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. 894-3302
Mfr. Part No.NGCMA10AX01B
BrandHoneywell
€29.24
Each
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Plunger SPDT NO/NC IP67 6 A Metal 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 308-1822
Mfr. Part No.GLCB01A1A
BrandHoneywell
€37.42
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units
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. 873-2244
Mfr. Part No.440P-MSRS11B
€44.46
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Spring Rod SPST NO/NC IP66 - Metal - - M20 - 440P - 211mm 40mm
RS Stock No. 202-3847
Mfr. Part No.GHG2610005R0005
BrandCEAG
€283.45
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- 3P NO/2NC - - Polyamide - - Screw - - - 102mm 84mm
RS Stock No. 700-4239
Mfr. Part No.ZCD21M12
€35.46
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- DP NO/NC - 1.5 A Metal 240V 250V - Snap Action OsiSense XC M12 Connector 65mm 31mm
RS Stock No. 621-1521
Mfr. Part No.D4N-112G
BrandOmron
€28.31
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Roller Lever SPDT NO/NC IP67 - - - - Screw - D4N - 73mm 31mm
RS Stock No. 700-4267
Mfr. Part No.XCKP2118G11
€21.09
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Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 235-953
Mfr. Part No.XCKJ10541
€59.94
Each
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Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 757-9159
Mfr. Part No.D4B4116N
BrandOmron
€60.43
Each
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Roller Lever DPST NO/NC - - Metal - - Screw - D4B-N - 99.5mm 40mm
RS Stock No. 186-8201
Mfr. Part No.GLAC01A1B
BrandHoneywell
€78.50
Each
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Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 382-9343
Mfr. Part No.GXE51A1B
BrandHoneywell
€209.20
Each
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Rotary Lever SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 106.5mm 65mm
RS Stock No. 334-628
Mfr. Part No.BZE7-2RN-C
BrandHoneywell
€100.32
Each
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Plunger - - IP65 - - - - - - - Screw - -
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
€31.84
Each
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Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 836-2744
Mfr. Part No.D4N1A32
BrandOmron
€20.39
Each
units
Top Roller Plunger DPST NO/NC IP67 - - - - Screw - D4N - 31mm 31.5mm
RS Stock No. 308-1951
Mfr. Part No.GLCB07A2B
BrandHoneywell
€50.20
Each
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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. 207-1981
Mfr. Part No.GLBC02A4J
BrandHoneywell
€94.02
Each
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Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLB 20 mm Conduit 145.8mm 42mm
RS Stock No. 435-0387
Mfr. Part No.ZE-Q22-2G
BrandOmron
€33.80
Each
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Plunger SPDT NO/NC IP65 15 A - 480V 250V - Snap Action - Screw 75.2mm 86mm
RS Stock No. 827-9172
Mfr. Part No.D4C-1231
BrandOmron
€67.17
Each
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Plunger SPDT NO/NC IP67 4 A @ 30 V dc, 5 A @ 250 V ac - 250V 250V Screw Snap Action - Screw 49mm 40mm
RS Stock No. 700-4194
Mfr. Part No.ZCP28
€15.48
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- DP 2NO - 1.5 A Plastic 240V 250V - Slow Action OsiSense XC Screw 65mm 31mm
RS Stock No. 246-3087
Mfr. Part No.14CE2-3
BrandHoneywell
€79.60
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Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm