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

    Telemecanique Sensors
    Plunger
    4P
    NO/NC
    IP66
    10A
    Zinc Alloy
    240V
    250V
    -
    OsiSense XC
    Snap Action
    81mm
    72mm
    36mm
    -
    +70°C
    -25°C
    -
    Telemecanique Sensors
    Roller Plunger
    DP
    NO/NC
    IP66, IP67, IP68
    1.5A
    Zinc Alloy
    240V
    250V
    M12
    OsiSense XC
    Snap Action
    50mm
    30mm
    16mm
    -
    +70°C
    -25°C
    -
    Bernstein AG
    Roller
    DPST
    NC/NO
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    240V
    -
    M16
    TI2
    Slow Action, Snap Action
    30mm
    63.3mm
    27mm
    -
    +80°C
    -30°C
    -
    Omron
    Roller Plunger
    SPDT
    NO/NC
    IP00
    15A
    Thermosetting Resin
    500V
    250V
    Screw
    Z
    Snap Action
    49.2mm
    25.5mm
    17.45mm
    -
    +80°C
    -25°C
    CSA Certified
    Omron
    Roller Lever
    SPST
    1NC/1NO
    IP67
    10A
    Plastic
    240V
    -
    Terminal Block
    D4N
    Slow Action
    -
    -
    -
    -
    +70°C
    -30°C
    -
    Siemens
    Roller Lever
    -
    NO/NC
    IP66, IP67
    6A
    Metal
    400V
    400V
    M20
    3SE5
    Snap Action
    119.5mm
    37.3mm
    40.5mm
    -
    +85°C
    -25°C
    CCC, CE, CSA, UL
    Eaton
    Plunger
    DPST
    2NO
    IP66, IP67
    6A
    Metal
    400/415V
    220V
    M20
    -
    Slow Action
    31mm
    76mm
    33.5mm
    -
    +70°C
    -25°C
    -
    Schmersal
    Plunger
    DP
    NO/NC
    IP67
    -
    Metal
    230V ac
    24V dc
    M20
    EX-ZS 335
    Snap Action
    66.5mm
    40.5mm
    38mm
    ATEX
    +60°C
    -20°C
    -
    Honeywell
    Roller Plunger
    SPDT
    NO/NC
    IP65, IP66, IP67, IP68
    5A
    Die Cast Zinc
    240V
    -
    Cable
    14CE
    Snap Action
    49mm
    40mm
    16mm
    -
    +70°C
    0°C
    -
    Omron
    Roller Lever
    SPDT
    NO/NC
    IP67
    10A
    Die Cast Aluminium
    600V
    250V
    PG13.5
    WL
    Snap Action
    96.7mm
    40mm
    42mm
    -
    +80°C
    -10°C
    CE
    Omron
    Roller Lever
    SPDT
    NO/NC
    IP62
    15A
    Thermosetting Resin
    500V
    250V
    Screw
    -
    Snap Action
    49.2mm
    39.4mm
    17.45mm
    -
    +80°C
    -15°C
    CCC, CE, CSA, UL
    Honeywell
    -
    DPDT
    2NO/2NC
    -
    10A
    Stainless Steel
    600V
    250V
    3/4 in NPT
    HDLS
    Snap Action
    122.96mm
    1.875in
    2.437in
    -
    +121°C
    -12°C
    -
    Telemecanique Sensors
    Roller Plunger
    DP
    NO/NC
    IP65
    10A
    Plastic
    240V
    250V
    PG11
    OsiSense XC
    Snap Action
    30mm
    30mm
    85mm
    -
    +70°C
    -25°C
    -
    Omron
    Plunger
    SPDT
    NO/NC
    IP00
    15A
    -
    500V
    250V
    -
    Z
    Snap Action
    47.3mm
    49.2mm
    17.45mm
    -
    +80°C
    -25°C
    CCC, CE, CSA, UL
    RS PRO
    Roller Lever
    DPST
    NO/NC
    IP66
    10A
    Zinc Alloy
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    124mm
    32.5mm
    -
    +70°C
    -25°C
    -
    Bernstein AG
    -
    -
    NC
    IP65
    -
    Thermoplastic
    -
    -
    -
    SK series
    -
    52mm
    29mm
    15mm
    -
    -
    -
    -
    Omron
    Coil Spring
    SPST
    NO/NC
    IP67
    10A
    -
    500V
    250V
    PG13.5
    WL
    Snap Action
    40mm
    42mm
    203.7mm
    -
    +85°C
    -10°C
    CE
    Honeywell
    Fork Roller Lever
    SPDT
    NO/NC
    IP67
    10A
    Die Cast Zinc
    480V
    550V
    -
    LS
    Snap Action
    116.6mm
    48.8mm
    91.4mm
    -
    +71°C
    -29°C
    CE Certified, EN 60947-5-1, IEC 60947-5-1
    Omron
    Roller Lever
    SPDT
    NO/NC
    IP00
    15A
    -
    500V
    250V
    -
    Z
    Snap Action
    39.4mm
    49.2mm
    17.45mm
    -
    +80°C
    -25°C
    CCC, CE, CSA, UL
    Omron
    Roller Lever
    SPDT
    NO/NC
    IP67
    -
    -
    250V
    -
    PG13.5
    D4N
    Snap Action
    73mm
    31mm
    47mm
    -
    +70°C
    -30°C
    CSA, cULus, UL
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