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. 828-1014
Mfr. Part No.WL-CA2GN
BrandOmron
MYR312.67
Each
units
Roller Lever DPDT NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 125mm 40mm
RS Stock No. 748-2897
Mfr. Part No.D4C-1202
BrandOmron
MYR430.94
Each
units
Roller Plunger SPDT NO/NC IP67 4 A dc, 5 A ac Metal 250V 30V Screw Snap Action - Screw 51.5mm 40mm
RS Stock No. 436-0205
Mfr. Part No.Z-15GW55-B
BrandOmron
MYR74.01
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 28.2mm 49.2mm
RS Stock No. 447-3575
Mfr. Part No.ZCP21
MYR69.15
Each
units
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 396-2513
Mfr. Part No.GXA51A1B
BrandHoneywell
MYR1,861.01
Each
units
Rotary Lever SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm
RS Stock No. 515-694
Mfr. Part No.BZE7-2RQ-C
BrandHoneywell
MYR526.75
Each
units
Plunger - - IP50 - - - - - - - Screw - -
RS Stock No. 314-996
Mfr. Part No.EX-AR
BrandHoneywell
MYR1,347.39
Each
units
Rotary Lever - - - 20 A - - - - - - Screw 2.7mm 2.75mm
RS Stock No. 360-8685
Mfr. Part No.XE2SP2151
MYR91.98
Each
units
- DP NO/NC - 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS Stock No. 776-8551
Mfr. Part No.Z15GW22
BrandOmron
MYR51.57
Each
units
Roller Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 39.4mm
RS Stock No. 447-3402
Mfr. Part No.XCKP2102P16
MYR169.14
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 447-3446
Mfr. Part No.XCKP2127P16
MYR193.45
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 447-3840
Mfr. Part No.XCMD2102L1
MYR303.31
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. 360-8708
Mfr. Part No.XESP2021
MYR157.05
Each
units
- - 2NO/2NC - 10 A - 600V - - Snap Action OsiSense XC Screw - -
RS Stock No. 539-218
Mfr. Part No.83873101
BrandCrouzet
MYR398.87
Each
units
Lever - NO/NC IP66, IP67 6 A Metal 240V 125V Cable Snap Action - - 76.6mm 30mm
RS Stock No. 905-5141
Mfr. Part No.BNS026R
BrandBALLUFF
MYR946.05
Each
units
Plunger 2P NO/NC IP67 6 A Aluminium 250V - M20 Snap - Screw 79mm 36mm
RS Stock No. 700-4267
Mfr. Part No.XCKP2118G11
MYR141.24
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 295-4870
Mfr. Part No.8LS1-4C
BrandHoneywell
MYR516.69
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit - -
RS Stock No. 684-2910
Mfr. Part No.3SE5112-0CE01
BrandSiemens
MYR229.78
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119mm 37.3mm
RS Stock No. 174-6189
Mfr. Part No.83-733-327
BrandCrouzet
MYR438.52
Each
units
Plunger SP NO/NC IP56 5 A Metal 250V - Cable Single Break - - 46.5mm 22mm
RS Stock No. 447-3834
Mfr. Part No.XCMD2110L1
MYR211.53
Each
units
Plunger DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm