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 21 - 40 of 1121 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. 902-6953
BrandRS PRO
£21.60
Each
Units
Adjustable Lever DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable - Snap Wire Lead 31.5mm 158mm
RS Stock No. 902-6944
BrandRS PRO
£20.35
Each
Units
Plunger DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable - Snap Wire Lead 31.5mm 60mm
RS Stock No. 902-6887
BrandRS PRO
£14.60
Each
Units
Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable - Snap Screw 30.3mm 170.5mm
RS Stock No. 902-6907
BrandRS PRO
£19.69
Each
Units
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable - Snap Screw 30.3mm 186mm
RS Stock No. 902-6919
BrandRS PRO
£14.88
Each
Units
Roller Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable - Snap Screw 30.3mm 124mm
RS Stock No. 902-6947
BrandRS PRO
£23.39
Each
Units
Roller Plunger DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable - Snap Wire Lead 31.5mm 70mm
RS Stock No. 902-6922
BrandRS PRO
£15.77
Each
Units
Plunger DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable - Snap Screw 30.3mm 75mm
RS Stock No. 902-6903
BrandRS PRO
£16.42
Each
Units
Coil Spring DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable - Snap Screw 30.3mm 172mm
RS Stock No. 902-6916
BrandRS PRO
£19.09
Each
Units
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable - Snap Screw 30.3mm 232.5mm
RS Stock No. 902-6941
BrandRS PRO
£21.76
Each
Units
Plunger DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable - Snap Wire Lead 31.5mm 74mm
RS Stock No. 902-6925
BrandRS PRO
£22.06
Each
Units
Plunger DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable - Snap Wire Lead 31.5mm 60mm
RS Stock No. 902-6935
BrandRS PRO
£23.31
Each
Units
Adjustable Lever DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable - Snap Wire Lead 31.5mm 158mm
RS Stock No. 902-6938
BrandRS PRO
£23.45
Each
Units
Plunger DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable - Snap Wire Lead 31.5mm 74mm
RS Stock No. 153-3966
BrandRS PRO
£22.85
Each
Units
Spring Multidirectional Actuator DPST NO/NC IP65 10 A Plastic 400V 250V M12 - Snap Action Screw 30.3mm 30mm
RS Stock No. 153-3967
BrandRS PRO
£24.14
Each
Units
Plunger DPST NO/NC IP66 10 A Metal 400V 250V M12 - Snap Action Screw 30.3mm 32.5mm
RS Stock No. 153-3964
BrandRS PRO
£20.30
Each
Units
Roller Lever DPST NO/NC IP65 10 A Plastic 400V 250V M12 - Snap Action Screw 30.3mm 45mm
RS Stock No. 153-3968
BrandRS PRO
£25.83
Each
Units
Roller Plunger DPST NO/NC IP66 10 A Metal 400V 250V M12 - Snap Action Screw 30.3mm 32.5mm
RS Stock No. 153-3965
BrandRS PRO
£20.91
Each
Units
Roller Lever DPST NO/NC IP65 10 A Plastic 400V 250V M12 - Snap Action Screw 30.3mm 46mm
RS Stock No. 153-3963
BrandRS PRO
£19.79
Each
Units
Roller Lever DPST NO/NC IP65 10 A Plastic 400V 250V M12 - Snap Action Screw 30.3mm 30mm
RS Stock No. 153-3971
BrandRS PRO
£26.95
Each
Units
Spring Multidirectional Actuator DPST NO/NC IP66 10 A Metal 400V 250V M12 - Snap Action Screw 30.3mm 32.5mm
Related Products
Lovato electric KB series limit switches have been ...
Description:
Lovato electric KB series limit switches have been designed to meet safety requirements whilst also providing easy wiring, simple setup, modularity and constant reliability.The innovative locking bayonet mechanism allows tool free removal and repositioning of the operating head. Actuator heads have axial rotation of 180°. Self-extinguishing double insulation polymer thermoplasticM20 ...
Telemecanique OsiSense XCKW series wireless and battery-less limit ...
Description:
Telemecanique OsiSense XCKW series wireless and battery-less limit switches. The XCKW range provides simplified machine communication where wiring or wire maintenance is not physically or economically possible. The XCKW series limit switches are compatible with various receivers from Telemecanique that offer several output options. Limit switch can be re-orienatatedBattery-less operationReduced ...
Explosion proof limit switches designed specifically for use ...
Description:
Explosion proof limit switches designed specifically for use in hazardous location applications. The enclosure is sealed for protection against water, corrosion, dust and oil. Ideal for outdoor use and adverse environmentsRemovable circular cover for access to switching elements and wiringRated at 10A continuousProtected to IP67.
General description (applications): on the basis of increasing ...
Description:
General description (applications): on the basis of increasing requirements in relation to the safety of technical devices and machinery, electromechanical pin switches are becoming increasingly indispensable. These include safety pin switches enclosed in moulding material in compliance with EN 50047 (and other standards) and metal-encapsulated position switches in compliance with ...