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. 179-7567
BrandRS PRO
£14.33
Each
Units
Roller Plunger - NO/NC IP67 - Glass Fibre Reinforced Plastic - - - - - - 31mm 30.5mm
RS Stock No. 153-3970
BrandRS PRO
£29.68
Each
Units
Roller Lever DPST NO/NC IP66 10 A Metal 400V 250V M12 - Snap Action Screw 30.3mm 46mm
RS Stock No. 153-3968
BrandRS PRO
£27.40
Each
Units
Roller Plunger DPST NO/NC IP66 10 A Metal 400V 250V M12 - Snap Action Screw 30.3mm 32.5mm
RS Stock No. 153-3966
BrandRS PRO
£24.25
Each
Units
Spring Multidirectional Actuator DPST NO/NC IP65 10 A Plastic 400V 250V M12 - Snap Action Screw 30.3mm 30mm
RS Stock No. 153-3964
BrandRS PRO
£21.54
Each
Units
Roller Lever DPST NO/NC IP65 10 A Plastic 400V 250V M12 - Snap Action Screw 30.3mm 45mm
RS Stock No. 153-3962
BrandRS PRO
£20.99
Each
Units
Roller Plunger DPST NO/NC IP65 10 A Plastic 400V 250V M12 - Snap Action Screw 30.3mm 30mm
RS Stock No. 179-7566
BrandRS PRO
£19.10
Each
Units
Roller Arm Lever - NO/NC IP67 - Glass Fibre Reinforced Plastic - - - - - - 31mm 31mm
RS Stock No. 179-7565
BrandRS PRO
£19.10
Each
Units
Cat Whisker - NO/NC IP67 - Glass Fibre Reinforced Plastic - - - - - - 31mm 31mm
RS Stock No. 179-7570
BrandRS PRO
£15.91
Each
Units
Roller Lever - NO/NC IP67 - Glass Fibre Reinforced Plastic - - - - - - 31mm 47.5mm
RS Stock No. 179-7569
BrandRS PRO
£15.91
Each
Units
Roller Lever - NO/NC IP67 - Glass Fibre Reinforced Plastic - - - - - - 31mm 45mm
RS Stock No. 179-7563
BrandRS PRO
£21.22
Each
Units
- - NO/NC IP67 - Plastic - - Screw - - - 31mm 31mm
RS Stock No. 179-7568
BrandRS PRO
£14.33
Each
Units
Plunger - NO/NC IP67 - Glass Fibre Reinforced Plastic - - - - - - 31mm 31mm
RS Stock No. 153-3971
BrandRS PRO
£28.59
Each
Units
Spring Multidirectional Actuator DPST NO/NC IP66 10 A Metal 400V 250V M12 - Snap Action Screw 30.3mm 32.5mm
RS Stock No. 308-1664
Mfr. Part No.GLCB01A2A
BrandHoneywell
£36.34
Each
Units
Adjustable Roller 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
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
£22.54
Each
Units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - OsiSense XC Snap Action Screw 65mm 31mm
RS Stock No. 386-0423
Mfr. Part No.Z-15GW2BOMI
BrandOmron
£7.64
Each
Units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - - Snap Action Screw 39.4mm 49.2mm
RS Stock No. 447-3575
Mfr. Part No.ZCP21
£10.87
Each
Units
- DP NO/NC - 1.5 A Plastic 240V 250V - OsiSense XC Snap Action Screw 65mm 31mm
RS Stock No. 498-5567
Mfr. Part No.440P-MTAS11B
£34.20
Each
Units
Telescope Arm - NO/NC - - Metal - - - 440P - - 71mm 40mm
RS Stock No. 308-1816
Mfr. Part No.GLCB01C
BrandHoneywell
£38.44
Each
Units
Roller Plunger 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