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. 808-3157
Mfr. Part No.GLCA01E7B
BrandHoneywell
TWD1,536.00
Each
units
Coil Spring SPDT NO/NC IP66 10 A Die Cast Zinc 300V 250V 1/2 in NPT Conduit Snap Action GLC Wire Lead 30.5mm 30mm
RS Stock No. 902-6907
BrandRS PRO
TWD845.00
Each
units
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 186mm
RS Stock No. 480-9110
Mfr. Part No.AZ8104CEJ
BrandPanasonic
TWD792.00
Each
units
Roller Lever DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 96.5mm 28mm
RS Stock No. 821-0441
Mfr. Part No.GLCB01A2B
BrandHoneywell
TWD1,318.00
Each
units
Adjustable Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 193-2059
Mfr. Part No.LS4A3K-2B
BrandHoneywell
TWD4,720.00
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS Stock No. 344-3630
Mfr. Part No.GLCB06A1Y
BrandHoneywell
TWD2,036.00
Each
units
Roller Lever DPST 2NC 2NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block Slow Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 814-8608
Mfr. Part No.XCKP2521G11
TWD703.00
Each
units
Roller Plunger - NO/NC IP66, IP67 10 A Plastic - - PG 11 Conduit Slow Action OsiSense XC Wire Lead 65mm 31mm
RS Stock No. 814-7829
Mfr. Part No.XCKP2121M12
TWD2,148.00
Each
units
Roller Plunger DPST NO/NC IP66, IP67 3 A Plastic 250V - M12 Snap Action OsiSense XC 4 Pin 65mm 31mm
RS Stock No. 822-5591
Mfr. Part No.Z-15GQ22A55-B5V
BrandOmron
TWD1,321.00
Each
units
Roller Plunger SPDT NO/NC IP62 15 A - 500V 250V M4 Snap Action - Screw 81.6mm 35.5mm
RS Stock No. 123-6433
Mfr. Part No.LS-20B-CC
BrandEaton
TWD1,106.00
Each
units
Plunger - 2NO 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
RS Stock No. 447-3474
Mfr. Part No.XCKD2102P16
TWD1,150.00
Each
units
Plunger DP NO/NC - 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 319-764
Mfr. Part No.14CE1-1
BrandHoneywell
TWD2,258.00
Each
units
Plunger SP NO/NC IP65, IP67 5 A - 240V - - - 14CE - 49mm 40mm
RS Stock No. 808-3160
Mfr. Part No.GLDA01A1A
BrandHoneywell
TWD928.00
Each
units
Side Rotary Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD 1/2-14NPT Conduit 68.5mm 30.5mm
RS Stock No. 902-6890
BrandRS PRO
TWD721.00
Each
units
Roller Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 108mm
RS Stock No. 123-6422
Mfr. Part No.LS-S11A-CC
BrandEaton
TWD1,019.00
Each
units
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Screw Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 323-9318
Mfr. Part No.83843701
BrandCrouzet
TWD4,548.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 814-8006
Mfr. Part No.XCMD2502L2
TWD2,150.00
Each
units
Roller Plunger - NO/NC IP66, IP67, IP68 6 A Zamak® Zinc Alloy 400V - Pre Cabled Slow Action OsiSense XC Cable 50mm 30mm
RS Stock No. 843-1266
Mfr. Part No.AT0-11-2-IA
BrandEaton
TWD1,547.00
Each
units
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 700-4191
Mfr. Part No.ZCMD25L5
TWD1,710.00
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Slow Action OsiSense XC Wire Lead - -
RS Stock No. 814-8548
Mfr. Part No.9007C52B2
TWD5,482.00
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Zamak® Zinc Alloy 600V - Cable Snap Action - Plug In 80mm 39mm