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. 814-8535
Mfr. Part No.9007AO2
TWD1,429.00
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Plunger SPST NO/NC IP20 15 A Plastic 600V - Cable Snap Action 9007 Screw 63.5mm 29mm
RS Stock No. 827-9217
Mfr. Part No.D4E-1F20N
BrandOmron
TWD3,467.00
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Plunger SPDT NO/NC IP67 5 A - 250V 250V Screw Snap Action - Screw 57mm 32.9mm
RS Stock No. 828-1020
Mfr. Part No.WL-CL-GN
BrandOmron
TWD3,838.00
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Adjustable Lever DPDT 1NO/2NC IP67 2 A Aluminium Alloy 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
RS Stock No. 902-6865
BrandRS PRO
TWD574.00
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Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 170.5mm
RS Stock No. 700-4169
Mfr. Part No.XCKP2106G11
TWD980.00
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Coil Spring DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 125-8467
Mfr. Part No.XCKVR54D1H29
TWD4,749.00
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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. 821-0242
Mfr. Part No.51ML1
BrandHoneywell
TWD18,325.00
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Roller Lever SPDT - - 20 A - 120 V, 240 V, 480 V, 600 V 115 V, 230 V 1/2 in 14 NPT - - Conduit 153.92mm 2.12in
RS Stock No. 847-4982
Mfr. Part No.LS-S02-ZB
BrandEaton
TWD4,444.00
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Key - 2NC IP65 3 A @ 24 V dc, 10 A @ 24 V ac - 415V 220V Cable Standard Action - Screw 60mm 173mm
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Mfr. Part No.ZCKL1
TWD1,691.00
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- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 72mm 30mm
RS Stock No. 808-6800
Mfr. Part No.1LS19
BrandHoneywell
TWD4,911.00
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Rotary Lever SPDT NO/NC - 10 A Die Cast Zinc 120 V, 240 V, 480 V - 1/2 in NPT Conduit Snap Action - Wire Lead 102.9mm 30.2mm
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Mfr. Part No.ZCMD25
TWD1,275.00
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- DP NO/NC IP66, IP67 1.5 A Zinc Alloy 240V 250V - Slow Action OsiSense XC Plug 50mm 30mm
RS Stock No. 814-7854
Mfr. Part No.XCKD2106N12
TWD1,664.00
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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. 360-8708
Mfr. Part No.XESP2021
TWD1,048.00
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- - 2NO/2NC - 10 A - 600V - - Snap Action OsiSense XC Screw - -
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Mfr. Part No.WLD2-G
BrandOmron
TWD2,112.00
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Roller Lever SPDT NO/NC IP67 10 A @ 250 V ac Die Cast Aluminium 600V 250V Snap-On Snap Action WL Conduit 96.7mm 40mm
RS Stock No. 235-931
Mfr. Part No.XCKJ167H29
TWD1,958.00
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Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 776-8573
Mfr. Part No.Z15HW78
BrandOmron
TWD521.00
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Lever SPDT NO/NC IP00 15 A Thermosetting Resin 250V 250V Solder Snap Action - PCB Pin 49.2mm 32.4mm
RS Stock No. 382-1119
Mfr. Part No.ATB11-2
BrandEaton
TWD920.00
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- - NO/NC IP65 10 A - 500V 220V - Snap Action - - 59.2mm 30mm
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
TWD1,261.00
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Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
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Mfr. Part No.83118007
BrandCrouzet
TWD1,484.00
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Lever SP NO/NC - 17.5 A Plastic 250V - Screw - - - 29.4mm 43mm
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Mfr. Part No.GLEB01A4J
BrandHoneywell
TWD2,173.00
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Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 60mm 65mm