainless Steel
    300mm
    -40°C
    +125°C
    250V
    200V
    2 A
    -
    -
    -
    -
    -
    RS PRO
    Float
    -
    Horizontal
    Direct Load
    Stainless Steel
    300mm
    -10°C
    +120°C
    300V
    300V
    500 mA
    10bar
    -
    -
    -
    -
    RS PRO
    Float
    -
    Vertical
    Direct Load
    PP
    300mm
    -20°C
    +80°C
    130V
    180V
    700 mA
    -
    -
    -
    -
    -
    RS PRO
    Float
    -
    External
    NO/NC
    Polypropylene
    1m
    -20°C
    +100°C
    240V
    120V
    600 mA
    -
    Silicone
    -
    -
    -
    RS PRO
    Float
    -
    External
    NO/NC
    Nylon
    -
    -20°C
    +75°C
    240V
    120V
    600 mA
    -
    Nitrile
    -
    -
    -
    RS PRO
    Float
    -
    Threaded
    NO/NC
    Nylon
    -
    -20°C
    +75°C
    240V
    120V
    600 mA
    -
    Nitrile
    -
    -
    -
    RS PRO
    Float
    Liquid Level Control
    Threaded
    NO
    Stainless Steel
    350mm
    -20°C
    +110°C
    -
    -
    -
    -
    Silicone
    -
    -
    -
    RS PRO
    Float
    -
    Horizontal
    NO/NC
    Polypropylene
    1m
    -20°C
    +100°C
    240V
    120V
    600 mA
    -
    -
    -
    -
    -
    RS PRO
    Float
    -
    External
    NO/NC
    Polypropylene
    -
    -20°C
    +100°C
    240V
    120V
    600 mA
    -
    Nitrile
    -
    -
    -
    RS PRO
    Float
    -
    Threaded
    NO/NC
    Polypropylene
    -
    -20°C
    +100°C
    240V
    120V
    600 mA
    -
    Nitrile
    -
    -
    -
    RS PRO
    Float
    -
    Horizontal External
    SPNO
    Nylon
    -
    -20°C
    +75°C
    240V
    120V
    600 mA
    -
    -
    -
    -
    RSF80
    RS PRO
    Float
    Liquid Level Control
    Vertical
    NO
    Stainless Steel
    350mm
    -20°C
    +85°C
    -
    -
    -
    -
    Silicone
    -
    -
    -
    RS PRO
    Float
    -
    Vertical
    NO/NC
    Nylon
    1m
    -20°C
    +75°C
    240V
    120V
    600 mA
    -
    -
    -
    -
    RSF50
    RS PRO
    Float
    Liquid Level Control
    Side Mounted
    NO
    PA66+GF20
    1m
    -20°C
    +75°C
    -
    -
    -
    -
    -
    -
    -
    -
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