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. 447-3604
Mfr. Part No.ZCD21
TWD688.00
Each
units
- DP NO/NC - 1.5 A Metal 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 410-7032
Mfr. Part No.ENM2-SU1Z IW
TWD1,451.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 700-4197
Mfr. Part No.ZCP21M12
TWD976.00
Each
units
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC M12 Connector 65mm 31mm
RS Stock No. 609-3856
Mfr. Part No.ZCMD21L2
TWD1,463.00
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 814-8535
Mfr. Part No.9007AO2
TWD1,985.00
Each
units
Plunger SPST NO/NC IP20 15 A Plastic 600V - Cable Snap Action 9007 Screw 63.5mm 29mm
RS Stock No. 828-1020
Mfr. Part No.WL-CL-GN
BrandOmron
TWD3,806.00
Each
units
Adjustable Lever DPDT 1NO/2NC IP67 2 A Aluminium Alloy 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
RS Stock No. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
TWD1,579.00
Each
units
Round Plunger - 2NO/NC - - Metal - - Screw - 3SE5 - 56mm 37.8mm
RS Stock No. 822-5541
Mfr. Part No.WLG2
BrandOmron
TWD7,769.00
Each
units
Roller Lever SPST NO/NC IP67 5 A @ 250 V ac, 400 mA @ 125 V dc - 250V 250V G1/2 Snap Action - Conduit 40mm 94.1mm
RS Stock No. 821-0242
Mfr. Part No.51ML1
BrandHoneywell
TWD18,076.00
Each
units
Roller Lever SPDT - - 20 A - 120 V, 240 V, 480 V, 600 V 115 V, 230 V 1/2 in 14 NPT - - Conduit 153.92mm 2.12in
RS Stock No. 808-3139
Mfr. Part No.GLCA01A2A
BrandHoneywell
TWD1,421.00
Each
units
Rotary Lever SPDT NO/NC IP66 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLC Wire Lead 30.5mm 30mm
RS Stock No. 207-1969
Mfr. Part No.GLBC02A1B
BrandHoneywell
TWD3,482.00
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLB 20 mm Conduit 145.8mm 42mm
RS Stock No. 691-7216
Mfr. Part No.BZ-2RW84-A2
BrandHoneywell
TWD686.00
Each
units
Lever SPDT - - 15 A Plastic 125V - - Snap Action BZ Screw 28.19mm 1.94in
RS Stock No. 814-7784
Mfr. Part No.XCMD2106M12
TWD3,823.00
Each
units
Coil Spring SPDT NO/NC IP66, IP67, IP68 3 A Zamak® Zinc Alloy 250V - M12 Snap Action OsiSense XC 4 Pin 50mm 30mm
RS Stock No. 125-8459
Mfr. Part No.XCKN2110P20
TWD542.00
Each
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Spring Return Plunger DP NO/NC IP65 10 A Plastic 240V 250V Screw Clamp Snap Action OsiSense XC Screw 30mm 30mm
RS Stock No. 144-8402
Mfr. Part No.SZL-VL-S-F-N-M
BrandHoneywell
TWD757.00
Each
units
Coil Spring with Plastic Rod SPDT NO/NC IP67 0.05 (220 V dc) A, 0.5 (380 V ac) A Glass-Filled Die-Cast Metal 380V 220V M12 Cable Gland Snap Action SZL-VL M12 Connector 28.5mm 160mm
RS Stock No. 836-2735
Mfr. Part No.D4N112H
BrandOmron
TWD1,131.00
Each
units
Adjust Roller Lever DPST NO/NC IP67 - Metal - - Screw - D4N - 31mm 48.2mm
RS Stock No. 111-7891
Mfr. Part No.KBF2S11
BrandLovato
TWD1,004.00
Each
units
Adjustable Roller Lever SPST-NC, SPST-NO NO/NC IP20, IP65 10 A Polymer Thermoplastic 690V - Cable, 1/2 NPT Snap - Screw 30mm 165.5mm
RS Stock No. 410-7357
Mfr. Part No.I88-U1Z W
TWD842.00
Each
units
Radius - NO/NC IP65 - Fibreglass - - Screw - I88 SU/U - 62mm 22mm
RS Stock No. 207-1975
Mfr. Part No.GLBC02E7B
BrandHoneywell
TWD3,534.00
Each
units
Coil Spring SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLB 20 mm Conduit 145.8mm 42mm
RS Stock No. 435-0371
Mfr. Part No.ZE-Q-2G
BrandOmron
TWD2,582.00
Each
units
Plunger SPDT NO/NC IP65 15 A - 480V 250V - Snap Action - Screw 63.7mm 86mm