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
New
RS Stock No. 213-1262
Mfr. Part No.3SE5122-0CC02-1AA7
BrandSiemens
SGD116.00
Each
units
Rounded plunger - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
RS Stock No. 195-1676
Mfr. Part No.XCKMR54D2H29
SGD437.29
Each
units
Lever 4PST 2NC IP66 10 A Zamak 240V 250V M20 Slow Break XCKMR Screw 200mm 59mm
New
RS Stock No. 211-0148
Mfr. Part No.3SE5232-0LK15
BrandSiemens
SGD74.72
Each
units
Roller - 1NO/2NC IP65 4 A Plastic 400V - - - - - - -
New
RS Stock No. 213-1279
Mfr. Part No.3SE5232-0HD10
BrandSiemens
SGD66.49
Each
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Roller Plunger - 1NO/1NC IP65 4 A Plastic 400V - - - - - - -
RS Stock No. 539-268
Mfr. Part No.83228001
BrandCrouzet
SGD69.16
Each
units
Plunger SP NO/NC - 10 A Polyamide 250V - Solder Pin - - - 7.5mm -
RS Stock No. 195-1689
Mfr. Part No.XCKT2510G1103
SGD52.96
Each
units
Plunger 2P 1NC/1NO IP66, IP67 10 A Plastic 240V 250V PG 11 - XCKT Screw - -
RS Stock No. 691-7178
Mfr. Part No.BA-2RQ1-A2
BrandHoneywell
SGD40.78
Each
units
Plunger SPDT - - 20 A Plastic 250V - - Snap Action - Screw 46.73mm 1.94in
RS Stock No. 136-3209
Mfr. Part No.6097152055
SGD538.74
Each
units
Push Bolt SPST NO/NC IP66, IP67 - Die Cast Aluminium - - Cable Gland - ENM2-EX - 40mm 42mm
RS Stock No. 700-4295
Mfr. Part No.ZCT25P16
SGD75.77
Each
units
- DP NO/NC IP66, IP67 1.5 A Plastic 240V 250V - Slow Action OsiSense XC Screw 51mm 58mm
RS Stock No. 189-5293
Mfr. Part No.6083000243
SGD54.04
Each
units
Roller DPST NC/NO IP66, IP67 5 A Glass Fibre Reinforced Thermoplastic 240V 24V Screw Slow Action, Snap Action I81 - 31mm 101mm
RS Stock No. 808-3117
Mfr. Part No.GLAA20A1B
BrandHoneywell
SGD166.25
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm
RS Stock No. 894-3328
Mfr. Part No.NGCMC10AX01A1A
BrandHoneywell
SGD43.91
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Metal 240V - M12 Positive Break, Snap Action NGC Cable 30mm 32.5mm
RS Stock No. 764-3427
Mfr. Part No.D4B-4113N
BrandOmron
SGD114.30
Each
units
Roller Lever DPST NO/NC IP67 - Die Cast Aluminium - - Screw - D4B-N - 99.5mm 40mm
RS Stock No. 125-8457
Mfr. Part No.XCKN2102P20
SGD28.81
Each
units
Spring Return Roller Plunger DP NO/NC IP65 10 A Plastic 240V 250V Screw Clamp Snap Action OsiSense XC Screw 30mm 30mm
RS Stock No. 195-1771
Mfr. Part No.XCSPA692
SGD69.40
Each
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- 2P 1NC/1NO IP67 - Polyamide - - Terminal - XCSP - 30mm 30mm
RS Stock No. 410-6972
Mfr. Part No.C2-SU1Z R
SGD34.89
Each
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Roller Tappet - NO/NC IP20 - Fibreglass - - Screw - C2 - 44mm 26mm
RS Stock No. 125-8471
Mfr. Part No.XCMN2110L1
SGD55.07
Each
units
Spring Return Plunger DP NO/NC IP65 6 A Plastic 240V 250V Fixed Cable Snap Action OsiSense XC Fixed Cable 30mm 16mm
RS Stock No. 843-1229
Mfr. Part No.076435 & AT4/11-S/I/H
BrandEaton
SGD202.31
Each
units
Coil Spring - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT4 Screw - -
RS Stock No. 768-6424
Mfr. Part No.3SE5242-0HC05-1AJ0
BrandSiemens
SGD80.38
Each
units
Round Plunger - NO/NC - - Plastic - - Screw - 3SE5 - 50mm 33mm
RS Stock No. 179-9985
Mfr. Part No.ZCKS1H29
SGD36.99
Each
units
- 2P NO/NC IP65 3 A Plastic 240V 250V Screw Snap Action OsiSense XC Screw 40mm 36mm