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. 396-2529
Mfr. Part No.GXA51A2B
BrandHoneywell
HK$2,263.68
Each
units
Rotary Lever SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm
RS Stock No. 311-2459
Mfr. Part No.GLAB20A1B
BrandHoneywell
HK$915.16
Each
units
Rotary Lever DPDT 2NO/2NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 280-8799
Mfr. Part No.XCKM106
HK$401.18
Each
units
Coil Spring DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 237-2587
Mfr. Part No.14CE102-1
BrandHoneywell
HK$1,431.45
Each
units
Plunger SPDT NO/NC IP65 5 A Die Cast Zinc 240V 250V - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 293-7055
Mfr. Part No.GLAC01A2W
BrandHoneywell
HK$874.67
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 613-8218
Mfr. Part No.07-1501-6530/01
BrandBartec
HK$956.82
Each
units
Plunger - NO/NC IP54 5 A Duroplast 250V 250V - - - Screw 29.8mm 18mm
RS Stock No. 447-3452
Mfr. Part No.XCKP2145P16
HK$223.92
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 753-0003
Mfr. Part No.D4MC-5020
BrandOmron
HK$224.92
Each
units
Roller Plunger SPDT NO/NC IP67 3 A ac, 250 mA dc - 480V 250V Screw Snap Action - Screw 70mm 47mm
RS Stock No. 308-1951
Mfr. Part No.GLCB07A2B
BrandHoneywell
HK$445.58
Each
units
Adjustable Roller Lever SPDT 1NO/1NC Gold Contacts NO/NC IP66 100 mA Die Cast Zinc 50V 50V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 308-1822
Mfr. Part No.GLCB01A1A
BrandHoneywell
HK$322.15
Each
units
Roller Lever 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
RS Stock No. 246-3087
Mfr. Part No.14CE2-3
BrandHoneywell
HK$694.08
Each
units
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 199-282
Mfr. Part No.XC2JC10111
HK$1,102.00
Each
units
Rotary Lever - - IP65 10 A Metal 240V - - Snap Action OsiSense XC Wire Lead 81mm 41mm
RS Stock No. 828-1027
Mfr. Part No.WL-CA12-GN
BrandOmron
HK$534.78
Each
units
Adjustable Roller Lever DPST NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
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. 186-8469
Mfr. Part No.GLEB01A2B
BrandHoneywell
HK$395.17
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 139mm 65mm
RS Stock No. 447-3806
Mfr. Part No.ZCMD21
HK$274.38
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Plug 50mm 30mm
RS Stock No. 609-6552
Mfr. Part No.XCKL115
HK$538.43
Each
units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 72mm 52mm
RS Stock No. 609-6798
Mfr. Part No.XE2NP2151
HK$164.84
Each
units
- DP NO/NC - 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
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. 447-3575
Mfr. Part No.ZCP21
HK$103.72
Each
units
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm