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 Contact Type Series Terminal Type Length Width
RS Stock No. 799-8840
BrandRS PRO
SGD510.62
Each
units
- - - IP67 - Aluminium - - M20 - - - - -
RS Stock No. 902-6856
BrandRS PRO
SGD24.33
Each
units
Roller Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 106mm
RS Stock No. 902-6874
BrandRS PRO
SGD23.28
Each
units
Roller Plunger DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 84mm
RS Stock No. 902-6893
BrandRS PRO
SGD31.47
Each
units
Roller Plunger DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 86mm
RS Stock No. 902-6865
BrandRS PRO
SGD25.50
Each
units
Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 170.5mm
RS Stock No. 902-6944
BrandRS PRO
SGD41.85
Each
units
Plunger DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 60mm
RS Stock No. 902-6913
BrandRS PRO
SGD31.16
Each
units
Roller Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 94mm
RS Stock No. 799-8844
BrandRS PRO
SGD603.38
Each
units
- - - IP67 - Aluminium - - M20 - - - - -
RS Stock No. 902-6871
BrandRS PRO
SGD23.28
Each
units
Roller Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 92mm
RS Stock No. 902-6878
BrandRS PRO
SGD28.88
Each
units
Roller Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 106mm
RS Stock No. 902-6862
BrandRS PRO
SGD19.82
Each
units
Plunger DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 73mm
RS Stock No. 902-6938
BrandRS PRO
SGD48.23
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. 153-3963
BrandRS PRO
SGD40.85
Each
units
Roller Lever DPST NO/NC IP65 10 A Plastic 400V 250V M12 Snap Action - Screw 30.3mm 30mm
RS Stock No. 153-3961
BrandRS PRO
SGD37.22
Each
units
Plunger DPST NO/NC IP65 10 A Plastic 400V 250V M12 Snap Action - Screw 30.3mm 30mm
RS Stock No. 760-5722
BrandRS PRO
SGD161.92
Each
units
- - NO/NC IP67 - Aluminium - - M20 - - Terminal Strip 112mm 88mm
RS Stock No. 902-6907
BrandRS PRO
SGD40.49
Each
units
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 186mm
RS Stock No. 153-3964
BrandRS PRO
SGD41.90
Each
units
Roller Lever DPST NO/NC IP65 10 A Plastic 400V 250V M12 Snap Action - Screw 30.3mm 45mm
RS Stock No. 902-6890
BrandRS PRO
SGD34.53
Each
units
Roller Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 108mm
RS Stock No. 153-3971
BrandRS PRO
SGD55.63
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. 902-6941
BrandRS PRO
SGD44.75
Each
units
Plunger DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 74mm