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. 742-833
Mfr. Part No.07-2911-1530/30
BrandBartec
TWD13,461.00
Each
units
Plunger - NO/NC IP66 7 A Plastic 400V 250V - Snap Action - Screw 46.2mm 25.5mm
RS Stock No. 396-2529
Mfr. Part No.GXA51A2B
BrandHoneywell
TWD10,409.00
Each
units
Rotary Lever SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm
RS Stock No. 822-5541
Mfr. Part No.WLG2
BrandOmron
TWD7,046.00
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. 235-953
Mfr. Part No.XCKJ10541
TWD2,133.00
Each
units
Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 447-3395
Mfr. Part No.XCKP2118P16
TWD702.00
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 814-7854
Mfr. Part No.XCKD2106N12
TWD3,939.00
Each
units
Coil Spring 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. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
TWD1,273.00
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 902-6865
BrandRS PRO
TWD566.00
Each
units
Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 170.5mm
RS Stock No. 808-7682
Mfr. Part No.SL1-B
BrandHoneywell
TWD5,145.00
Each
units
Roller Plunger SPDT NO/NC IP67 5 A Die Cast Zinc 250V - Cable Snap Action SL1 Screw 18mm 59.8mm
RS Stock No. 828-1020
Mfr. Part No.WL-CL-GN
BrandOmron
TWD3,764.00
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. 757-9216
Mfr. Part No.D4NL-1AFG-B
BrandOmron
TWD7,099.00
Each
units
Various Options - - IP67 - Plastic - - - - D4NL - 95mm 88.5mm
RS Stock No. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
TWD750.00
Each
units
Roller Lever DPST NO/NC - - - - - Screw - D4N - 64mm 31mm
RS Stock No. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
TWD1,533.00
Each
units
Round Plunger - 2NO/NC - - Metal - - Screw - 3SE5 - 56mm 37.8mm
RS Stock No. 821-0242
Mfr. Part No.51ML1
BrandHoneywell
TWD17,482.00
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. 700-4169
Mfr. Part No.XCKP2106G11
TWD980.00
Each
units
Coil Spring DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 418-6091
Mfr. Part No.ZCKL1
TWD1,674.00
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 72mm 30mm
RS Stock No. 814-7826
Mfr. Part No.XCKP2118N12
TWD3,116.00
Each
units
Roller Lever DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 65mm 31mm
RS Stock No. 436-0182
Mfr. Part No.Z-15GQ21-B
BrandOmron
TWD549.00
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 828-1027
Mfr. Part No.WL-CA12-GN
BrandOmron
TWD2,173.00
Each
units
Adjustable Roller Lever DPST NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
RS Stock No. 827-9217
Mfr. Part No.D4E-1F20N
BrandOmron
TWD3,225.00
Each
units
Plunger SPDT NO/NC IP67 5 A - 250V 250V Screw Snap Action - Screw 57mm 32.9mm