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. 480-9110
Mfr. Part No.AZ8104CEJ
BrandPanasonic
HK$188.30
Each
units
Roller Lever DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 96.5mm 28mm
RS Stock No. 199-052
Mfr. Part No.AZ7121CEJ
BrandPanasonic
HK$95.09
Each
units
Lever SPDT NO/NC IP64 10 A - 250V 115V - - AZ7 Screw 68mm 70.5mm
RS Stock No. 199-056
Mfr. Part No.AZ7144CEJ
BrandPanasonic
HK$95.58
Each
units
Lever SPDT NO/NC IP64 10 A - 250V 115V - - AZ7 Screw 72mm 70.5mm
RS Stock No. 199-068
Mfr. Part No.AZ7110CEJ
BrandPanasonic
HK$109.07
Each
units
Plunger SPDT NO/NC IP64 10 A - 250V 115V - - AZ7 Screw 61mm 70.5mm
RS Stock No. 811-3400
Mfr. Part No.AZH1241
BrandPanasonic
HK$89.07
Each
units
Roller Lever SPDT NO/NC IP54 (Terminal), IP64 (Switch) 100 mA Plastic - 30V Wire Lead Momentary Action AZH Screw 58.9mm 18mm
RS Stock No. 199-135
Mfr. Part No.AZD1052CEJ
BrandPanasonic
HK$87.30
Each
units
Plunger DPST NO/NC IP67 6 A - 380V 220V - - AZD1 Screw 79mm 30mm
RS Stock No. 199-062
Mfr. Part No.AZ7120CEJ
BrandPanasonic
HK$76.50
Each
units
Lever SPDT NO/NC IP64 10 A - 250V 115V - - AZ7 Screw 55.5mm 70.5mm
RS Stock No. 199-131
Mfr. Part No.AZD1051CEJ
BrandPanasonic
HK$94.50
Each
units
Plunger DPST NO/NC IP67 6 A - 380V 220V - - AZD1 Screw 69mm 30mm
RS Stock No. 199-125
Mfr. Part No.AZ8111CEJ
BrandPanasonic
HK$166.50
1 Box of 1
Box(es)
Plunger DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 82.5mm 28mm
RS Stock No. 199-090
Mfr. Part No.AZD1053J
BrandPanasonic
HK$373.50
Each
units
Roller Lever DPST NO/NC IP67 6 A - 380V 220V - - AZD1 Screw 69mm 30mm
RS Stock No. 199-084
Mfr. Part No.AZD1057J
BrandPanasonic
HK$297.00
Each
units
Coil Spring DPST NO/NC IP67 6 A - 380V 220V - - AZD1 Screw 183mm 30mm
RS Stock No. 199-129
Mfr. Part No.AZ8112CEJ
BrandPanasonic
HK$216.00
Each
units
Plunger DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 94mm 28mm
RS Stock No. 199-028
Mfr. Part No.AZ8108CEJ
BrandPanasonic
HK$224.89
Each
units
Roller Lever DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 96.5mm 28mm
RS Stock No. 199-078
Mfr. Part No.AZ7166CEJ
BrandPanasonic
HK$176.60
Each
units
Coil Spring SPDT NO/NC IP64 10 A - 250V 115V - - AZ7 Screw 124.5mm 70.5mm
RS Stock No. 199-018
Mfr. Part No.AZ8107CEJ
BrandPanasonic
HK$189.00
Each
units
Coil Spring DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 96.5mm 28mm
RS Stock No. 811-3407
Mfr. Part No.AZH1224
BrandPanasonic
HK$110.81
Each
units
Lever SPDT NO/NC IP54 (Terminal), IP64 (Switch) 100 mA Plastic - 30V Wire Lead Momentary Action - Screw 58.9mm 18mm
RS Stock No. 199-002
Mfr. Part No.AZ8169CEJ
BrandPanasonic
HK$185.00
Each
units
Coil Spring DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 156mm 28mm
RS Stock No. 811-3390
Mfr. Part No.AZH1044
BrandPanasonic
HK$93.76
Each
units
Roller Lever SPDT NO/NC IP54 (Terminal), IP64 (Switch) 5 A Plastic 250V - Wire Lead Momentary Action - Screw 58.9mm 18mm
RS Stock No. 199-040
Mfr. Part No.AZ7100CEJ
BrandPanasonic
HK$76.50
Each
units
Plunger SPDT NO/NC IP64 10 A - 250V 115V - - AZ7 Screw 47mm 70.5mm