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. 894-3378
Mfr. Part No.NGCMB50AX32B
BrandHoneywell
HK$485.87
Each
units
Plunger DPDT 2NO/2NC IP67 10 mA Metal - 0.03V M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 822-5608
Mfr. Part No.Z-15GW2277-B7-K
BrandOmron
HK$138.08
Each
units
Roller Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V M4 Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 843-1275
Mfr. Part No.AT0-11-S-IA
BrandEaton
HK$412.30
Each
units
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 435-0321
Mfr. Part No.ZC-Q55
BrandOmron
HK$648.88
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 60.2mm 70mm
RS Stock No. 814-8589
Mfr. Part No.9007MS02S0084
HK$1,400.48
Each
units
Roller Plunger SPDT NO/NC IP67 10 A Zamak® Zinc Alloy 125 V, 240 V 28V M12 Single Break 9007 4 Pin 44.4mm 40.1mm
RS Stock No. 700-4210
Mfr. Part No.ZCKM5
HK$153.86
Each
units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Slow Action OsiSense XC Wire Lead 64mm 58.5mm
RS Stock No. 691-7257
Mfr. Part No.LSA1A
BrandHoneywell
HK$1,087.77
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. 539-286
Mfr. Part No.83870101
BrandCrouzet
HK$463.43
Each
units
Plunger - NO/NC IP66, IP67 6 A Metal 240V 125V Cable Snap Action - - 69.9mm 30mm
RS Stock No. 760-5722
BrandRS PRO
HK$915.20
Each
units
- - NO/NC IP67 - Aluminium - - M20 - - Terminal Strip 112mm 88mm
RS Stock No. 186-8150
Mfr. Part No.GLAC20A1B
BrandHoneywell
HK$887.03
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 752-9977
Mfr. Part No.SHL-W55
BrandOmron
HK$328.21
Each
units
Lever SPDT NO/NC IP67 2 A ac, 200 mA dc - 480V 250V Screw Snap Action - Screw 73.5mm 35.9mm
RS Stock No. 447-3553
Mfr. Part No.XCKT2121P16
HK$351.09
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 51mm 58mm
RS Stock No. 814-8074
Mfr. Part No.9007C54F
HK$2,104.96
Each
units
Coil Spring SPDT NO/NC IP67 10 A Zamak® Zinc Alloy 600V - 1/2-14 NPT Conduit Snap Action 9007 Wire Lead 102mm 39mm
RS Stock No. 230-1923
Mfr. Part No.XCKM110
HK$301.09
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 908-3290
Mfr. Part No.WLCA12-2Y-N
BrandOmron
HK$751.04
Each
units
Roller Lever SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 53.2mm
RS Stock No. 902-6916
BrandRS PRO
HK$218.39
Each
units
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 232.5mm
RS Stock No. 447-3799
Mfr. Part No.ZCMD21M12
HK$435.74
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. 470-4403
Mfr. Part No.ZS 236-11Z
BrandSchmersal
HK$257.29
Each
units
Plunger - NO/NC IP67 10 A Thermoplastic 230V 24V - Snap Action - Screw 61.5mm 30mm
RS Stock No. 235-981
Mfr. Part No.XCKM102H29
HK$397.60
Each
units
Roller Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 240-2515
Mfr. Part No.GLAC07A1B
BrandHoneywell
HK$1,070.10
Each
units
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLA 20 mm Conduit 145.8mm 42mm