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. 447-3395
Mfr. Part No.XCKP2118P16
R 603.00
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS stock no. 199-080
Mfr. Part No.AZD1054CEJ
BrandPanasonic
R 256.61
Each
units
Roller Lever DPST NO/NC IP67 6 A - 380V 220V - - AZD1 Screw 77mm 30mm
RS stock no. 123-4596
Mfr. Part No.XCKW159
R 2,601.07
Each
units
Rod - - IP66, IP67 - Plastic - - - Snap Action OsiSense XC Screw 40mm 58.7mm
RS stock no. 360-8427
Mfr. Part No.ZCKJ1H29
R 800.00
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS stock no. 609-6681
Mfr. Part No.XCRT115
R 4,575.00
Each
units
Lever DP 2NO/2NC IP65 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS stock no. 207-1997
Mfr. Part No.GLBC02A2B
BrandHoneywell
R 1,710.92
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLB 20 mm Conduit 145.8mm 42mm
RS stock no. 752-8918
Mfr. Part No.XCKS141H29
BrandSquare D
R 1,026.00
Each
units
Roller Lever DPST NO/NC IP65 10 A Plastic 240V 250V Screw Clamp Snap Action OsiSense XC Screw 72.5mm 40mm
RS stock no. 235-953
Mfr. Part No.XCKJ10541
R 1,173.79
Each
units
Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS stock no. 700-4318
Mfr. Part No.XCKJ10559H29
R 1,584.00
Each
units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS stock no. 447-3430
Mfr. Part No.XCKP2121P16
R 683.00
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. 386-0366
Mfr. Part No.Z15GQ22B
BrandOmron
R 249.19
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS stock no. 335-081
Mfr. Part No.14CE3-1
BrandHoneywell
R 1,323.42
Each
units
Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS stock no. 447-3806
Mfr. Part No.ZCMD21
R 972.89
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Plug 50mm 30mm
RS stock no. 847-4998
Mfr. Part No.LS-S11-ZB
BrandEaton
R 1,878.43
Each
units
Key - NO/NC IP65 3 A @ 24 V dc, 10 A @ 24 V ac - 415V 220V Cable Standard Action - Screw 60mm 173mm
RS stock no. 246-3087
Mfr. Part No.14CE2-3
BrandHoneywell
R 1,585.86
Each
units
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS stock no. 386-0423
Mfr. Part No.Z15GW2BOMI
BrandOmron
R 150.73
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS stock no. 435-0337
Mfr. Part No.ZC-Q2155
BrandOmron
R 571.33
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS stock no. 609-6675
Mfr. Part No.XCRF17
R 4,390.00
Each
units
Lever 4P 2NO/2NC IP54 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS stock no. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
R 960.58
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS stock no. 360-8562
Mfr. Part No.ZCKM1H29
R 645.12
Each
units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 64mm 58.5mm