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.

...
Read more Read less

Filters

Viewing 81 - 100 of 1346 products
Results per page
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. 808-7597
Mfr. Part No.DTF2-2RN-RH
BrandHoneywell
TWD4,835.00
Each
units
Plunger DPDT 2NO/2NC - 10 A Die Cast Aluminium 250V 250V 1/2 in NPT Conduit Snap Action - - 101.6mm 33.02mm
RS Stock No. 776-8560
Mfr. Part No.Z-15GW-B
BrandOmron
TWD338.00
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 410-7032
Mfr. Part No.ENM2-SU1Z IW
TWD1,451.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 382-1119
Mfr. Part No.071687 & ATB11-2
BrandEaton
TWD920.00
Each
units
- - NO/NC IP65 10 A - 500V 220V - Snap Action - - 59.2mm 30mm
RS Stock No. 776-8573
Mfr. Part No.Z-15HW78
BrandOmron
TWD482.00
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 250V 250V Solder Snap Action - PCB Pin 49.2mm 32.4mm
RS Stock No. 827-9128
Mfr. Part No.D4A-1101-N
BrandOmron
TWD4,480.00
Each
units
Roller Lever SPDT NO/NC IP67 10 A - 600V 250V 1/2 in NPT Conduit Snap Action - Screw 75.5mm 42mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
TWD2,641.00
Each
units
Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
TWD2,268.00
Each
units
Roller Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 56mm
RS Stock No. 311-2415
Mfr. Part No.GLAB01A2B
BrandHoneywell
TWD3,435.00
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 821-1340
Mfr. Part No.LSYJC1A-7N
BrandHoneywell
TWD6,121.00
Each
units
Coil Spring SPDT NO/NC IP65, IP66, IP67 10 A Die Cast Zinc 600V 250V 0.5 in 14 NPT Conduit Snap Action HDLS Conduit 210.03mm 1.62in
RS Stock No. 902-6935
BrandRS PRO
TWD1,065.00
Each
units
Adjustable Lever DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 158mm
RS Stock No. 700-4239
Mfr. Part No.ZCD21M12
TWD1,279.00
Each
units
- DP NO/NC - 1.5 A Metal 240V 250V - Snap Action OsiSense XC M12 Connector 65mm 31mm
RS Stock No. 183-2767
Mfr. Part No.XCMW102
TWD9,139.00
Each
units
Plunger - - - - Metal - - - - XC - - -
RS Stock No. 808-2716
Mfr. Part No.914CE2-Q1
BrandHoneywell
TWD2,816.00
Each
units
Roller Plunger SPDT NO/NC IP66, IP67, IP68 3 A Die Cast Zinc 250V - Cable Snap Action 14CE, 914CE M12 Connector 40mm 16mm
RS Stock No. 203-3868
Mfr. Part No.3SE5234-1LC05-1AD5
BrandSiemens
TWD4,890.00
Each
units
Rounded Plunger DPDT 1 NO/2 NC IP65 4 A Plastic 125V - - Snap Action - - - -
RS Stock No. 814-7841
Mfr. Part No.XCKD2102N12
TWD3,822.00
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. 768-6437
Mfr. Part No.3SE5212-0KC05
BrandSiemens
TWD1,335.00
Each
units
Round Plunger - NO/2NC - - Metal - - Screw - 3SE5 - 31mm 33mm
RS Stock No. 776-8564
Mfr. Part No.Z-15HW24
BrandOmron
TWD435.00
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 29.4mm
RS Stock No. 894-3371
Mfr. Part No.NGCMA50AX32L
BrandHoneywell
TWD2,013.00
Each
units
Roller Plunger DPDT 2NO/2NC IP67 10 mA Metal - 0.03V M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 302-0057
Mfr. Part No.XCLJ761H29
TWD2,528.00
Each
units
Plunger - 2NC IP66 - Metal - - Screw - XCL-J - 107mm 44mm