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. 539-343
Mfr. Part No.83871101
BrandCrouzet
£45.48
Each
Units
Plunger - NO/NC IP66, IP67 6 A Metal 240V 125V Cable - Snap Action - 69.9mm 30mm
RS Stock No. 539-296
Mfr. Part No.83733327
BrandCrouzet
£41.70
Each
Units
Plunger SP NO/NC IP56 5 A - 250V - Cable - - Wire Lead 36mm 49mm
RS Stock No. 539-319
Mfr. Part No.83106022
BrandCrouzet
£13.65
Each
Units
Plunger SPDT NO/NC - 17.5 A Polyamide 250V - - - - Quick Connect 19mm 32mm
RS Stock No. 539-208
Mfr. Part No.83732329
BrandCrouzet
£51.17
Each
Units
Roller Plunger SP NO/NC IP56 5 A - 250V - Cable - - Wire Lead 49.5mm 49mm
RS Stock No. 539-218
Mfr. Part No.83873101
BrandCrouzet
£47.39
Each
Units
Lever - NO/NC IP66, IP67 6 A Metal 240V 125V Cable - Snap Action - 76.6mm 30mm
RS Stock No. 539-303
Mfr. Part No.83872101
BrandCrouzet
£54.97
Each
Units
Plunger - NO/NC IP66, IP67 6 A Metal 240V 125V Cable - Snap Action - 85mm 30mm
RS Stock No. 539-236
Mfr. Part No.83139103
BrandCrouzet
£33.17
Each
Units
Plunger SPDT - - - - - - - - - Wire Lead - -
RS Stock No. 539-270
Mfr. Part No.83873301
BrandCrouzet
£42.60
Each
Units
Lever - NO/NC IP66, IP67 100 mA Metal 30V 30V Cable - Snap Action - 85.6mm 30mm
RS Stock No. 323-9302
Mfr. Part No.83841701
BrandCrouzet
£80.55
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 539-230
Mfr. Part No.83118007
BrandCrouzet
£33.17
Each
Units
Lever SP NO/NC - 17.5 A Plastic 250V - Screw - - - 29.4mm 43mm
RS Stock No. 539-315
Mfr. Part No.83731324
BrandCrouzet
£47.39
Each
Units
Plunger SP NO/NC IP66 5 A - 250V - Cable - - Wire Lead 49.5mm 49mm
RS Stock No. 174-6189
Mfr. Part No.83-733-327
BrandCrouzet
£50.26
Each
Units
Plunger SP NO/NC IP56 5 A Metal 250V - Cable - Single Break - 46.5mm 22mm
RS Stock No. 539-353
Mfr. Part No.83871301
BrandCrouzet
£59.70
Each
Units
Plunger - NO/NC IP66, IP67 100 mA Metal 30V 30V Cable - Snap Action - 49mm 30mm
RS Stock No. 323-9295
Mfr. Part No.83840701
BrandCrouzet
£71.07
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 539-264
Mfr. Part No.83589801
BrandCrouzet
£36.96
Each
Units
Plunger SP NO/NC IP66, IP67 5 A Thermoplastic 250V 24V - - - - 70mm 25mm
RS Stock No. 323-9239
Mfr. Part No.83 581 001
BrandCrouzet
£27.48
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 539-286
Mfr. Part No.83870101
BrandCrouzet
£42.64
Each
Units
Plunger - NO/NC IP66, IP67 6 A Metal 240V 125V Cable - Snap Action - 69.9mm 30mm
RS Stock No. 539-214
Mfr. Part No.83874101
BrandCrouzet
£52.12
Each
Units
Plunger - NO/NC IP66, IP67 6 A Metal 240V 125V Cable - Snap Action - 74.8mm 30mm
RS Stock No. 323-9324
Mfr. Part No.83845701
BrandCrouzet
£118.46
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 539-258
Mfr. Part No.83229001
BrandCrouzet
£33.17
Each
Units
Plunger SP NO/NC - 10 A Polyamide 250V - Solder Pin - - - 13.15mm -