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. 827-9128
Mfr. Part No.D4A-1101-N
BrandOmron
TWD4,480.00
Each
units
Roller Lever SPDT NO/NC IP67 10 A - 600V 250V 1/2 in NPT Conduit Snap Action - Screw 75.5mm 42mm
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Mfr. Part No.ENM2-SU1Z IW
TWD1,451.00
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units
- - - - - - - - - - - - - -
RS Stock No. 757-9231
Mfr. Part No.D4NS-1BF
BrandOmron
TWD1,226.00
Each
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- - 2NC IP67 10 A Plastic 240V 250V Screw - D4NS - 96mm 31mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
TWD2,641.00
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Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
TWD1,273.00
Each
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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
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Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 170.5mm
RS Stock No. 609-3856
Mfr. Part No.ZCMD21L2
TWD1,394.00
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- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 235-953
Mfr. Part No.XCKJ10541
TWD2,133.00
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Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 436-0182
Mfr. Part No.Z-15GQ21-B
BrandOmron
TWD549.00
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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
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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. 311-2112
Mfr. Part No.1LS244-4C
BrandHoneywell
TWD6,372.00
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Rotary Lever - - IP67 10 A - 480V 550V - Snap Action - 20 mm Conduit 111.4mm 40mm
RS Stock No. 308-250
Mfr. Part No.266120 & LS-20
BrandEaton
TWD832.00
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Plunger - 2NO IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 776-8560
Mfr. Part No.Z-15GW-B
BrandOmron
TWD338.00
Each
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Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 808-7682
Mfr. Part No.SL1-B
BrandHoneywell
TWD5,145.00
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Roller Plunger SPDT NO/NC IP67 5 A Die Cast Zinc 250V - Cable Snap Action SL1 Screw 18mm 59.8mm
RS Stock No. 757-9216
Mfr. Part No.D4NL-1AFG-B
BrandOmron
TWD7,099.00
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Various Options - - IP67 - Plastic - - - - D4NL - 95mm 88.5mm
RS Stock No. 776-8573
Mfr. Part No.Z-15HW78
BrandOmron
TWD482.00
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Lever SPDT NO/NC IP00 15 A Thermosetting Resin 250V 250V Solder Snap Action - PCB Pin 49.2mm 32.4mm
RS Stock No. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
TWD750.00
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Roller Lever DPST NO/NC - - - - - Screw - D4N - 64mm 31mm
RS Stock No. 125-8467
Mfr. Part No.XCKVR54D1H29
TWD4,701.00
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Crossed Rods Lever 4P 2NC IP65 10 A PBT+PC GF30 FR, Plastic 240V 125V Screw Clamp Slow Break OsiSense XC Screw 200mm 57mm
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Mfr. Part No.WLG2
BrandOmron
TWD7,046.00
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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
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Mfr. Part No.WL-CL-GN
BrandOmron
TWD3,764.00
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Adjustable Lever DPDT 1NO/2NC IP67 2 A Aluminium Alloy 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm