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. 808-7664
Mfr. Part No.OP-AR
BrandHoneywell
$279.46
Each
units
Rotary Lever SPDT NO/NC - 15 A Die Cast Aluminium 480V 250V 1/2 in NPT Conduit Snap Action - - 92.96mm 65.02mm
RS Stock No. 814-7933
Mfr. Part No.XCKJ10511H7
$250.94
Each
units
Roller Lever DPST NO/NC IP66 10 A Zamak® Zinc Alloy 500V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 77mm 40mm
New
RS Stock No. 221-2040
Mfr. Part No.ZC2JC16
$154.79
Each
units
- SP 1 C/O IP65 10 A Metal 500V - - - - - - -
New
RS Stock No. 221-1876
Mfr. Part No.XC2JC10131
$277.34
Each
units
Roller lever SP 1 C/O IP65, IP657 10 A Metal 500V - - Snap Action - - - -
New
RS Stock No. 221-2864
Mfr. Part No.XCKJ3961H29EX
$422.06
Each
units
Linear - 2NC/1NO IP66 6 A Metal - - - Snap - - - -
RS Stock No. 133-0057
Mfr. Part No.XCSP3702P20
$185.90
Each
units
Roller Plunger 3P NO/2NC IP66, IP67 - Plastic - - M20 - XCSP - 34mm 35mm
RS Stock No. 202-1642
Mfr. Part No.3SE5122-0CH50
BrandSiemens
$120.52
Each
units
Rotary - NO/NC - - Metal - - - - SIRIUS - - -
New
RS Stock No. 221-3025
Mfr. Part No.ZCKS7H29
$64.48
Each
units
Roller - 2 NC IP66, IP67 10 A Plastic - - - - - - - -
RS Stock No. 136-3202
Mfr. Part No.6089152048
$62.93
Each
units
Plunger SPST NO/NC IP67 - Polymeric - - Cable - I49 - 30mm 16mm
RS Stock No. 203-3989
Mfr. Part No.3SE5122-0LE01
BrandSiemens
$112.78
Each
units
Roller - 1 NO/2 NC IP66/IP67 6 A Metal 400V - - Snap Action - - - -
RS Stock No. 179-6078
Mfr. Part No.9007C52N2M11
$570.82
Each
units
Rotary SPDT-DB NO/NC IP67 6 A Zinc 600V 600V M20 x 1.5 mm Snap Action 9007 Screw 39.37mm 63.5mm
RS Stock No. 814-7885
Mfr. Part No.XCKT2106N12
$80.28
Each
units
Coil Spring DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 51mm 58mm
RS Stock No. 843-1247
Mfr. Part No.017098 & AT0-02-1-IA
BrandEaton
$91.95
Each
units
Plunger - 2NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 814-7835
Mfr. Part No.XCKP2145M12
$105.16
Each
units
Roller Lever DPST NO/NC IP66, IP67 3 A Plastic 250V - M12 Snap Action OsiSense XC 4 Pin 65mm 31mm
RS Stock No. 609-6574
Mfr. Part No.XCKML102
$196.22
Each
units
Plunger 4P NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 81mm 72mm
New
RS Stock No. 217-7111
Mfr. Part No.1LS3-4PG
BrandHoneywell
$272.10
Each
units
Side Rotary SPDT 1NC/1NO IP67 10 A - - - - - - - - -
RS Stock No. 293-7033
Mfr. Part No.3LS1-4C
BrandHoneywell
$415.88
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit - -
RS Stock No. 755-7904
Mfr. Part No.3SE5423-0CD21-1EA2
BrandSiemens
$172.08
Each
units
Roller Plunger DPST NO/NC - - - - - Cable - 3SE5 - 50mm 40mm
RS Stock No. 768-6544
Mfr. Part No.3SE5112-0KA00-1AJ0
BrandSiemens
$104.84
Each
units
Round Plunger - NO/NC - - Metal - - Screw - 3SE5 - 40.5mm 37.3mm
RS Stock No. 202-1646
Mfr. Part No.3SE5132-0CJ80
BrandSiemens
$94.00
Each
units
Rotary SPDT 1NO/1NC NO/NC IP65/IP67 - Plastic - - - - - - - -