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
    -
    SP
    NO/NC
    IP65
    3A
    Metal
    240V
    -
    Cable
    OsiSense XC
    Snap Action
    81mm
    41mm
    40mm
    -
    +70°C
    -25°C
    -
    Siemens
    Roller Plunger
    -
    2NC/1NO
    IP66, IP67
    10A
    Plastic
    400V
    -
    -
    3SE
    -
    -
    -
    -
    -
    -
    -
    -
    Honeywell
    -
    SPDT
    NO/NC
    IP66, IP67, IP68
    5A
    Die Cast Zinc
    250V
    28V
    M12
    914CE
    Snap Action
    40mm
    16mm
    44mm
    -
    +105°C
    0°C
    -
    Siemens
    Roller Plunger
    1NO/NC
    1NC/1NO
    IP66, IP67
    10A
    Plastic
    400V
    -
    -
    3SE
    -
    -
    -
    -
    -
    -
    -
    -
    Siemens
    Plunger
    -
    NO/NC
    IP65
    -
    Plastic
    -
    -
    M20
    3SE5
    -
    75.7mm
    31mm
    33mm
    -
    -
    -
    -
    Telemecanique Sensors
    Plunger
    2P
    1NO/1NC
    IP66, IP67
    -
    Plastic
    -
    -
    -
    XCMH
    -
    -
    -
    -
    -
    -
    -
    -
    Omron
    Short Hinge Roller Lever
    SPDT
    NO/NC
    IP62
    15A
    Plastic
    250V ac
    -
    -
    Z
    -
    -
    -
    -
    -
    -
    -
    -
    Eaton
    Roller Lever
    -
    1NO/1NC
    IP66, IP67
    4A
    Plastic
    400V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Siemens
    Lever
    -
    1NC/1NO
    IP66, IP67
    10A
    -
    400V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    Crouzet
    Roller Plunger
    SP
    NO/NC
    IP56
    5A
    -
    250V
    -
    Cable
    -
    -
    49.5mm
    49mm
    22mm
    -
    +70°C
    -5°C
    -
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