Limit Switches, Rotary Lever & Plunger Limit Switch | RS
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    Limit Switches

    Limit switches are a contact proximity sensor device that consists of an actuator mechanically linked to a set of output contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection.

    Limit Switch Makeup

    Limit switches are made up of three key components:

    • Actuator Head - The actuator is the part of the switch that makes physical contact with the object. In some limit switches, the actuator is attached to an operating head which translates a rotary, linear, or perpendicular motion to open or close the electrical contacts of the switch.
    • Switch Body – The switch body is the component containing the electrical contact mechanism, the contacts within the body open or close the electrical circuit when the actuator is activated.
    • Receptacle/Terminals - The component containing the terminal screws or screw/clamp assembly necessary for wiring purposes.

    Actuator Types

    Limit switches are available with a wide range of actuator types. The type of actuator used can be determined by the mounting position, force required and objects to be detected.

    • Rotary Lever - with lever actuators, a cam or plate hits the end of the lever arm which in turn rotates a shaft and operates the contacts in the switch. The rotation may be spring returned (momentary) or maintained.
    • Plunger - Plunger types are best where short controlled machine movements are present or where mounting space does not permit a lever type.
    • Cat Whisker or Coil Spring – Longer actuators with a coil wire that can be moved/bent in multiple directions. Typically used in conveying applications to count objects as they pass by.
    • Forked – Used with maintained contacts, consisting of two roller levers. One roller will trip the switch and when the second is moved to the opposite direction it will reset the switch.

    2110 Products showing for Limit Switches

    RS PRO
    Roller
    SPDT
    1NC/1NO
    IP30
    10A
    Glass Reinforced Plastic (GRP)
    250V ac
    -
    Screw
    -
    Snap Action
    -
    -
    -
    -
    +80°C
    -25°C
    -
    RS PRO
    Plunger
    DPST
    NO/NC
    IP67
    5A
    Die Cast Zinc
    240V
    250V
    Cable
    -
    Snap Action
    31.5mm
    74mm
    16mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Lever
    SPDT 1NO/1NC
    NO/NC
    IP67
    10A
    Die Cast Zinc
    600V ac
    -
    PG13.5
    -
    Snap Action
    -
    -
    -
    -
    +80°C
    -25°
    -
    RS PRO
    Adjustable Roller Lever
    DPST
    NO/NC
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    170.5mm
    30mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Plunger
    SPDT
    1NO/1NC
    IP67
    3A
    Glass Reinforced Plastic (GRP)
    250V ac
    -
    PG13.5
    -
    Snap Action
    -
    -
    -
    -
    +80°C
    -25°C
    -
    RS PRO
    -
    -
    NO/NC
    IP67
    -
    Plastic
    -
    -
    M20
    -
    -
    31mm
    31mm
    95mm
    -
    -
    -
    -
    RS PRO
    Plunger
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    75mm
    32.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Plunger
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    75mm
    32.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Adjustable Roller Lever
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    172.5mm
    32.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    -
    -
    -
    IP67
    -
    Aluminium
    -
    -
    M20
    -
    -
    -
    -
    -
    ATEX
    +80°C
    -20°C
    -
    RS PRO
    -
    -
    2NC
    IP67
    -
    Plastic
    -
    -
    M20
    -
    -
    31mm
    31mm
    95mm
    -
    -
    -
    -
    RS PRO
    Roller Lever
    DPST
    NO/NC
    IP66
    10A
    Metal
    400V
    250V
    M12
    -
    Snap Action
    30.3mm
    45mm
    107.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Plunger
    DPST
    NO/NC
    IP65
    10A
    Plastic
    400V
    250V
    M12
    -
    Snap Action
    30.3mm
    30mm
    73.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Roller Lever
    -
    NO/NC
    IP67
    -
    Glass Reinforced Plastic (GRP)
    -
    -
    -
    -
    -
    31mm
    45mm
    62mm
    -
    -
    -
    -
    RS PRO
    Lever
    SPDT
    2NO/2NC
    IP67
    10A
    Die Cast Zinc
    600V ac
    -
    M20
    -
    Snap Action
    -
    -
    -
    -
    +80°C
    -25°C
    -
    RS PRO
    Roller
    SPDT
    1NC/1NO
    IP67
    3A
    Zinc Alloy
    240V ac
    -
    1m Cable
    -
    Snap Action
    -
    40mm
    16mm
    -
    +85°C
    -25°C
    -
    RS PRO
    Roller Lever
    DPST
    NO/NC
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    106mm
    30mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Plunger
    SPDT
    1NC/1NO
    IP67
    3A
    Zinc Alloy
    240V ac
    -
    1m Cable
    -
    Snap Action
    -
    40mm
    16mm
    -
    +85°C
    -25°C
    -
    RS PRO
    -
    -
    -
    IP67
    -
    Aluminium
    -
    -
    M20
    -
    -
    -
    -
    -
    -
    +80°C
    -20°C
    -
    RS PRO
    Cats Whisker
    -
    NO/NC
    IP67
    -
    Glass Reinforced Plastic (GRP)
    -
    -
    -
    -
    -
    31mm
    31mm
    172mm
    -
    -
    -
    -
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