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. 230-1872
Mfr. Part No.XCKS131
SGD87.14
Each
units
Lever DP NO/NC IP65 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm
RS Stock No. 768-6428
Mfr. Part No.3SE5212-0BC05
BrandSiemens
SGD59.74
Each
units
Round Plunger - NO/NC - - Metal - - Screw - 3SE5 - 31mm 33mm
RS Stock No. 752-9977
Mfr. Part No.SHL-W55
BrandOmron
SGD58.35
Each
units
Lever SPDT NO/NC IP67 2 A ac, 200 mA dc - 480V 250V Screw Snap Action - Screw 73.5mm 35.9mm
RS Stock No. 410-6900
Mfr. Part No.SK-A2Z M
SGD60.50
Each
units
- - - - - - - - - - - - - -
RS Stock No. 186-8560
Mfr. Part No.GLFC01E7B
BrandHoneywell
SGD167.93
Each
units
Coil Spring SPDT NO/NC IP67 10 A Die Cast Zinc 250V 250V - Snap Action GLF 20 mm Conduit 145.8mm 42mm
RS Stock No. 207-1830
Mfr. Part No.14CE16-1
BrandHoneywell
SGD153.54
Each
units
Plunger SP NO/NC IP65, IP67 5 A - 240V - - - 14CE - 49mm 40mm
New
RS Stock No. 213-1254
Mfr. Part No.3SE5112-0LH50
BrandSiemens
SGD124.40
Each
units
Roller - 1NO/2NC IP66, IP67 4 A Metal 400V - - - - - - -
New
RS Stock No. 213-1293
Mfr. Part No.3SE5242-0BE10
BrandSiemens
SGD74.35
Each
units
Roller - 1NO/1NC IP66/IP67 4 A Plastic 400V - - - - - - -
RS Stock No. 768-6538
Mfr. Part No.3SE5162-0CA00
BrandSiemens
SGD164.25
Each
units
Round Plunger - 2NO/2NC - - Metal - - Screw - 3SE5 - 56mm 37mm
RS Stock No. 894-3384
Mfr. Part No.NGCMC50AX32A1A
BrandHoneywell
SGD77.15
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 mA Metal - 0.03V M12 Positive Break, Snap Action NGC Cable 30mm 32.5mm
RS Stock No. 752-8870
Mfr. Part No.9007FTUB1M11
BrandSquare D
SGD346.48
Each
units
Rotary Lever SPDT NO/NC IP65, IP66, IP67 20 A Die Cast Zinc 600V 600V Screw Clamp Snap Action 9007 Screw 118.36mm 57.15mm
RS Stock No. 308-1872
Mfr. Part No.GLDB01C
BrandHoneywell
SGD51.02
Each
units
Roller Plunger 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. 447-3402
Mfr. Part No.XCKP2102P16
SGD50.17
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 827-9083
Mfr. Part No.A-20GV22-B7-K
BrandOmron
SGD22.76
Each
units
Roller Lever SPDT NO/NC IP00 20 A - 500V 250V Screw Snap Action - Screw 49.2mm 17.45mm
RS Stock No. 808-7670
Mfr. Part No.OPD-AR
BrandHoneywell
SGD343.90
Each
units
Rotary Lever DPDT - - 10 A Die Cast Aluminium 250V 250V 1/2 in NPT Conduit Snap Action - - 92.96mm 65.02mm
RS Stock No. 133-0057
Mfr. Part No.XCSP3702P20
SGD51.87
Each
units
Roller Plunger 3P NO/2NC IP66, IP67 - Plastic - - M20 - XCSP - 34mm 35mm
RS Stock No. 123-6427
Mfr. Part No.176881 & LS-11S-CC
BrandEaton
SGD53.27
Each
units
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Cage Clamp Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 843-1253
Mfr. Part No.045561 & AT0-11-1-IA/RS
BrandEaton
SGD94.68
Each
units
Roller Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 133-0060
Mfr. Part No.XCSM4102L2
SGD106.24
Each
units
Roller Plunger 4P 2NO/2NC IP66, IP67, IP68 - Zamak - - Pre-Cabled - XCSM - 30mm 16mm
RS Stock No. 195-1695
Mfr. Part No.XCMD2110L2
SGD84.49
Each
units
Plunger DPST 1NC/1NO IP66, IP67, IP68 1.5 A Zamak 240V 250V Cable Snap Action XCMD - 30mm 16mm
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