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    Limit Switches

    Limit switches are contact proximity sensor devices that consist 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 that 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 on RS Malaysia are available with a wide range of actuator types and are offered at pocket-friendly prices. The type of actuator used can be determined by the mounting position, the force required, and the 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 or door movements are present or 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 and consists of two roller levers. One roller will trip the limit switch, and when the second is moved in the opposite direction, it will reset the switch.

    Door limit switch

    A common application of such limit switches is when they act as sensors that allow for precise control and monitoring of door operations. Such limit switches typically feature a lever, knob, and plunger mechanism. When an object makes contact with the switch, it triggers the actuator to move, establishing or interrupting an electrical connection to control the opening or closing of doors.

    What are the applications of limit switches?

    Other applications include using limit switches to count items or materials. For instance, on an assembly line, a limit switch can activate its actuator to move an item away when it senses that the correct number of components has been added. Limit switches can also function as safety interlocks to halt machine parts from moving past a certain point to avoid malfunctions and enhance operational safety.

    What are the advantages of limit switches?

    Limit switches are often favoured across various industrial environments for their straightforward and rugged construction, which is reliable and supports easy installation. Notably, these limit switches function well with low power consumption and can manage high-inductance loads. With robust electrical contacts, they can also handle higher current levels directly without requiring secondary relay control. This combination of features makes them handy tools for electricians.

    2317 Products showing for Limit Switches

    • RS Stock No. 223-8165
    • Mfr. Part No. G13-01-1555
    Each
    MYR4,616.38
    TE Connectivity
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS Stock No. 768-6370
    • Mfr. Part No. 3SE5242-0MC05
    Each
    MYR221.40
    Siemens
    Round Plunger
    -
    2NC/1NO
    -
    -
    Plastic
    -
    -
    M20
    3SE5
    -
    50mm
    33mm
    53mm
    -
    -
    -
    -
    Each
    MYR176.94
    Siemens
    Round Plunger
    -
    1NC/1NO
    IP40
    4A
    Plastic
    400V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    Each
    MYR468.73
    Siemens
    Roller
    -
    1NC/1NO
    IP66, IP67
    4A
    Metal
    400V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    • RS Stock No. 221-2046
    • Mfr. Part No. ZC2JD29
    Each
    MYR503.20
    Telemecanique Sensors
    -
    -
    -
    IP65
    -
    Metal
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Each
    MYR593.27
    Telemecanique Sensors
    -
    SP
    1CO
    IP65
    10A
    Metal
    240V
    -
    -
    -
    Snap Action
    -
    -
    -
    -
    -
    -
    -
    Each
    MYR212.51
    Siemens
    Roller
    -
    1NC/1NO
    IP65
    4A
    Plastic
    400V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    • RS Stock No. 755-7904
    • Mfr. Part No. 3SE5423-0CD21-1EA2
    Each
    MYR560.42
    Siemens
    Roller Plunger
    DPST
    NO/NC
    -
    -
    -
    -
    -
    Cable
    3SE5
    -
    50mm
    40mm
    16mm
    -
    -
    -
    -
    Each
    MYR733.82
    Siemens
    -
    3P
    2NC/1NO
    IP66, IP67
    10A
    Metal
    250V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    Each
    MYR272.94
    Siemens
    Roller Plunger
    -
    1NC/1NO
    IP66, IP67
    4A
    Metal
    400V
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    Each
    MYR469.02
    Honeywell
    Plunger
    DPDT
    2NO/2NC
    IP67
    10mA
    Plastic
    -
    0.03V
    Cable
    NGC
    Positive Break, Snap Action
    30mm
    16.7mm
    60.6mm
    -
    +70°C
    +25°C
    -
    • RS Stock No. 755-7884
    • Mfr. Part No. 3SE5413-0CN20-1EA5
    Each
    MYR647.82
    Siemens
    Roller Lever
    DPST
    NO/NC
    -
    -
    -
    -
    -
    Cable
    3SE5
    -
    50mm
    30mm
    16.2mm
    -
    -
    -
    -
    • RS Stock No. 768-6336
    • Mfr. Part No. 3SE5132-0CA00
    Each
    MYR186.28
    Siemens
    Round Plunger
    -
    NO/NC
    -
    -
    Plastic
    -
    -
    M20
    3SE5
    -
    40.5mm
    37.3mm
    78mm
    -
    -
    -
    -
    • RS Stock No. 272-0101
    • Mfr. Part No. 3SE51320LA001CA0
    Each
    MYR223.60
    Siemens
    -
    3P
    2NC/1NO
    IP66, IP67
    -
    Plastic
    -
    -
    -
    3SE5
    -
    -
    -
    -
    -
    -
    -
    -
    Each
    MYR270.46
    Telemecanique Sensors
    Roller Lever
    DPST
    NO/NC
    IP66, IP67
    10A
    Plastic
    240V
    -
    1/2 in NPT
    OsiSense XC
    Snap Action
    51mm
    58mm
    30mm
    -
    +70°C
    -25°C
    -
    Each
    MYR357.22
    Telemecanique Sensors
    Roller
    -
    1NC/1NO
    IP66, IP67
    10A
    Plastic
    -
    -
    -
    -
    Snap Action
    -
    -
    -
    -
    -
    -
    -
    Each (In a Pack of 20)
    MYR182.21
    Omron
    Short Hinge Roller Lever
    SPDT
    NO/NC
    IP62
    15A
    Plastic
    250V ac
    -
    -
    Z
    -
    -
    -
    -
    -
    -
    -
    -
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