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.

...
Read more Read less

Filters

Viewing 1 - 20 of 222 products
Results per page
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. 684-2908
Mfr. Part No.3SE5112-0CH01
BrandSiemens
£39.31
Each
Units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On - Snap Action Screw 119.5mm 37.3mm
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
£40.78
Each
Units
Plunger DPST NO/NC IP66, IP67 - Metal - - Screw 3SE5 - - 85.7mm 40.5mm
RS Stock No. 684-2910
Mfr. Part No.3SE5112-0CE01
BrandSiemens
£35.01
Each
Units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On - Snap Action Screw 119mm 37.3mm
RS Stock No. 749-7593
Mfr. Part No.3SE5112-0CR01
BrandSiemens
£34.76
Each
Units
Spring Rod DPST NO/NC IP66, IP67 - Metal - - Screw 3SE5 - - 85.7mm 40.5mm
RS Stock No. 749-7669
Mfr. Part No.3SE5232-0HE10
BrandSiemens
£21.01
Each
Units
Roller Lever DPST NO/NC IP65 - Plastic - - Screw 3SE5 - - 75.7mm 31mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
£41.58
Each
Units
Twist Lever DPST NO/NC IP66, IP67 - Metal - - Screw 3SE5 - - 85.7mm 40.5mm
RS Stock No. 749-7666
Mfr. Part No.3SE5232-0HK21
BrandSiemens
£21.62
Each
Units
Twist Lever DPST NO/NC IP65 - Plastic - - Screw 3SE5 - - 75.7mm 31mm
RS Stock No. 411-3021
Mfr. Part No.3SE2243-0XX40
BrandSiemens
£30.28
Each
Units
- - NO/NC IP65 - Fibreglass - - Screw 3SE5 - - 90mm 52mm
RS Stock No. 749-7580
Mfr. Part No.3SE5112-0CC02
BrandSiemens
£36.61
Each
Units
Plunger DPST NO/NC IP66, IP67 - Metal - - Screw 3SE5 - - 85.7mm 40.5mm
RS Stock No. 749-7596
Mfr. Part No.3SE5112-0CF01
BrandSiemens
£35.01
Each
Units
Roller Lever DPST NO/NC IP66, IP67 - Metal - - Screw 3SE5 - - 85.7mm 40.5mm
RS Stock No. 749-7697
Mfr. Part No.3SE5250-0CC05
BrandSiemens
£15.05
Each
Units
Plunger DPST NO/NC IP20 - Plastic - - Screw 3SE5 - - 42.5mm 30mm
RS Stock No. 749-7571
Mfr. Part No.3SE5112-0CB01
BrandSiemens
£27.58
Each
Units
Plunger DPST NO/NC IP66, IP67 - Metal - - Screw 3SE5 - - 85.7mm 40.5mm
RS Stock No. 749-7678
Mfr. Part No.3SE5232-0HR01
BrandSiemens
£26.96
Each
Units
Spring Rod DPST NO/NC IP65 - Plastic - - Screw 3SE5 - - 75.7mm 31mm
RS Stock No. 755-7865
Mfr. Part No.3SE5413-0CD20-1EA2
BrandSiemens
£36.42
Each
Units
Roller Plunger DPST NO/NC - - - - - Cable 3SE5 - - 50mm 30mm
RS Stock No. 749-7650
Mfr. Part No.3SE5232-0HD03
BrandSiemens
£18.36
Each
Units
Roller Plunger DPST NO/NC IP65 - Plastic - - Screw 3SE5 - - 75.7mm 31mm
RS Stock No. 749-7662
Mfr. Part No.3SE5232-0HF10
BrandSiemens
£21.01
Each
Units
Roller Lever DPST NO/NC IP65 - Plastic - - Screw 3SE5 - - 75.7mm 31mm
RS Stock No. 498-965
Mfr. Part No.3SE5232-0CC05
BrandSiemens
£14.31
Each
Units
Plunger - NO/NC IP65 - Plastic - - Screw 3SE5 - - 75.7mm 31mm
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
£35.01
Each
Units
Roller Lever DPST NO/NC IP66, IP67 - Metal - - Screw 3SE5 - - 85.7mm 56mm
RS Stock No. 227-977
Mfr. Part No.3SE5232-0HC05
BrandSiemens
£14.31
Each
Units
Plunger - NO/NC IP65 - Plastic - - Screw 3SE5 - - 75.7mm 31mm
RS Stock No. 228-087
Mfr. Part No.3SE5242-0HC05
BrandSiemens
£18.30
Each
Units
Plunger - NO/NC IP66, IP67 - Plastic - - Screw 3SE5 - - 60.7mm 55.5mm