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. 386-0423
Mfr. Part No.Z-15GW2BOMI
BrandOmron
SGD22.93
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
SGD105.82
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
SGD297.29
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
SGD64.68
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
SGD512.93
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
SGD238.49
Each
units
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 311-2128
Mfr. Part No.2LS1-4CN151
BrandHoneywell
SGD220.43
Each
units
Plunger - - IP67 10 A - 480V 550V - Snap Action - - 98.6mm 40mm
RS Stock No. 757-9231
Mfr. Part No.D4NS-1BF
BrandOmron
SGD95.78
Each
units
- - 2NC IP67 10 A Plastic 240V 250V Screw - D4NS - 96mm 31mm
RS Stock No. 700-4309
Mfr. Part No.XCKJ10541H29
SGD124.41
Each
units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 776-8510
Mfr. Part No.Z-15GD-B
BrandOmron
SGD21.46
Each
units
Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 30.7mm
RS Stock No. 193-2015
Mfr. Part No.LS4C3K
BrandHoneywell
SGD245.92
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS Stock No. 539-296
Mfr. Part No.83733327
BrandCrouzet
SGD84.05
Each
units
Plunger SP NO/NC IP56 5 A - 250V - Cable - - Wire Lead 36mm 49mm
RS Stock No. 386-0417
Mfr. Part No.Z-15GW22B
BrandOmron
SGD21.16
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 193-2059
Mfr. Part No.LS4A3K-2B
BrandHoneywell
SGD256.21
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS Stock No. 691-7257
Mfr. Part No.LSA1A
BrandHoneywell
SGD201.75
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS Conduit 106.78mm 1.62in
RS Stock No. 274-7997
Mfr. Part No.GHG2632301R0007
BrandCEAG
SGD945.27
Each
units
- DP NO/NC - - Polyamide - - Screw - - - 102mm 84mm
RS Stock No. 742-8711
Mfr. Part No.XCE145
SGD47.70
Each
units
Roller Lever SP NO/NC IP65 1.5 A ac, 100 mA dc - 240V 250V - - OsiSense XC Screw 68.5mm 28mm
RS Stock No. 621-1543
Mfr. Part No.D4N-1132
BrandOmron
SGD33.29
Each
units
Roller Plunger SPDT NO/NC IP67 - - - - Screw - D4N - 83.6mm 31mm
RS Stock No. 235-953
Mfr. Part No.XCKJ10541
SGD190.45
Each
units
Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm