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. 308-1901
Mfr. Part No.GLDB01A4J
BrandHoneywell
€31.02
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. 302-0007
Mfr. Part No.XCLJ561H29
€66.32
Each
units
Plunger - NO/NC IP66 - Metal - - Screw - XCL-J - 107mm 44mm
RS Stock No. 752-9987
Mfr. Part No.D4MC-2000
BrandOmron
€19.34
Each
units
Roller Lever SPDT NO/NC IP67 0.25 (dc) A, 3 (ac) A - 480V 250V Screw Snap Action - Screw 70mm 48.5mm
RS Stock No. 362-3230
Mfr. Part No.BX4A3K-1A
BrandHoneywell
€254.99
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Aluminium 600V 250V - Snap Action BX 20 mm Conduit 146.05mm 50.8mm
RS Stock No. 700-4282
Mfr. Part No.ZCP27
€16.12
Each
units
- DP 2NC - 1.5 A Plastic 240V 250V - Slow Action OsiSense XC Screw 65mm 31mm
RS Stock No. 700-4295
Mfr. Part No.ZCT25P16
€17.70
Each
units
- DP NO/NC IP66, IP67 1.5 A Plastic 240V 250V - Slow Action OsiSense XC Screw 51mm 58mm
RS Stock No. 423-5294
Mfr. Part No.Z-15GK55B
BrandOmron
€14.37
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 37.4mm 49.2mm
RS Stock No. 821-0441
Mfr. Part No.GLCB01A2B
BrandHoneywell
€50.93
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. 410-7414
Mfr. Part No.I88-SU1Z HW
€29.11
Each
units
Roller Lever - NO/NC IP65 - Fibreglass - - Screw - I88 SU/U - 62mm 22mm
RS Stock No. 246-3116
Mfr. Part No.14CE18-1
BrandHoneywell
€71.79
Each
units
Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 609-6580
Mfr. Part No.XCKML115
€73.73
Each
units
Lever 4P NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 81mm 72mm
RS Stock No. 853-6829
Mfr. Part No.GLZ320
BrandHoneywell
€56.41
Each
units
- DPDT 2NO/2NC - - - - - - Snap Action GLZ - - -
RS Stock No. 125-8460
Mfr. Part No.XCKN2118G11
€15.55
Each
units
Spring Return Roller Lever DP NO/NC IP65 10 A Plastic 240V 250V Screw Clamp Snap Action OsiSense XC Screw 30mm 44.5mm
RS Stock No. 808-3163
Mfr. Part No.GLDA01A1B
BrandHoneywell
€29.73
Each
units
Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD 1/2-14NPT Conduit 68.5mm 30.5mm
RS Stock No. 447-3569
Mfr. Part No.XCKT2145P16
€30.36
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 51mm 58mm
RS Stock No. 498-909
Mfr. Part No.3SE5250-0KC05
BrandSiemens
€20.05
Each
units
Plunger - 2NC/1NO IP10 - Plastic - - Screw - 3SE5 - 59.2mm 30mm
RS Stock No. 814-7936
Mfr. Part No.XCKJ10541H7
€99.26
Each
units
Roller Lever - NO/NC IP66 - Zamak® Zinc Alloy - - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 84mm 42.5mm
RS Stock No. 894-3352
Mfr. Part No.NGCPB10AX01L
BrandHoneywell
€25.54
Each
units
Roller Plunger SPDT NO/NC IP67 6 A Plastic 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 335-081
Mfr. Part No.14CE3-1
BrandHoneywell
€73.03
Each
units
Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
€66.94
Each
units
Plunger DP NO/NC - - Metal - - Screw - GSS - 141mm 42mm