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

    Roller Plunger
    DPST
    NO/NC
    IP67
    5A
    Thermoplastic
    240V
    250V
    Cable
    -
    Snap Action
    31.5mm
    70mm
    16mm
    -
    +70°C
    -25°C
    -
    Coil Spring
    DPST
    NO/NC
    IP65
    10A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    170mm
    30mm
    -
    +70°C
    -25°C
    -
    Lever
    SPDT
    1NC/1NO
    IP67
    10A
    Die Cast Zinc
    600V ac
    -
    M20
    -
    Snap Action
    -
    -
    -
    -
    -
    -
    -
    Roller Lever
    DPST
    NO/NC
    IP66
    10A
    Metal
    400V
    250V
    M12
    -
    Snap Action
    30.3mm
    46mm
    172mm
    -
    +70°C
    -25°C
    -
    Roller Lever
    DPST
    NO/NC
    IP67
    5A
    Die Cast Zinc
    240V
    250V
    Cable
    -
    Snap Action
    31.5mm
    92mm
    16mm
    -
    +70°C
    -25°C
    -
    Roller Lever
    DPST
    NO/NC
    IP67
    5A
    Thermoplastic
    240V
    250V
    Cable
    -
    Snap Action
    31.5mm
    92mm
    16mm
    -
    +70°C
    -25°C
    -
    -
    -
    NO/NC
    IP67
    -
    Aluminium
    -
    -
    M20
    -
    -
    112mm
    88mm
    93mm
    -
    +80°C
    -20°C
    -
    Adjustable Roller Lever
    -
    1NO/1NC
    IP65
    10A
    Thermoplastic
    400V
    250V
    -
    -
    Snap Action
    191mm
    41mm
    61.5mm
    -
    +70°C
    -25°C
    -
    Rotary
    SPDT
    1NC/1NO
    IP67
    3A
    Zinc Alloy
    240V ac
    -
    1m Cable
    -
    Snap Action
    -
    40mm
    34.7
    -
    +85°C
    -25°C
    -
    Roller Plunger
    SPDT
    2NO/2NC
    IP67
    10A
    Die Cast Zinc
    600V ac
    -
    M20
    -
    Snap Action
    -
    -
    -
    -
    +80°C
    -25°C
    -
    Roller Lever
    SPDT
    1NC/1NO
    IP67
    10A
    Die Cast Zinc
    600V ac
    -
    M20
    -
    Snap Action
    -
    64mm
    30.8mm
    -
    +80°C
    -25°C
    -
    Roller Lever
    SPDT
    1NC/1NO
    IP67
    10A
    Die Cast Aluminium
    600V ac
    -
    M20
    -
    Snap Action
    -
    -
    -
    -
    +80°C
    -25°C
    -
    Coil Spring
    SPDT 1NO/1NC
    1NO/1NC
    IP67
    3A
    Die Cast Zinc
    250V ac
    -
    PG13.5
    -
    Snap Action
    -
    -
    -
    -
    +80°C
    -25°C
    -
    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
    -
    Roller Plunger
    SPDT
    1NC/1NO
    IP67
    5A
    Metal
    250V ac
    -
    Screw
    -
    -
    45.4mm
    18mm
    -
    -
    +80°C
    -30°C
    -
    Roller Lever
    -
    1NO/1NC
    IP67
    10A
    Thermoplastic
    400V
    250V
    -
    -
    Snap Action
    101.5mm
    31.5mm
    16mm
    -
    +70°C
    -25°C
    -
    Roller Lever
    -
    NO/NC
    IP67
    -
    Glass Reinforced Plastic (GRP)
    -
    -
    -
    -
    -
    31mm
    47.5mm
    107mm
    -
    -
    -
    -
    Roller Lever
    DPST
    NO/NC
    IP65
    4A
    Glass Fibre Reinforced Thermoplastic
    400V
    250V
    Cable
    -
    Snap Action
    30.3mm
    106mm
    30mm
    -
    +70°C
    -25°C
    -
    Spring Lever
    DPST
    NO/NC
    IP65
    10A
    Plastic
    400V
    250V
    M12
    -
    Snap Action
    30.3mm
    30mm
    174.5mm
    -
    +70°C
    -25°C
    -
    Omron
    Roller Lever
    SPDT
    NO/NC
    IP00
    15A
    -
    500V
    250V
    -
    Z
    Snap Action
    39.4mm
    49.2mm
    17.45mm
    -
    +80°C
    -25°C
    CE
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