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. 179-7568
BrandRS PRO
SGD24.52
Each
units
Plunger - NO/NC IP67 - Glass Fibre Reinforced Plastic - - - - - - 31mm 31mm
RS Stock No. 902-6880
BrandRS PRO
SGD27.72
Each
units
Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 230.5mm
RS Stock No. 902-6925
BrandRS PRO
SGD39.92
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. 902-6903
BrandRS PRO
SGD29.72
Each
units
Coil Spring DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 172mm
RS Stock No. 153-3961
BrandRS PRO
SGD37.92
Each
units
Plunger DPST NO/NC IP65 10 A Plastic 400V 250V M12 Snap Action - Screw 30.3mm 30mm
RS Stock No. 902-6922
BrandRS PRO
SGD28.54
Each
units
Plunger DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 75mm
RS Stock No. 179-7561
BrandRS PRO
SGD36.33
Each
units
- - 2NC/NO IP67 - Plastic - - Screw - - - 31mm 31mm
RS Stock No. 902-6907
BrandRS PRO
SGD41.00
Each
units
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 186mm
RS Stock No. 153-3968
BrandRS PRO
SGD46.91
Each
units
Roller Plunger DPST NO/NC IP66 10 A Metal 400V 250V M12 Snap Action - Screw 30.3mm 32.5mm
RS Stock No. 902-6887
BrandRS PRO
SGD31.31
Each
units
Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 170.5mm
RS Stock No. 179-7562
BrandRS PRO
SGD36.33
Each
units
- - 2NC IP67 - Plastic - - Screw - - - 31mm 31mm
RS Stock No. 902-6919
BrandRS PRO
SGD27.88
Each
units
Roller Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 124mm
RS Stock No. 902-6953
BrandRS PRO
SGD39.09
Each
units
Adjustable Lever DPST NO/NC IP67 5 A Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 158mm
RS Stock No. 386-0423
Mfr. Part No.Z-15GW2BOMI
BrandOmron
SGD15.77
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 828-1027
Mfr. Part No.WL-CA12-GN
BrandOmron
SGD102.74
Each
units
Adjustable Roller Lever DPST NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
RS Stock No. 202-3847
Mfr. Part No.GHG2610005R0005
BrandCEAG
SGD501.90
Each
units
- 3P NO/2NC - - Polyamide - - Screw - - - 102mm 84mm
RS Stock No. 311-2112
Mfr. Part No.1LS244-4C
BrandHoneywell
SGD278.28
Each
units
Rotary Lever - - IP67 10 A - 480V 550V - Snap Action - 20 mm Conduit 111.4mm 40mm
RS Stock No. 360-8427
Mfr. Part No.ZCKJ1H29
SGD60.99
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 382-9343
Mfr. Part No.GXE51A1B
BrandHoneywell
SGD476.80
Each
units
Rotary Lever SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 106.5mm 65mm
RS Stock No. 240-2521
Mfr. Part No.GLAC07A2B
BrandHoneywell
SGD185.96
Each
units
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLA 20 mm Conduit 145.8mm 42mm