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. 776-8551
Mfr. Part No.Z15GW22
BrandOmron
MYR49.38
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. 314-996
Mfr. Part No.EX-AR
BrandHoneywell
MYR1,003.72
Each
units
Rotary Lever - - - 20 A - - - - - - Screw 2.7mm 2.75mm
RS Stock No. 905-5141
Mfr. Part No.BNS026R
BrandBALLUFF
MYR1,984.82
Each
units
Plunger 2P NO/NC IP67 6 A Aluminium 250V - M20 Snap - Screw 79mm 36mm
RS Stock No. 360-8708
Mfr. Part No.XESP2021
MYR134.86
Each
units
- - 2NO/2NC - 10 A - 600V - - Snap Action OsiSense XC Screw - -
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. 436-0205
Mfr. Part No.Z-15GW55-B
BrandOmron
MYR70.86
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 28.2mm 49.2mm
RS Stock No. 447-3446
Mfr. Part No.XCKP2127P16
MYR181.08
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
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. 748-2897
Mfr. Part No.D4C-1202
BrandOmron
MYR298.59
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. 902-6900
BrandRS PRO
MYR80.92
Each
units
Plunger DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 75mm
RS Stock No. 447-3575
Mfr. Part No.ZCP21
MYR67.15
Each
units
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 447-3840
Mfr. Part No.XCMD2102L1
MYR278.56
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. 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. 776-8560
Mfr. Part No.Z-15GW-B
BrandOmron
MYR56.34
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 822-5620
Mfr. Part No.Z-15HW24-B7-K
BrandOmron
MYR61.99
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V M4 Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 609-6675
Mfr. Part No.XCRF17
MYR958.42
Each
units
Lever 4P 2NO/2NC IP54 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS Stock No. 308-272
Mfr. Part No.LS-11S
BrandEaton
MYR97.49
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 323-9239
Mfr. Part No.83 581 001
BrandCrouzet
MYR214.55
Each
units
- - - - - - - - - - - - - -
RS Stock No. 311-2386
Mfr. Part No.GLAB01A1B
BrandHoneywell
MYR400.70
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 447-3806
Mfr. Part No.ZCMD21
MYR151.76
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Plug 50mm 30mm
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