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

    Lever
    SPDT
    2NC
    IP66
    3A
    Zinc Alloy
    250V ac
    -
    M20
    -
    -
    -
    -
    -
    -
    +70°C
    -25°C
    -
    Siemens
    Roller Lever
    -
    1NC/1NO
    IP66, IP67
    6A
    Metal
    400V
    -
    -
    3SE5
    Snap Action
    -
    -
    -
    -
    -
    -
    -
    Telemecanique Sensors
    -
    DP
    NO/NC
    IP66
    10A
    Zinc Alloy
    240V
    250V
    Cable
    OsiSense XC
    Snap Action
    64mm
    58.5mm
    30mm
    -
    +70°C
    -25°C
    -
    Omron
    Hinge Roller Lever
    SPDT
    NO/NC
    IP62
    15A
    -
    500V
    250V
    -
    Z
    Snap Action
    39.4mm
    49.2mm
    17.45mm
    -
    +80°C
    -15°C
    -
    Siemens
    Roller Lever
    DPST
    NO/NC
    IP65
    -
    Plastic
    400V
    400V
    M20
    3SE5
    Snap Action
    75.7mm
    31mm
    33mm
    -
    +85°C
    -25°C
    -
    Bernstein AG
    Plunger
    DPST
    2NC
    IP67
    5A
    Glass Fibre Reinforced Thermoplastic
    240V
    24V
    M20
    IN62
    Slow Action, Snap Action
    31mm
    74mm
    30.3mm
    -
    +75°C
    -30°C
    -
    Roller Lever
    -
    NO/NC
    IP67
    10A
    Glass Reinforced Plastic (GRP)
    600V
    -
    M20
    -
    Snap Action
    31mm
    31mm
    89mm
    -
    +80°C
    -25°C
    -
    Omron
    Roller
    SPDT
    NO/NC
    IP00
    15A
    -
    500V
    250V
    -
    Z
    Snap Action
    58.9mm
    49.2mm
    17.45mm
    -
    +80°C
    -25°C
    CE
    Bernstein AG
    Roller Lever
    DPST
    NC/NO
    IP66, IP67
    5A
    Glass Fibre Reinforced Thermoplastic
    240V
    24V
    M20
    IN65
    Slow Action, Snap Action
    31mm
    90mm
    30.3mm
    -
    +75°C
    -30°C
    -
    Siemens
    Spring Lever
    -
    1NC/1NO
    IP66, IP67
    6A
    Metal
    400V
    -
    -
    3SE5
    Snap Action
    -
    -
    -
    -
    -
    -
    -
    Telemecanique Sensors
    Plunger
    -
    1NC/1NO
    IP66, IP67
    10A
    Metal
    -
    -
    -
    -
    Snap Action
    -
    -
    -
    -
    -
    -
    -
    Honeywell
    -
    SPDT
    NO/NC
    IP67
    6A
    Die Cast Zinc
    300V
    250V
    PG13.5
    GLE
    Snap Action
    106.5mm
    65mm
    30mm
    -
    +85°C
    -40°C
    -
    Bernstein AG
    Plunger
    -
    NO/NC
    IP65
    -
    Glass Reinforced Plastic (GRP)
    -
    -
    -
    SK
    -
    90mm
    52mm
    33.5mm
    -
    -
    -
    -
    Schmersal
    Plunger
    -
    2NO
    IP65
    4A
    Aluminium
    230V ac
    -
    -
    EX-T
    -
    -
    -
    -
    -
    -
    -
    -
    Siemens
    Roller Lever
    -
    2NO/1NC
    IP66, IP67
    4A
    Plastic
    250V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    Honeywell
    Roller Plunger
    SPDT
    NO/NC
    IP67
    6A
    Metal
    240V
    250V
    Cable
    NGC
    Positive Break, Snap Action
    30mm
    16.7mm
    71.1mm
    -
    +75°C
    -25°C
    CCC, CE, IEC 60529
    Telemecanique Sensors
    -
    SP
    NO/NC
    IP65
    10A
    Metal
    240V
    -
    -
    OsiSense XC
    Snap Action
    77mm
    40mm
    44mm
    -
    +70°C
    -25°C
    -
    Schmersal
    Roller Lever
    -
    1NO/1NC
    IP65
    4A
    Die Cast Zinc
    230V ac
    -
    -
    EX-T
    -
    -
    -
    -
    -
    -
    -
    -
    Telemecanique Sensors
    Rod
    DP
    1NC/1NO
    IP66
    10A
    Metal
    500V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Telemecanique Sensors
    Roller
    -
    2NC/1NO
    IP66, IP67
    6A
    Plastic
    -
    -
    -
    -
    Snap Action
    -
    -
    -
    -
    -
    -
    -
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