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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Omschrijving Prijs 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-stocknr. 258-8215
FabrikantnummerGSAC20D
FabrikantHoneywell
104,85 €
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Roller Arm 4P 2NO/2NC - - Metal - - Screw - GSS - 141mm 42mm
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Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
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Fabrikantnummer3SE5122-0LA00-1AJ0
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Round Plunger - NO/NC - - Metal - - Screw - 3SE5 - 31mm 33mm
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FabrikantnummerZE-N-2G
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Plunger SPDT NO/NC IP65 15 A - 480V 250V - Snap Action - Screw 71.3mm 86mm
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Plunger SPDT NO/NC IP62 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 25.1mm
RS-stocknr. 755-7869
Fabrikantnummer3SE5413-0CD20-1EB1
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RS-stocknr. 776-8520
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Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 47.3mm
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FabrikantOmron
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RS-stocknr. 700-4245
FabrikantnummerXCKM102
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RS-stocknr. 700-4201
FabrikantnummerZCMD25L2
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- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Slow Action OsiSense XC Wire Lead - -
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FabrikantnummerBXA3K
FabrikantHoneywell
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Rotary Lever SPDT NO/NC IP67 10 A Stainless Steel 600V 250V 1/2 in NPT Conduit Snap Action BX - 156.62mm 52.32mm
RS-stocknr. 293-7055
FabrikantnummerGLAC01A2W
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Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
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FabrikantnummerXCKL102
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Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 72mm 52mm
RS-stocknr. 776-8545
FabrikantnummerZ15GW
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Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 29.4mm
RS-stocknr. 539-296
Fabrikantnummer83733327
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RS-stocknr. 199-254
FabrikantnummerXCMD25F2L1
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Plunger DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Slow Action OsiSense XC Wire Lead 50mm 30mm
RS-stocknr. 757-9140
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RS-stocknr. 308-288
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Plunger - 2NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
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