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. 360-8427
Mfr. Part No.ZCKJ1H29
SGD66.31
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 700-4309
Mfr. Part No.XCKJ10541H29
SGD141.63
Each
units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 235-953
Mfr. Part No.XCKJ10541
SGD140.85
Each
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Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 235-925
Mfr. Part No.XCKJ161
SGD122.53
Each
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Plunger SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 360-8455
Mfr. Part No.ZCKJ1
SGD60.22
Each
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- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 125-8467
Mfr. Part No.XCKVR54D1H29
SGD207.43
Each
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Crossed Rods Lever 4P 2NC IP65 10 A PBT+PC GF30 FR, Plastic 240V 125V Screw Clamp Slow Break OsiSense XC Screw 200mm 57mm
RS Stock No. 609-6675
Mfr. Part No.XCRF17
SGD271.08
Each
units
Lever 4P 2NO/2NC IP54 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS Stock No. 447-3806
Mfr. Part No.ZCMD21
SGD44.68
Each
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- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Plug 50mm 30mm
RS Stock No. 235-931
Mfr. Part No.XCKJ167H29
SGD97.07
Each
units
Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 700-4267
Mfr. Part No.XCKP2118G11
SGD47.46
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 814-8535
Mfr. Part No.9007AO2
SGD60.69
Each
units
Plunger SPST NO/NC IP20 15 A Plastic 600V - Cable Snap Action 9007 Screw 63.5mm 29mm
RS Stock No. 235-997
Mfr. Part No.XCKM121H29
SGD90.21
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 125-8473
Mfr. Part No.XCMN2115L1
SGD50.28
Each
units
Spring Return Roller Lever DP NO/NC IP65 6 A Plastic 240V 250V Fixed Cable Snap Action OsiSense XC Fixed Cable 30mm 32.4mm
RS Stock No. 609-6530
Mfr. Part No.XCKL106
SGD103.80
Each
units
- SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 72mm 52mm
RS Stock No. 609-3430
Mfr. Part No.ZC2JC1
SGD100.96
Each
units
- SP NO/NC IP65 10 A Metal 240V - - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 230-1967
Mfr. Part No.XCKM115
SGD62.92
Each
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Lever DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 609-3755
Mfr. Part No.ZCKJ404
SGD128.23
Each
units
- DP 2NO/2NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 814-7949
Mfr. Part No.XCKJ167H7
SGD122.01
Each
units
Roller Lever DPST NO/NC IP66 10 A Zamak® Zinc Alloy 500V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 77mm 40mm
RS Stock No. 283-656
Mfr. Part No.XCMD2111L1
SGD65.72
Each
units
Plunger DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 422-9463
Mfr. Part No.9007TUB4M11
SGD289.45
Each
units
Lever SPDT NO/NC IP66 150 A Die Cast Zinc 600V 600V - Snap Action 9007 Conduit 61.98mm 59mm