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. 478-1359
Mfr. Part No.LSM-02
BrandEaton
HK$218.50
Each
units
Plunger - 2NC IP66, IP67 6 A Metal 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 230-1923
Mfr. Part No.XCKM110
HK$292.25
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 386-0366
Mfr. Part No.Z15GQ22B
BrandOmron
HK$126.94
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 360-8433
Mfr. Part No.ZCKJ11H29
HK$520.72
Each
units
- SP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 88.5mm 36mm
RS Stock No. 908-3271
Mfr. Part No.WLNJ-S2G-N
BrandOmron
HK$442.75
Each
units
Coil Spring SPST NO/NC IP67 10 A - 500V 250V PG 13.5 Snap Action WL Screw 40mm 42mm
RS Stock No. 447-3799
Mfr. Part No.ZCMD21M12
HK$419.35
Each
units
- DP NO/NC IP66, IP67 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC M12 Connector 50mm 30mm
RS Stock No. 752-9980
Mfr. Part No.D4MC-1000
BrandOmron
HK$155.77
Each
units
Lever SPDT NO/NC IP67 3 A ac, 250 mA dc - 480V 250V Screw Snap Action - Screw 70mm 48.5mm
RS Stock No. 470-4403
Mfr. Part No.ZS 236-11Z
BrandSchmersal
HK$191.00
Each
units
Plunger - NO/NC IP67 10 A Thermoplastic 230V 24V - Snap Action - Screw 61.5mm 30mm
RS Stock No. 342-382
Mfr. Part No.WLD2-G
BrandOmron
HK$504.98
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. 808-6857
Mfr. Part No.201LS1
BrandHoneywell
HK$1,324.70
Each
units
Roller Lever SPDT NO/NC - 10 A Die Cast Zinc 480V 550V 1/2 in NPT Conduit Snap Action - Plug In 48.8mm 28.2mm
RS Stock No. 843-1196
Mfr. Part No.AT4/11-1/I/AR
BrandEaton
HK$750.04
Each
units
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS Stock No. 700-4181
Mfr. Part No.ZCT21G11
HK$144.00
Each
units
- DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS Stock No. 422-9463
Mfr. Part No.9007TUB4M11
HK$1,592.69
Each
units
Lever SPDT NO/NC IP66 150 A Die Cast Zinc 600V 600V - Snap Action 9007 Conduit 61.98mm 59mm
RS Stock No. 436-0182
Mfr. Part No.Z-15GQ21-B
BrandOmron
HK$126.21
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 752-9615
Mfr. Part No.HL-5050G
BrandOmron
HK$380.92
Each
units
Coil Spring SPST NO/NC IP65 5 A ac, 400 mA dc - 250V 250V Screw Snap Action - Screw - -
RS Stock No. 894-3309
Mfr. Part No.NGCMA10AX01A1A
BrandHoneywell
HK$255.58
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Metal 240V - M12 Positive Break, Snap Action NGC Cable 30mm 32.5mm
RS Stock No. 908-3278
Mfr. Part No.WLNJ-Y-N
BrandOmron
HK$396.44
Each
units
Coil Spring SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 42mm
RS Stock No. 539-286
Mfr. Part No.83870101
BrandCrouzet
HK$411.06
Each
units
Plunger - NO/NC IP66, IP67 6 A Metal 240V 125V Cable Snap Action - - 69.9mm 30mm
RS Stock No. 207-1852
Mfr. Part No.14CE1-KQ
BrandHoneywell
HK$580.71
Each
units
Plunger SPDT NO/NC IP65 3 A - 250V - - - 14CE Plug 49mm 40mm
RS Stock No. 230-1866
Mfr. Part No.XCKS102
HK$340.00
Each
units
Plunger DP NO/NC IP65 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm