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. 274-7981
Mfr. Part No.GHG2622301R0007
BrandCEAG
£329.89
Each
Units
- DP NO/NC - - Polyamide - - Screw - - - 102mm 84mm
RS Stock No. 334-612
Mfr. Part No.BZE7-2RN2-C
BrandHoneywell
£106.08
Each
Units
Roller Lever - - IP65 - - - - - - - Screw - -
RS Stock No. 186-8166
Mfr. Part No.GLAC20C
BrandHoneywell
£83.79
Each
Units
Plunger DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V Snap-On GLA Snap Action 20 mm Cable 82mm 42mm
RS Stock No. 360-8584
Mfr. Part No.ZCKM1
£22.49
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. 202-3847
Mfr. Part No.GHG2610005R0005
BrandCEAG
£246.77
Each
Units
- 3P NO/2NC - - Polyamide - - Screw - - - 102mm 84mm
RS Stock No. 873-2235
Mfr. Part No.440P-MSLS11B
£34.20
Each
Units
Short Lever SPST NO/NC IP66 - Metal - - M20 440P - - 133mm 40mm
RS Stock No. 908-3284
Mfr. Part No.WLNJ-G-N
BrandOmron
£40.38
Each
Units
Coil Spring SPST NO/NC IP67 10 A - 500V 250V PG 13.5 WL Snap Action Screw 40mm 42mm
RS Stock No. 246-3087
Mfr. Part No.14CE2-3
BrandHoneywell
£67.60
Each
Units
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - 14CE Snap Action Wire Lead 49mm 40mm
RS Stock No. 308-1951
Mfr. Part No.GLCB07A2B
BrandHoneywell
£46.89
Each
Units
Adjustable Roller Lever SPDT 1NO/1NC Gold Contacts NO/NC IP66 100 mA Die Cast Zinc 50V 50V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 308-1894
Mfr. Part No.GLDB01E7B
BrandHoneywell
£28.65
Each
Units
Coil Spring SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block GLD Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 447-3812
Mfr. Part No.ZCMD25
£31.00
Each
Units
- DP NO/NC IP66, IP67 1.5 A Zinc Alloy 240V 250V - OsiSense XC Slow Action Plug 50mm 30mm
RS Stock No. 700-4309
Mfr. Part No.XCKJ10541H29
£68.00
Each
Units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Screw 77mm 40mm
RS Stock No. 470-4403
Mfr. Part No.ZS 236-11Z
BrandSchmersal
£22.49
Each
Units
Plunger - NO/NC IP67 10 A Thermoplastic 230V 24V - - Snap Action Screw 61.5mm 30mm
RS Stock No. 230-1923
Mfr. Part No.XCKM110
£31.35
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
£32.00
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
£37.05
Each
Units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - OsiSense XC Snap Action Wire Lead 50mm 30mm
RS Stock No. 757-9140
Mfr. Part No.D4B4111N
BrandOmron
£45.44
Each
Units
Roller Lever DPST NO/NC - - Metal - - Screw D4B-N - - 99.5mm 40mm
RS Stock No. 186-8150
Mfr. Part No.GLAC20A1B
BrandHoneywell
£90.46
Each
Units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V - GLA Snap Action 20 mm Conduit 145.8mm 42mm
RS Stock No. 308-1844
Mfr. Part No.GLCB01A4J
BrandHoneywell
£39.20
Each
Units
Adjustable Lever SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm