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. 776-8554
Mfr. Part No.Z-15GW2255-B
BrandOmron
PHP801.04
Each
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Roller Lever SPDT NO/NC IP62 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 39.4mm
RS Stock No. 386-0417
Mfr. Part No.Z15GW22B
BrandOmron
PHP596.16
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 386-0372
Mfr. Part No.Z15GQB
BrandOmron
PHP728.84
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 47.3mm 49.2mm
RS Stock No. 386-0366
Mfr. Part No.Z15GQ22B
BrandOmron
PHP1,103.74
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 386-0423
Mfr. Part No.Z15GW2BOMI
BrandOmron
PHP595.35
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 776-8510
Mfr. Part No.Z-15GD-B
BrandOmron
PHP623.66
Each
units
Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 30.7mm
RS Stock No. 752-9609
Mfr. Part No.HL5000G
BrandOmron
PHP2,970.08
Each
units
Roller Lever SPST NO/NC IP65 5 A ac, 400 mA dc - 250V 250V Screw Snap Action - Screw - -
RS Stock No. 908-3284
Mfr. Part No.WLNJ-G-N
BrandOmron
PHP3,285.41
Each
units
Coil Spring SPST NO/NC IP67 10 A - 500V 250V PG 13.5 Snap Action WL Screw 40mm 42mm
RS Stock No. 776-8567
Mfr. Part No.Z-15GW4-B
BrandOmron
PHP975.13
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 828-1020
Mfr. Part No.WL-CL-GN
BrandOmron
PHP4,696.36
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. 423-5294
Mfr. Part No.Z15GK55B
BrandOmron
PHP974.75
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 37.4mm 49.2mm
RS Stock No. 752-9987
Mfr. Part No.D4MC-2000
BrandOmron
PHP1,043.41
Each
units
Roller Lever SPDT NO/NC IP67 0.25 (dc) A, 3 (ac) A - 480V 250V Screw Snap Action - Screw 70mm 48.5mm
RS Stock No. 828-1014
Mfr. Part No.WL-CA2GN
BrandOmron
PHP3,376.75
Each
units
Roller Lever DPDT NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 125mm 40mm
RS Stock No. 828-1018
Mfr. Part No.WL-CA2-7GN
BrandOmron
PHP4,016.21
Each
units
Roller Lever DPDT 2NO/2NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 137mm 40mm
RS Stock No. 423-5301
Mfr. Part No.Z15HW24B
BrandOmron
PHP842.47
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 29mm 49.2mm
RS Stock No. 828-1027
Mfr. Part No.WL-CA12-GN
BrandOmron
PHP3,614.97
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. 342-382
Mfr. Part No.WLD2-G
BrandOmron
PHP4,859.87
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. 827-9128
Mfr. Part No.D4A-1101-N
BrandOmron
PHP10,308.38
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. 908-3278
Mfr. Part No.WLNJ-Y-N
BrandOmron
PHP2,739.04
Each
units
Coil Spring SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 42mm
RS Stock No. 776-8576
Mfr. Part No.Z-15HW78-B
BrandOmron
PHP1,028.92
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 250V 250V Screw Snap Action - Screw 49.2mm 32.4mm