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. 153-3971
BrandRS PRO
MYR201.56
Each
units
Spring Multidirectional Actuator DPST NO/NC IP66 10 A Metal 400V 250V M12 Snap Action - Screw 30.3mm 32.5mm
RS Stock No. 902-6862
BrandRS PRO
MYR66.93
Each
units
Plunger DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 73mm
RS Stock No. 902-6925
BrandRS PRO
MYR153.15
Each
units
Plunger DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 60mm
RS Stock No. 902-6856
BrandRS PRO
MYR82.13
Each
units
Roller Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 106mm
RS Stock No. 447-3553
Mfr. Part No.XCKT2121P16
MYR206.86
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 51mm 58mm
RS Stock No. 776-8554
Mfr. Part No.Z-15GW2255-B
BrandOmron
MYR76.23
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. 386-0417
Mfr. Part No.Z15GW22B
BrandOmron
MYR40.06
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 386-0423
Mfr. Part No.Z15GW2BOMI
BrandOmron
MYR45.32
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 808-2757
Mfr. Part No.BZE6-2RN
BrandHoneywell
MYR258.48
Each
units
Plunger SPDT NO/NC IP66 15 A Die Cast Zinc 600V 250V 1/2 NPT Snap Action BZE6 Screw 25.4mm 44.4mm
RS Stock No. 199-028
Mfr. Part No.AZ8108CEJ
BrandPanasonic
MYR130.96
Each
units
Roller Lever DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 96.5mm 28mm
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
MYR190.24
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 308-1888
Mfr. Part No.GLDB01A1A
BrandHoneywell
MYR181.85
Each
units
Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 360-8455
Mfr. Part No.ZCKJ1
MYR197.35
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 808-2678
Mfr. Part No.914CE2-3A
BrandHoneywell
MYR426.46
Each
units
Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE Wire Lead 40mm 16mm
RS Stock No. 386-0372
Mfr. Part No.Z15GQB
BrandOmron
MYR69.36
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
MYR79.45
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 230-1951
Mfr. Part No.XCKM121
MYR296.56
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 808-3148
Mfr. Part No.GLCA01A2B
BrandHoneywell
MYR256.63
Each
units
Rotary Lever SPDT NO/NC IP66 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLC Wire Lead 30.5mm 30mm
RS Stock No. 360-8427
Mfr. Part No.ZCKJ1H29
MYR165.59
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 808-3129
Mfr. Part No.GLAA20A2B
BrandHoneywell
MYR674.17
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm
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