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. 308-288
Mfr. Part No.LS-02
BrandEaton
TWD764.00
Each
units
Plunger - 2NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 308-266
Mfr. Part No.LS-11
BrandEaton
TWD700.00
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 821-0454
Mfr. Part No.GLZ1AC
BrandHoneywell
TWD1,212.00
Each
units
Roller Plunger - - - - - - - - - GLZ - - -
RS Stock No. 609-3862
Mfr. Part No.ZCMD21L5
TWD1,869.00
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 700-4166
Mfr. Part No.XCKP2145G11
TWD746.00
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 111-6031
Mfr. Part No.LSM-20A
BrandEaton
TWD934.00
Each
units
Plunger DPST 2NO IP66, IP67 3 A @ 24 V dc, 6 A @ 240 V ac Metal 400/415V 220V Cage Clamp - LS-Titan M20 Connector, Screw 31mm 76mm
RS Stock No. 230-1951
Mfr. Part No.XCKM121
TWD1,391.00
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 776-8548
Mfr. Part No.Z15GW2
BrandOmron
TWD334.00
Each
units
Roller Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 39.4mm
RS Stock No. 311-2459
Mfr. Part No.GLAB20A1B
BrandHoneywell
TWD4,231.00
Each
units
Rotary Lever DPDT 2NO/2NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 808-2669
Mfr. Part No.914CE2-3
BrandHoneywell
TWD2,481.00
Each
units
Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE Wire Lead 40mm 16mm
RS Stock No. 314-996
Mfr. Part No.EX-AR
BrandHoneywell
TWD7,554.00
Each
units
Rotary Lever - - - 20 A - - - - - - Screw 2.7mm 2.75mm
RS Stock No. 436-0205
Mfr. Part No.Z-15GW55-B
BrandOmron
TWD774.00
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 28.2mm 49.2mm
RS Stock No. 609-6631
Mfr. Part No.XCMD2102M12
TWD2,335.00
Each
units
Plunger DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC M12 Connector 50mm 30mm
RS Stock No. 742-833
Mfr. Part No.07-2911-1530/30
BrandBartec
TWD11,101.00
Each
units
Plunger - NO/NC IP66 7 A Plastic 400V 250V - Snap Action - Screw 46.2mm 25.5mm
RS Stock No. 360-8584
Mfr. Part No.ZCKM1
TWD819.00
Each
units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 64mm 58.5mm
RS Stock No. 308-1951
Mfr. Part No.GLCB07A2B
BrandHoneywell
TWD1,701.00
Each
units
Adjustable Roller Lever SPDT 1NO/1NC Gold Contacts NO/NC IP66 100 mA Die Cast Zinc 50V 50V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 656-7149
Mfr. Part No.ZCKJ7H29
TWD1,449.00
Each
units
- DP 2NC IP65 10 A Metal 240V 250V - Slow Action OsiSense XC Screw - -
RS Stock No. 236-007
Mfr. Part No.XCKM115H29
TWD1,404.00
Each
units
Lever DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 827-9217
Mfr. Part No.D4E-1F20N
BrandOmron
TWD2,878.00
Each
units
Plunger SPDT NO/NC IP67 5 A - 250V 250V Screw Snap Action - Screw 57mm 32.9mm
RS Stock No. 311-2415
Mfr. Part No.GLAB01A2B
BrandHoneywell
TWD2,668.00
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm