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. 752-9788
Mfr. Part No.X10GQ22B
BrandOmron
HK$240.88
Each
units
Roller Plunger SPDT NO/NC IP00 10 A Thermosetting Resin - 125V Screw Snap Action - Screw 49.2mm 24.2mm
New
RS Stock No. 195-1709
Mfr. Part No.XCMN2102L3
HK$353.84
Each
units
Roller Plunger DPST 1NC/1NO IP65 1.5 A Plastic 240V 250V Cable Snap Action XCMN - 30mm 16mm
RS Stock No. 193-2043
Mfr. Part No.LS4A3K-1B
BrandHoneywell
HK$1,386.99
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS Stock No. 179-9870
Mfr. Part No.XCKS159H29
HK$390.36
Each
units
Spring Return Round Rod Lever Thermoplastic 2P NO/NC IP66, IP67 3 A Plastic 240V 250V Screw Snap Action OsiSense XC Screw 40mm 55mm
RS Stock No. 360-8449
Mfr. Part No.ZCKJ121H29
HK$549.12
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 81.5mm 44mm
RS Stock No. 183-2769
Mfr. Part No.XCMW115
HK$1,218.40
Each
units
Roller Lever - - - - Plastic - - - - XC - - -
New
RS Stock No. 195-1686
Mfr. Part No.XCKT1587922
HK$376.38
Each
units
Roller Plunger 2P 1NC/1NO IP66, IP67 10 A Plastic 240V 250V 1/2 in NPT Snap Action XCKT Screw - -
RS Stock No. 220-1952
Mfr. Part No.GLFB01K8C
BrandHoneywell
HK$936.25
Each
units
Coil Spring - NO/NC IP67 3 A - 600V 250V - - GLF PG13.5 Connector 78mm 42mm
RS Stock No. 186-8245
Mfr. Part No.GLAC01D
BrandHoneywell
HK$795.12
Each
units
Roller Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
New
RS Stock No. 195-1750
Mfr. Part No.ZCMD39L1
HK$492.84
Each
units
- 3P 2NC/1NO - - Zamak - - Cable Snap Action ZCMD - 30mm 16mm
RS Stock No. 752-9609
Mfr. Part No.HL5000G
BrandOmron
HK$1,166.32
Each
units
Roller Lever SPST NO/NC IP65 5 A ac, 400 mA dc - 250V 250V Screw Snap Action - Screw - -
RS Stock No. 360-8427
Mfr. Part No.ZCKJ1H29
HK$637.85
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 894-3419
Mfr. Part No.NGCPB50AX32L
BrandHoneywell
HK$443.58
Each
units
Roller Plunger DPDT 2NO/2NC IP67 10 mA Plastic - 0.03V M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 435-0371
Mfr. Part No.ZE-Q-2G
BrandOmron
HK$588.04
Each
units
Plunger SPDT NO/NC IP65 15 A - 480V 250V - Snap Action - Screw 63.7mm 86mm
RS Stock No. 382-9343
Mfr. Part No.GXE51A1B
BrandHoneywell
HK$1,949.94
Each
units
Rotary Lever SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 106.5mm 65mm
RS Stock No. 700-4204
Mfr. Part No.ZCMD21L1
HK$290.00
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC M12 Connector 50mm 30mm
RS Stock No. 822-5620
Mfr. Part No.Z-15HW24-B7-K
BrandOmron
HK$129.04
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V M4 Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 189-5270
Mfr. Part No.6088803005
HK$198.83
Each
units
Plunger DPST 2NO IP65 10 A Glass Fibre Reinforced Thermoplastic 240V - Screw Slow Action, Snap Action TI2 - 30mm 57mm
RS Stock No. 447-3480
Mfr. Part No.XCKD2110P16
HK$696.11
Each
units
Plunger DP NO/NC - 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 691-7178
Mfr. Part No.BA-2RQ1-A2
BrandHoneywell
HK$217.38
Each
units
Plunger SPDT - - 20 A Plastic 250V - - Snap Action - Screw 46.73mm 1.94in
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