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.

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Description Price Actuator Type Pole and Throw Configuration Normal State Configuration IP Rating Maximum Current Housing Material Maximum AC Voltage Maximum DC Voltage Connection Type Series Contact Type Terminal Type Length Width
RS Stock No. 447-3840
Mfr. Part No.XCMD2102L1
£45.00
Each
Units
Plunger DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Wire Lead 50mm 30mm
RS Stock No. 447-3395
Mfr. Part No.XCKP2118P16
£22.39
Each
Units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - OsiSense XC Snap Action Screw 65mm 31mm
RS Stock No. 447-3575
Mfr. Part No.ZCP21
£10.64
Each
Units
- DP NO/NC - 1.5 A Plastic 240V 250V - OsiSense XC Snap Action Screw 65mm 31mm
RS Stock No. 447-3806
Mfr. Part No.ZCMD21
£28.14
Each
Units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Plug 50mm 30mm
RS Stock No. 360-8427
Mfr. Part No.ZCKJ1H29
£32.00
Each
Units
- DP NO/NC IP65 10 A Metal 240V 250V - OsiSense XC Snap Action Screw 77mm 40mm
RS Stock No. 235-953
Mfr. Part No.XCKJ10541
£67.00
Each
Units
Lever SPDT NO/NC IP66 10 A Metal 600V 600V - OsiSense XC Snap Action Screw 77mm 40mm
RS Stock No. 360-8562
Mfr. Part No.ZCKM1H29
£23.12
Each
Units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Wire Lead 64mm 58.5mm
RS Stock No. 422-9463
Mfr. Part No.9007TUB4M11
£144.00
Each
Units
Lever SPDT NO/NC IP66 150 A Die Cast Zinc 600V 600V - 9007 Snap Action Conduit 61.98mm 59mm
RS Stock No. 244-749
Mfr. Part No.XCKJ10513H29
£73.00
Each
Units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Screw 77mm 40mm
RS Stock No. 235-931
Mfr. Part No.XCKJ167H29
£58.00
Each
Units
Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Screw 77mm 40mm
RS Stock No. 235-969
Mfr. Part No.XCKJ10559
£66.00
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 447-3604
Mfr. Part No.ZCD21
£16.28
Each
Units
- DP NO/NC - 1.5 A Metal 240V 250V - OsiSense XC Snap Action Screw 65mm 31mm
RS Stock No. 447-3452
Mfr. Part No.XCKP2145P16
£26.34
Each
Units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - OsiSense XC Snap Action Screw 65mm 31mm
RS Stock No. 360-8584
Mfr. Part No.ZCKM1
£22.02
Each
Units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Wire Lead 64mm 58.5mm
RS Stock No. 230-1872
Mfr. Part No.XCKS131
£38.00
Each
Units
Lever DP NO/NC IP65 3 A Plastic 240V 250V - OsiSense XC Snap Action Screw 72.5mm 40mm
RS Stock No. 700-4309
Mfr. Part No.XCKJ10541H29
£67.00
Each
Units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Screw 77mm 40mm
RS Stock No. 447-3812
Mfr. Part No.ZCMD25
£30.46
Each
Units
- DP NO/NC IP66, IP67 1.5 A Zinc Alloy 240V 250V - OsiSense XC Slow Action Plug 50mm 30mm
RS Stock No. 230-1923
Mfr. Part No.XCKM110
£31.05
Each
Units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Screw 64mm 63mm
RS Stock No. 360-8455
Mfr. Part No.ZCKJ1
£31.28
Each
Units
- DP NO/NC IP65 10 A Metal 240V 250V - OsiSense XC Snap Action Screw 77mm 40mm
RS Stock No. 609-3856
Mfr. Part No.ZCMD21L2
£37.00
Each
Units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Wire Lead 50mm 30mm