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. 609-3430
Mfr. Part No.ZC2JC1
HK$555.74
Each
units
- SP NO/NC IP65 10 A Metal 240V - - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 908-3281
Mfr. Part No.WLD18-Y-N
BrandOmron
HK$415.37
Each
units
Plunger SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 42mm
RS Stock No. 311-2112
Mfr. Part No.1LS244-4C
BrandHoneywell
HK$1,441.12
Each
units
Rotary Lever - - IP67 10 A - 480V 550V - Snap Action - 20 mm Conduit 111.4mm 40mm
RS Stock No. 814-7854
Mfr. Part No.XCKD2106N12
HK$527.85
Each
units
Coil Spring DPST NO/NC IP66, IP67 10 A Zamak® Zinc Alloy 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 65mm 31mm
RS Stock No. 814-7835
Mfr. Part No.XCKP2145M12
HK$590.34
Each
units
Roller Lever DPST NO/NC IP66, IP67 3 A Plastic 250V - M12 Snap Action OsiSense XC 4 Pin 65mm 31mm
RS Stock No. 447-3402
Mfr. Part No.XCKP2102P16
HK$227.44
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 308-1838
Mfr. Part No.GLCB01E7B
BrandHoneywell
HK$400.00
Each
units
Coil Spring SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 753-0012
Mfr. Part No.D4E-1A20N
BrandOmron
HK$403.94
Each
units
Roller Plunger SPDT NO/NC IP67 5 A - 125V - Screw Snap Action - Screw 57mm 32.9mm
RS Stock No. 386-0372
Mfr. Part No.Z15GQB
BrandOmron
HK$107.06
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 47.3mm 49.2mm
RS Stock No. 418-6079
Mfr. Part No.XCKS159
HK$337.34
Each
units
Lever DP NO/NC IP65 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm
RS Stock No. 609-6647
Mfr. Part No.XCRA11
HK$1,767.97
Each
units
Lever DP NO/NC IP54 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS Stock No. 186-8201
Mfr. Part No.GLAC01A1B
BrandHoneywell
HK$742.88
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 908-3269
Mfr. Part No.WLCA12-2NG-N
BrandOmron
HK$708.95
Each
units
Roller Lever SPST NO/NC IP67 10 A - 500V 250V PG 13.5 Snap Action WL Screw 40mm 53.2mm
RS Stock No. 814-7839
Mfr. Part No.XCKP2145N12
HK$513.63
Each
units
Roller Lever DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 65mm 31mm
RS Stock No. 447-3430
Mfr. Part No.XCKP2121P16
HK$234.79
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V Cable Snap Action OsiSense XC Screw Clamp 65mm 31mm
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
HK$289.52
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 447-3878
Mfr. Part No.XCMD2115L1
HK$352.52
Each
units
Lever DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 470-4396
Mfr. Part No.TV1H 236-11z
BrandSchmersal
HK$318.00
Each
units
Lever DPDT NO/NC IP67 4 A Thermoplastic 230V 24V - Slow Action - Screw 58.5mm 30mm
RS Stock No. 382-9359
Mfr. Part No.GXE51B
BrandHoneywell
HK$1,533.79
Each
units
Plunger SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 88mm 52mm
RS Stock No. 186-8481
Mfr. Part No.GLEB01E7B
BrandHoneywell
HK$511.68
Each
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Coil Spring SPDT NO/NC IP66 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 189mm 65mm
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