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. 843-1213
Mfr. Part No.AT4/11-S/I/AR
BrandEaton
HK$662.84
Each
units
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT4 Screw - -
RS Stock No. 843-1288
Mfr. Part No.AT0-11-S-IA/F
BrandEaton
HK$602.37
Each
units
Coil Spring - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT0 Screw - -
RS Stock No. 843-1250
Mfr. Part No.AT0-11-1-IA
BrandEaton
HK$372.70
Each
units
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 308-272
Mfr. Part No.LS-11S
BrandEaton
HK$199.17
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 478-1359
Mfr. Part No.LSM-02
BrandEaton
HK$218.50
Each
units
Plunger - 2NC IP66, IP67 6 A Metal 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 478-1393
Mfr. Part No.LSM-11S
BrandEaton
HK$210.61
Each
units
Plunger - NO/NC IP66, IP67 6 A Metal 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 843-1196
Mfr. Part No.AT4/11-1/I/AR
BrandEaton
HK$750.04
Each
units
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS Stock No. 843-1257
Mfr. Part No.AT0-11-1-IA/ZS
BrandEaton
HK$542.85
Each
units
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 308-250
Mfr. Part No.LS-20
BrandEaton
HK$184.00
Each
units
Plunger - 2NO IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 843-1275
Mfr. Part No.AT0-11-S-IA
BrandEaton
HK$372.70
Each
units
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 123-6429
Mfr. Part No.LS-20-CC
BrandEaton
HK$262.16
Each
units
Plunger - 2NO IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Cage Clamp Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 123-6430
Mfr. Part No.LS-S20-CC
BrandEaton
HK$262.16
Each
units
Plunger - 2NO IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Screw Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 123-6426
Mfr. Part No.LS-S11DA-CC
BrandEaton
HK$262.16
Each
units
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Screw Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 123-6431
Mfr. Part No.LS-20A-CC
BrandEaton
HK$262.16
Each
units
Plunger - 2NO IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Cage Clamp Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 843-1238
Mfr. Part No.AT4/11-S/I/R316
BrandEaton
HK$752.22
Each
units
Adjustable Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS Stock No. 382-1103
Mfr. Part No.ATB11-1
BrandEaton
HK$217.93
Each
units
- - NO/NC IP65 10 A - 500V 220V - Snap Action - - 59.2mm 30mm
RS Stock No. 123-6427
Mfr. Part No.LS-11S-CC
BrandEaton
HK$262.16
Each
units
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Cage Clamp Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 123-6432
Mfr. Part No.LS-S20A-CC
BrandEaton
HK$262.16
Each
units
Plunger - 2NO IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Screw Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 478-1365
Mfr. Part No.LSM-11
BrandEaton
HK$258.63
Each
units
Plunger SPDT NO/NC IP66, IP67 6 A @ 24 V Metal 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 31mm
RS Stock No. 123-6434
Mfr. Part No.LS-S20B-CC
BrandEaton
HK$262.16
Each
units
Plunger - 2NO IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Screw Snap Action LS-Titan - 31mm 33.5mm