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. 386-0417
Mfr. Part No.Z15GW22B
BrandOmron
TWD355.00
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 776-8508
Mfr. Part No.Z15G55
BrandOmron
TWD421.00
Each
units
Plunger SPDT NO/NC IP62 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 25.1mm
RS Stock No. 386-1397
Mfr. Part No.HL-5030
BrandOmron
TWD1,316.00
Each
units
Adjustable Roller Lever SPST NO/NC IP65 5 A - 250V 250V - Snap Action - Screw 101mm -
RS Stock No. 776-8554
Mfr. Part No.Z-15GW2255-B
BrandOmron
TWD481.00
Each
units
Roller Lever SPDT NO/NC IP62 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 39.4mm
RS Stock No. 776-8548
Mfr. Part No.Z15GW2
BrandOmron
TWD334.00
Each
units
Roller Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 39.4mm
RS Stock No. 436-0205
Mfr. Part No.Z-15GW55-B
BrandOmron
TWD491.00
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 28.2mm 49.2mm
RS Stock No. 776-8573
Mfr. Part No.Z15HW78
BrandOmron
TWD496.00
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 250V 250V Solder Snap Action - PCB Pin 49.2mm 32.4mm
RS Stock No. 342-382
Mfr. Part No.WLD2-G
BrandOmron
TWD2,010.00
Each
units
Roller Lever SPDT NO/NC IP67 10 A @ 250 V ac Die Cast Aluminium 600V 250V Snap-On Snap Action WL Conduit 96.7mm 40mm
RS Stock No. 828-1020
Mfr. Part No.WL-CL-GN
BrandOmron
TWD1,945.00
Each
units
Adjustable Lever DPDT 1NO/2NC IP67 2 A Aluminium Alloy 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
RS Stock No. 436-0182
Mfr. Part No.Z-15GQ21-B
BrandOmron
TWD517.00
Each
units
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
TWD2,193.00
Each
units
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. 776-8560
Mfr. Part No.Z-15GW-B
BrandOmron
TWD318.00
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 827-9128
Mfr. Part No.D4A-1101-N
BrandOmron
TWD5,769.00
Each
units
Roller Lever SPDT NO/NC IP67 10 A - 600V 250V 1/2 in NPT Conduit Snap Action - Screw 75.5mm 42mm
RS Stock No. 748-2897
Mfr. Part No.D4C-1202
BrandOmron
TWD2,188.00
Each
units
Roller Plunger SPDT NO/NC IP67 4 A dc, 5 A ac Metal 250V 30V Screw Snap Action - Screw 51.5mm 40mm
RS Stock No. 827-9217
Mfr. Part No.D4E-1F20N
BrandOmron
TWD2,878.00
Each
units
Plunger SPDT NO/NC IP67 5 A - 250V 250V Screw Snap Action - Screw 57mm 32.9mm
RS Stock No. 822-5541
Mfr. Part No.WLG2
BrandOmron
TWD8,457.00
Each
units
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
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
TWD1,200.00
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 822-3923
Mfr. Part No.D5B-5011
BrandOmron
TWD2,277.00
Each
units
Plunger - - IP67 30 mA - - 30V M5 Slow Action - Screw 24.5mm 9.2 (Dia.)mm
RS Stock No. 822-5601
Mfr. Part No.Z-15GQ22-B7-K
BrandOmron
TWD653.00
Each
units
Roller Plunger SPDT NO/NC IP00 15 A - 500V 250V M4 Snap Action - Screw 49.2mm 25.5mm
RS Stock No. 822-5617
Mfr. Part No.Z-15GW22-B7-K
BrandOmron
TWD316.00
Each
units
Roller Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V M4 Snap Action - Screw 49.2mm 29.4mm