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. 240-2521
Mfr. Part No.GLAC07A2B
BrandHoneywell
SGD185.96
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. 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. 776-8510
Mfr. Part No.Z-15GD-B
BrandOmron
SGD19.01
Each
units
Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 30.7mm
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. 757-9231
Mfr. Part No.D4NS-1BF
BrandOmron
SGD93.03
Each
units
- - 2NC IP67 10 A Plastic 240V 250V Screw - D4NS - 96mm 31mm
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. 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. 386-0417
Mfr. Part No.Z-15GW22B
BrandOmron
SGD20.15
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 274-7997
Mfr. Part No.GHG2632301R0007
BrandCEAG
SGD945.27
Each
units
- DP NO/NC - - Polyamide - - Screw - - - 102mm 84mm
RS Stock No. 691-7257
Mfr. Part No.LSA1A
BrandHoneywell
SGD192.14
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. 235-953
Mfr. Part No.XCKJ10541
SGD146.50
Each
units
Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
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. 308-1664
Mfr. Part No.GLCB01A2A
BrandHoneywell
SGD71.73
Each
units
Adjustable Roller Lever 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. 386-0366
Mfr. Part No.Z-15GQ22B
BrandOmron
SGD32.77
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 808-2990
Mfr. Part No.LSM2D
BrandHoneywell
SGD269.84
Each
units
Rotary Lever DPDT 2NO/2NC IP65, IP66, IP67 10 A Die Cast Zinc 600V 250V 3/4 in NPT Conduit Snap Action HDLS Plug In 47.8mm 45.3mm
RS Stock No. 274-7981
Mfr. Part No.GHG2622301R0007
BrandCEAG
SGD661.07
Each
units
- DP NO/NC - - Polyamide - - Screw - - - 102mm 84mm
RS Stock No. 423-5301
Mfr. Part No.Z-15HW24B
BrandOmron
SGD19.32
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 29mm 49.2mm
RS Stock No. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
SGD182.42
Each
units
Plunger DP NO/NC - - Metal - - Screw - GSS - 141mm 42mm
RS Stock No. 396-2535
Mfr. Part No.GXA51B
BrandHoneywell
SGD329.31
Each
units
Plunger SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm