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. 186-8251
Mfr. Part No.GLAC01A2B
BrandHoneywell
HK$837.96
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 308-1664
Mfr. Part No.GLCB01A2A
BrandHoneywell
HK$402.60
Each
units
Adjustable 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. 609-6675
Mfr. Part No.XCRF17
HK$1,684.26
Each
units
Lever 4P 2NO/2NC IP54 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS Stock No. 360-8562
Mfr. Part No.ZCKM1H29
HK$225.45
Each
units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 64mm 58.5mm
RS Stock No. 799-8840
BrandRS PRO
HK$2,220.80
Each
units
- - - IP67 - Aluminium - - M20 - - - - -
RS Stock No. 235-931
Mfr. Part No.XCKJ167H29
HK$661.19
Each
units
Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 207-1981
Mfr. Part No.GLBC02A4J
BrandHoneywell
HK$893.17
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLB 20 mm Conduit 145.8mm 42mm
RS Stock No. 799-8844
BrandRS PRO
HK$2,454.36
Each
units
- - - IP67 - Aluminium - - M20 - - - - -
RS Stock No. 186-8504
Mfr. Part No.GLFC01A2B
BrandHoneywell
HK$956.66
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 250V 250V - Snap Action GLF 20 mm Conduit 145.8mm 42mm
RS Stock No. 700-4245
Mfr. Part No.XCKM102
HK$360.14
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 447-3418
Mfr. Part No.XCKP2110P16
HK$187.66
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 447-3395
Mfr. Part No.XCKP2118P16
HK$189.94
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 700-4309
Mfr. Part No.XCKJ10541H29
HK$650.53
Each
units
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 447-3840
Mfr. Part No.XCMD2102L1
HK$482.90
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. 700-4295
Mfr. Part No.ZCT25P16
HK$171.90
Each
units
- DP NO/NC IP66, IP67 1.5 A Plastic 240V 250V - Slow Action OsiSense XC Screw 51mm 58mm
RS Stock No. 382-9371
Mfr. Part No.GXE51C
BrandHoneywell
HK$2,182.95
Each
units
Plunger SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 88mm 52mm
RS Stock No. 235-953
Mfr. Part No.XCKJ10541
HK$696.61
Each
units
Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 808-7474
Mfr. Part No.BXA3K
BrandHoneywell
HK$1,909.08
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Stainless Steel 600V 250V 1/2 in NPT Conduit Snap Action BX - 156.62mm 52.32mm
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. 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