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 Series Contact Type Terminal Type Length Width
RS Stock No. 308-1664
Mfr. Part No.GLCB01A2A
BrandHoneywell
£35.05
Each
Units
Adjustable Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 308-1816
Mfr. Part No.GLCB01C
BrandHoneywell
£35.05
Each
Units
Roller Plunger SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 308-1822
Mfr. Part No.GLCB01A1A
BrandHoneywell
£31.23
Each
Units
Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 308-1838
Mfr. Part No.GLCB01E7B
BrandHoneywell
£35.05
Each
Units
Coil Spring SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 339-421
Mfr. Part No.14CE2-1
BrandHoneywell
£63.55
Each
Units
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - 14CE Snap Action Wire Lead 49mm 40mm
RS Stock No. 186-8166
Mfr. Part No.GLAC20C
BrandHoneywell
£92.95
Each
Units
Plunger DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V Snap-On GLA Snap Action 20 mm Cable 82mm 42mm
RS Stock No. 308-1951
Mfr. Part No.GLCB07A2B
BrandHoneywell
£41.90
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 GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 246-3087
Mfr. Part No.14CE2-3
BrandHoneywell
£75.87
Each
Units
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - 14CE Snap Action Wire Lead 49mm 40mm
RS Stock No. 308-1894
Mfr. Part No.GLDB01E7B
BrandHoneywell
£29.55
Each
Units
Coil Spring SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block GLD Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 186-8150
Mfr. Part No.GLAC20A1B
BrandHoneywell
£98.55
Each
Units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V - GLA Snap Action 20 mm Conduit 145.8mm 42mm
RS Stock No. 308-1844
Mfr. Part No.GLCB01A4J
BrandHoneywell
£35.05
Each
Units
Adjustable Lever SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 319-764
Mfr. Part No.14CE1-1
BrandHoneywell
£54.97
Each
Units
Plunger SP NO/NC IP65, IP67 5 A - 240V - - 14CE - - 49mm 40mm
RS Stock No. 382-9343
Mfr. Part No.GXE51A1B
BrandHoneywell
£242.09
Each
Units
Rotary Lever SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - GXS Snap Action Wire Lead 106.5mm 65mm
RS Stock No. 186-8201
Mfr. Part No.GLAC01A1B
BrandHoneywell
£80.00
Each
Units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - GLA Snap Action 20 mm Conduit 145.8mm 42mm
RS Stock No. 308-1850
Mfr. Part No.GLCB01D
BrandHoneywell
£42.63
Each
Units
Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block GLC Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 207-1975
Mfr. Part No.GLBC02E7B
BrandHoneywell
£83.78
Each
Units
Coil Spring SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - GLB Snap Action 20 mm Conduit 145.8mm 42mm
RS Stock No. 186-8251
Mfr. Part No.GLAC01A2B
BrandHoneywell
£99.52
Each
Units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - GLA Snap Action 20 mm Conduit 145.8mm 42mm
RS Stock No. 308-1888
Mfr. Part No.GLDB01A1A
BrandHoneywell
£26.98
Each
Units
Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block GLD Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 308-1872
Mfr. Part No.GLDB01C
BrandHoneywell
£31.65
Each
Units
Roller Plunger SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block GLD Snap Action PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 308-1692
Mfr. Part No.GLDB01A2A
BrandHoneywell
£29.55
Each
Units
Adjustable Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block GLD Snap Action PG13.5 Conduit 68.5mm 30.5mm