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

    Omron
    Plunger
    SPDT
    NO/NC
    IP65
    15A
    -
    480V
    250V
    -
    ZE
    Snap Action
    71.3mm
    86mm
    25.4mm
    -
    +80°C
    -10°C
    CCC, CE, cULus
    Telemecanique Sensors
    Lever
    DP
    NO/NC
    IP66, IP67
    10A
    Plastic
    240V
    250V
    -
    OsiSense XC
    Snap Action
    65mm
    31mm
    30mm
    -
    +70°C
    -25°C
    -
    Siemens
    Roller Lever
    -
    NO/NC
    IP66, IP67
    24 V 6A
    Metal
    400V
    400V
    M20
    3SE5
    Snap Action
    119mm
    -
    40.5mm
    -
    +85°C
    -25°C
    CE
    Omron
    Roller Plunger
    SPDT
    4NO/2NC
    IP67
    5A
    -
    250V
    250V
    -
    -
    Snap Action
    -
    -
    -
    -
    +70°C
    -10°C
    -
    Honeywell
    Roller Lever
    SPDT
    -
    -
    15A
    Plastic
    250V
    -
    -
    BZ
    Snap Action
    41.14mm
    1.94in
    0.68in
    -
    +85°C
    -55°C
    -
    Eaton
    Roller Lever
    -
    1NO/1NC
    IP66, IP67
    4A
    Plastic
    400V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Omron
    Roller Plunger
    SPDT
    NO/NC
    IP65
    480 V ac 15 A, 125 V dc 500mA
    -
    480V
    250V
    1/2 in NPSM
    -
    -
    86mm
    44.5mm
    25.4mm
    -
    +80°C
    -10°C
    -
    Telemecanique Sensors
    -
    SPDT
    NO/NC
    IP65, IP66, IP67
    20A
    Die Cast Zinc
    600V
    600V
    M20
    9007
    Snap Action
    118.36mm
    57.15mm
    61.98mm
    -
    +85°C
    -23°C
    -
    ABB
    -
    2P
    -
    IP65
    10A
    -
    600V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Honeywell
    Roller Lever
    DPDT
    2NO/2NC
    IP67
    10A
    Die Cast Zinc
    600V
    250V
    M20
    GLA
    Snap Action
    145.8mm
    42mm
    42mm
    -
    +85°C
    -25°C
    -
    Telemecanique Sensors
    Roller
    3P
    2NO/2NC
    IP66, IP67
    6A
    Plastic
    300V
    -
    -
    -
    Slow Break
    -
    -
    -
    -
    -
    -
    -
    Honeywell
    -
    DPDT
    2NO/2NC
    IP65, IP66, IP67
    10A
    Die Cast Zinc
    600V
    250V
    3/4 in NPT
    HDLS
    Snap Action
    47.8mm
    45.3mm
    119mm
    -
    +121°C
    -12°C
    -
    Telemecanique Sensors
    Cats Whisker
    2P
    NO/NC
    IP66, IP67
    3A
    Metal
    240V
    250V
    M16
    OsiSense XC
    Snap Action
    31mm
    30mm
    65mm
    -
    +70°C
    -25°C
    -
    BALLUFF
    Plunger
    2P
    NO/NC
    IP67
    6A
    Aluminium
    250V
    -
    M20
    -
    Snap Action
    79mm
    36mm
    63mm
    -
    +85°C
    -5°C
    -
    Telemecanique Sensors
    Roller Lever
    -
    NO/NC
    IP66
    -
    Zamak Zinc Alloy
    -
    -
    1/2 in NPT
    OsiSense XC
    Snap Action
    84mm
    42.5mm
    36mm
    -
    +70°C
    -25°C
    -
    Siemens
    Roller
    -
    2NO/1NC
    IP66, IP67
    4A
    Metal
    250V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    Eaton
    -
    4P
    NO/NC
    IP66
    40A
    Polyester
    690V
    -
    Screw
    GHG 262
    -
    102mm
    84mm
    112mm
    ATEX
    +40°C
    -20°C
    -
    Telemecanique Sensors
    Rod
    4P
    2NC
    IP65
    10A
    Plastic
    240V
    125V
    M20
    OsiSense XC
    Slow Action
    200mm
    57mm
    200mm
    -
    +70°C
    -25°C
    -
    Bernstein AG
    Plunger
    DPST
    NC/NO
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    240V
    250V
    M16
    TI2
    Slow Action, Snap Action
    30mm
    57mm
    27mm
    -
    +80°C
    -30°C
    -
    Honeywell
    Adjustable Roller Lever
    SPDT
    NO/NC
    IP67
    6A
    Die Cast Zinc
    300V
    250V
    PG13.5
    GLE
    Snap Action
    139mm
    65mm
    30mm
    -
    +85°C
    -40°C
    -
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