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. 311-2291
Mfr. Part No.GLDB06C
BrandHoneywell
kr 264,62
Each
Units
Roller Plunger DPST 2NC 2NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Slow Action GLD PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 179-9993
Mfr. Part No.ZCMD39
kr 530,40
Each
Units
- 3P 2NC/1NO - 750 mA Metal 240V 250V Screw Snap Action OsiSense XC Screw 30mm 16mm
RS Stock No. 821-0498
Mfr. Part No.LS2Z52B
BrandHoneywell
kr 597,58
Each
Units
Roller Lever - - IP65, IP66, IP67 - Stainless Steel - - - - HDLS - - 0.25in
RS Stock No. 123-6415
Mfr. Part No.176880 | LS-02-CC
BrandEaton
kr 1 760,21
Each
Units
Plunger - 2NC 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
New
RS Stock No. 195-1702
Mfr. Part No.XCMD21F0L2
kr 643,16
Each
Units
Plunger DPST 1NC/1NO IP66, IP67, IP68 1.5 A Zamak 240V 250V Cable Snap Action XCMD - 30mm 16mm
RS Stock No. 814-8535
Mfr. Part No.9007AO2
kr 344,46
Each
Units
Plunger SPST NO/NC IP20 15 A Plastic 600V - Cable Snap Action 9007 Screw 63.5mm 29mm
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
kr 556,00
Each
Units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 894-3330
Mfr. Part No.NGCPA10AX01B
BrandHoneywell
kr 231,11
Each
Units
Plunger SPDT NO/NC IP67 6 A Plastic 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
New
RS Stock No. 195-1694
Mfr. Part No.XCMD2110C12
kr 746,25
Each
Units
Plunger DPST 1NC/1NO IP66, IP67, IP68 3 A Zamak 50V 50V M12 Snap Action XCMD - 30mm 16mm
RS Stock No. 189-5294
Mfr. Part No.6083000244
kr 269,17
Each
Units
Lever, Roller DPST NC/NO IP66, IP67 5 A Glass Fibre Reinforced Thermoplastic 240V 24V Screw Slow Action, Snap Action I81 - 31mm 105.5mm
RS Stock No. 828-1018
Mfr. Part No.WL-CA2-7GN
BrandOmron
kr 495,34
Each
Units
Roller Lever DPDT 2NO/2NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 137mm 40mm
RS Stock No. 515-694
Mfr. Part No.BZE7-2RQ-C
BrandHoneywell
kr 874,16
Each
Units
Plunger - - IP50 - - - - - - - Screw - -
RS Stock No. 125-8477
Mfr. Part No.XCMN21F2L1
kr 664,00
Each
Units
Spring Return Roller Plunger DP NO/NC IP65 6 A Plastic 240V 250V Fixed Cable Snap Action OsiSense XC Fixed Cable 30mm 16mm
RS Stock No. 808-2713
Mfr. Part No.914CE2-Q
BrandHoneywell
kr 769,57
Each
Units
Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE M12 Connector 40mm 16mm
New
RS Stock No. 197-6448
Mfr. Part No.XCMWD15
kr 3 517,32
Each
Units
Roller Lever SPDT 1NC/1NO IP20 3 A Self-extinguishing plastic 240V - - - - - - -
RS Stock No. 843-1269
Mfr. Part No.AT0-11-2-IA/AR
BrandEaton
kr 437,34
Each
Units
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 418-6057
Mfr. Part No.XCKS139
kr 528,41
Each
Units
Lever DP NO/NC IP65 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm
RS Stock No. 814-7876
Mfr. Part No.XCKD2121N12
kr 404,78
Each
Units
Roller Plunger DPST NO/NC IP66, IP67 10 A Zamak® Zinc Alloy 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 65mm 31mm
RS Stock No. 220-1952
Mfr. Part No.GLFB01K8C
BrandHoneywell
kr 763,99
Each
Units
Coil Spring - NO/NC IP67 3 A - 600V 250V - - GLF PG13.5 Connector 78mm 42mm
New
RS Stock No. 195-1723
Mfr. Part No.XCRT315
kr 9 502,71
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Units
Roller Lever DPST 2CO IP65 3 A Polyester 240V 250V PG 13.5 Snap Action XCR Screw 85mm 87mm
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