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. 808-2713
Mfr. Part No.914CE2-Q
BrandHoneywell
$162.99
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
RS Stock No. 125-8460
Mfr. Part No.XCKN2118G11
$60.33
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. 470-4396
Mfr. Part No.TV1H 236-11z
BrandSchmersal
$101.88
Each
units
Lever DPDT NO/NC IP67 4 A Thermoplastic 230V 24V - Slow Action - Screw 58.5mm 30mm
RS Stock No. 776-8539
Mfr. Part No.Z-15GQ22
BrandOmron
$41.00
Each
units
Roller Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 58.9mm
RS Stock No. 308-272
Mfr. Part No.266105 & LS-11S
BrandEaton
$49.34
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 436-0198
Mfr. Part No.Z-15GW255-B
BrandOmron
$32.03
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 746-7255
Mfr. Part No.D4N-4132
BrandOmron
$55.58
Each
units
Roller Plunger DPST NO/NC - - - - - Screw - D4N - 64mm 31mm
RS Stock No. 478-1365
Mfr. Part No.266144 & LSM-11
BrandEaton
$69.75
Each
units
Plunger SPDT NO/NC IP66, IP67 6 A @ 24 V Metal 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 31mm
RS Stock No. 828-1014
Mfr. Part No.WL-CA2GN
BrandOmron
$155.47
Each
units
Roller Lever DPDT NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 125mm 40mm
RS Stock No. 753-0003
Mfr. Part No.D4MC-5020
BrandOmron
$71.18
Each
units
Roller Plunger SPDT NO/NC IP67 3 A ac, 250 mA dc - 480V 250V Screw Snap Action - Screw 70mm 47mm
RS Stock No. 746-7249
Mfr. Part No.D4N-412G
BrandOmron
$82.82
Each
units
Roller Lever DPST NO/NC - - - - - Screw - D4N - 64mm 31mm
RS Stock No. 447-3402
Mfr. Part No.XCKP2102P16
$87.14
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 691-7257
Mfr. Part No.LSA1A
BrandHoneywell
$301.52
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS Conduit 106.78mm 1.62in
RS Stock No. 230-1967
Mfr. Part No.XCKM115
$157.78
Each
units
Lever DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 684-2910
Mfr. Part No.3SE5112-0CE01
BrandSiemens
$114.67
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119mm 37.3mm
RS Stock No. 808-2754
Mfr. Part No.BZE6-2RN2
BrandHoneywell
$197.09
Each
units
Roller Lever SPDT NO/NC IP66 15 A Die Cast Zinc 600V 250V 1/2 NPT Snap Action BZE6 Screw 25.4mm 44.4mm
RS Stock No. 752-9993
Mfr. Part No.D4MC-5000
BrandOmron
$62.84
Each
units
Plunger SPDT NO/NC IP67 3 A ac, 250 mA dc - 480V 250V Screw Snap Action - Screw 70mm 47mm
RS Stock No. 821-0460
Mfr. Part No.GLZ301
BrandHoneywell
$76.59
Each
units
- SPDT - - - - - - - - GLZ - - -
RS Stock No. 902-6871
BrandRS PRO
$27.14
Each
units
Roller Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap Action - Screw 30.3mm 92mm
RS Stock No. 334-612
Mfr. Part No.BZE7-2RN2-C
BrandHoneywell
$375.14
Each
units
Roller Lever - - IP65 - - - - - - - Screw - -