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.

    2268 Products showing for Limit Switches

    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
    Roller Lever
    DPST
    NO/NC
    IP65
    4A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    106mm
    30mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Roller Lever
    DPST
    NO/NC
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    92mm
    30mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Rod
    DPST
    NO/NC
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    230.5mm
    30mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Coil Spring
    DPST
    NO/NC
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    170mm
    30mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Adjustable Roller Lever
    DPST
    NO/NC
    IP67
    5A
    Die Cast Zinc
    240V
    250V
    Cable
    -
    -
    Snap Action
    -
    31.5mm
    158mm
    16mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Roller Lever
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    108mm
    32.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Roller Lever
    DPST
    NO/NC
    IP65
    10A
    Plastic
    400V
    250V
    M12
    -
    -
    Snap Action
    -
    30.3mm
    46mm
    171mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Roller Lever
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    94mm
    32.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Roller Lever
    -
    NO/NC
    IP67
    10A
    Glass Reinforced Plastic (GRP)
    600V
    -
    M20
    -
    -
    Snap Action
    -
    31mm
    31mm
    89mm
    -
    +80°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
    Coil Spring
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    172mm
    32.5mm
    -
    +70°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
    Plunger
    -
    NO/NC
    IP67
    -
    Glass Reinforced Plastic (GRP)
    -
    -
    -
    -
    -
    -
    -
    31mm
    31mm
    74.5mm
    -
    -
    -
    -
    RS PRO
    Roller Plunger
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    -
    Snap Action
    -
    30.3mm
    86mm
    32.5mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Coil Spring
    SPDT 1NO/1NC
    1NO/1NC
    IP67
    3A
    Die Cast Zinc
    250V ac
    -
    PG13.5
    -
    -
    Snap Action
    -
    -
    -
    -
    -
    +80°C
    -25°C
    -
    RS PRO
    Adjustable Roller Lever
    DPST
    NO/NC
    IP67
    5A
    Thermoplastic
    240V
    250V
    Cable
    -
    -
    Snap Action
    -
    31.5mm
    158mm
    16mm
    -
    +70°C
    -25°C
    -
    RS PRO
    Roller Plunger
    DPST
    NO/NC
    IP65
    10A
    Plastic
    400V
    250V
    M12
    -
    -
    Snap Action
    -
    30.3mm
    30mm
    83.5mm
    -
    +70°C
    -25°C
    -
    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
    DPST
    NO/NC
    IP67
    5A
    Thermoplastic
    240V
    250V
    Cable
    -
    -
    Snap Action
    -
    31.5mm
    60mm
    16mm
    -
    +70°C
    -25°C
    -
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