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. 236-007
Mfr. Part No.XCKM115H29
HK$326.10
Each
units
Lever DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 283-656
Mfr. Part No.XCMD2111L1
HK$362.26
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. 843-1213
Mfr. Part No.AT4/11-S/I/AR
BrandEaton
HK$662.84
Each
units
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT4 Screw - -
RS Stock No. 843-1288
Mfr. Part No.AT0-11-S-IA/F
BrandEaton
HK$602.37
Each
units
Coil Spring - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT0 Screw - -
RS Stock No. 339-421
Mfr. Part No.14CE2-1
BrandHoneywell
HK$596.95
Each
units
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 360-8584
Mfr. Part No.ZCKM1
HK$214.70
Each
units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 64mm 58.5mm
RS Stock No. 902-6935
BrandRS PRO
HK$203.03
Each
units
Adjustable Lever DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 158mm
RS Stock No. 808-2754
Mfr. Part No.BZE6-2RN2
BrandHoneywell
HK$741.24
Each
units
Roller Lever SPDT NO/NC IP66 15 A Die Cast Zinc 600V 250V 1/2 NPT Snap Action BZE6 Screw 25.4mm 44.4mm
RS Stock No. 908-3281
Mfr. Part No.WLD18-Y-N
BrandOmron
HK$415.37
Each
units
Plunger SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 42mm
RS Stock No. 235-997
Mfr. Part No.XCKM121H29
HK$375.34
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 315-006
Mfr. Part No.EX-Q
BrandHoneywell
HK$2,011.70
Each
units
Plunger SPDT NO/NC - 15 A Aluminium 480V 250V - Snap Action - Conduit 122.17mm 3.66in
RS Stock No. 236-013
Mfr. Part No.XCKM106H29
HK$302.64
Each
units
Coil Spring DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 382-9359
Mfr. Part No.GXE51B
BrandHoneywell
HK$1,533.79
Each
units
Plunger SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 88mm 52mm
RS Stock No. 753-0012
Mfr. Part No.D4E-1A20N
BrandOmron
HK$403.94
Each
units
Roller Plunger SPDT NO/NC IP67 5 A - 125V - Screw Snap Action - Screw 57mm 32.9mm
RS Stock No. 308-1901
Mfr. Part No.GLDB01A4J
BrandHoneywell
HK$275.19
Each
units
Adjustable Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 684-2908
Mfr. Part No.3SE5112-0CH01
BrandSiemens
HK$374.00
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119.5mm 37.3mm
RS Stock No. 908-3269
Mfr. Part No.WLCA12-2NG-N
BrandOmron
HK$708.95
Each
units
Roller Lever SPST NO/NC IP67 10 A - 500V 250V PG 13.5 Snap Action WL Screw 40mm 53.2mm
RS Stock No. 447-3878
Mfr. Part No.XCMD2115L1
HK$352.52
Each
units
Lever DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 235-925
Mfr. Part No.XCKJ161
HK$534.96
Each
units
Plunger SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 609-6619
Mfr. Part No.XCKP2106P16
HK$234.79
Each
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Coil Spring DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
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