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. 235-925
Mfr. Part No.XCKJ161
SGD123.51
Each
units
Plunger SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 410-7414
Mfr. Part No.I88-SU1Z HW
SGD55.03
Each
units
Roller Lever - NO/NC IP65 - Fibreglass - - Screw - I88 SU/U - 62mm 22mm
RS Stock No. 360-8455
Mfr. Part No.ZCKJ1
SGD60.19
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 776-8514
Mfr. Part No.Z-15GK55
BrandOmron
SGD22.62
Each
units
Coil Spring SPDT NO/NC IP62 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 37.4mm
RS Stock No. 742-726
Mfr. Part No.07-2511-1330/63
BrandBartec
SGD124.88
Each
units
Plunger - NO/NC IP66 7 A Plastic 400V 250V - Snap Action - Screw 46.2mm 25.5mm
RS Stock No. 342-382
Mfr. Part No.WLD2-G
BrandOmron
SGD95.25
Each
units
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. 186-8431
Mfr. Part No.GLEB01A1B
BrandHoneywell
SGD85.57
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 106.5mm 65mm
RS Stock No. 125-8467
Mfr. Part No.XCKVR54D1H29
SGD469.84
Each
units
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. 609-6675
Mfr. Part No.XCRF17
SGD371.93
Each
units
Lever 4P 2NO/2NC IP54 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS Stock No. 776-8532
Mfr. Part No.Z-15GQ8B
BrandOmron
SGD28.34
Each
units
Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 58mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
SGD74.63
Each
units
Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 344-3618
Mfr. Part No.SSCEB31A1B
BrandHoneywell
SGD152.94
Each
units
Rotary Lever SPDT NO/NC IP68 4 A Die Cast Zinc 240V - - Snap Action SSCE Wire Lead 65.1mm 16mm
RS Stock No. 193-2021
Mfr. Part No.LS4D3K
BrandHoneywell
SGD275.14
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. 386-0372
Mfr. Part No.Z-15GQB
BrandOmron
SGD20.80
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 47.3mm 49.2mm
RS Stock No. 470-4403
Mfr. Part No.ZS 236-11Z
BrandSchmersal
SGD45.74
Each
units
Plunger - NO/NC IP67 10 A Thermoplastic 230V 24V - Snap Action - Screw 61.5mm 30mm
RS Stock No. 186-8166
Mfr. Part No.GLAC20C
BrandHoneywell
SGD149.40
Each
units
Plunger DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V Snap-On Snap Action GLA 20 mm Cable 82mm 42mm
RS Stock No. 755-7847
Mfr. Part No.3SE5413-0CC20-1EA5
BrandSiemens
SGD114.60
Each
units
Round Plunger DPST NO/NC - - - - - Cable - 3SE5 - 50mm 30mm
RS Stock No. 235-931
Mfr. Part No.XCKJ167H29
SGD102.92
Each
units
Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 447-3806
Mfr. Part No.ZCMD21
SGD87.90
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Plug 50mm 30mm
RS Stock No. 308-1816
Mfr. Part No.GLCB01C
BrandHoneywell
SGD70.33
Each
units
Roller Plunger 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
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