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. 684-2910
Mfr. Part No.3SE5112-0CE01
BrandSiemens
$114.35
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119mm 37.3mm
New
RS Stock No. 203-3857
Mfr. Part No.3SE5112-0CT11
BrandSiemens
$196.88
Each
units
Roller - 1 NO/1 NC IP66/IP67 6 A Metal 400V - - Snap Action - - - -
New
RS Stock No. 203-3874
Mfr. Part No.3SE5242-0CC05
BrandSiemens
$55.43
Each
units
Plunger - 1 NO/1 NC IP66/IP67 6 A Plastic 400V - - Snap Action - - - -
New
RS Stock No. 203-3885
Mfr. Part No.3SE5112-1LA00
BrandSiemens
$110.87
Each
units
Basic Switch DPDT 1 NO/2 NC IP66/IP67 10 A Metal 400V - - Snap Action - - - -
New
RS Stock No. 203-3989
Mfr. Part No.3SE5122-0LE01
BrandSiemens
$109.91
Each
units
Roller - 1 NO/2 NC IP66/IP67 6 A Metal 400V - - Snap Action - - - -
New
RS Stock No. 203-3867
Mfr. Part No.3SE5114-0CH01-1AC5
BrandSiemens
$168.21
Each
units
Rotary - 1 NO/1 NC IP66/IP67 4 A Metal 125V - - Snap Action - - - -
New
RS Stock No. 203-3960
Mfr. Part No.3SE5112-0LD02
BrandSiemens
$127.50
Each
units
Roller Plunger - 1 NO/2 NC IP66/IP67 6 A Metal 400V - - Snap Action - - - -
New
RS Stock No. 203-3868
Mfr. Part No.3SE5234-1LC05-1AD5
BrandSiemens
$227.47
Each
units
Rounded Plunger DPDT 1 NO/2 NC IP65 4 A Plastic 125V - - Snap Action - - - -
New
RS Stock No. 203-4000
Mfr. Part No.3SE5232-0CE12-1CA0
BrandSiemens
$81.81
Each
units
Roller - 1 NO/1 NC IP65 6 A Plastic 400V - - Snap Action - - - -
New
RS Stock No. 203-3913
Mfr. Part No.3SE5232-0LC05-1CA0
BrandSiemens
$55.43
Each
units
Plunger - 1 NO/2 NC IP65 6 A Plastic 400V - - Snap Action - - - -
New
RS Stock No. 203-3912
Mfr. Part No.3SE5112-0CH02
BrandSiemens
$139.16
Each
units
Rotary - 1 NO/1 NC IP66/IP67 6 A Metal 400V - - Snap Action - - - -
New
RS Stock No. 203-3997
Mfr. Part No.3SE5112-0BD02
BrandSiemens
$126.35
Each
units
Roller Plunger - 1 NO/1 NC IP66/IP67 6 A Metal 400V - - - - - - -
New
RS Stock No. 203-3886
Mfr. Part No.3SE5114-0CA00-1AC5
BrandSiemens
$112.40
Each
units
Basic Switch with Plug SPDT 1 NO/1 NC IP66/IP67 10 A Metal 400V - - Snap Action - - - -
New
RS Stock No. 203-3940
Mfr. Part No.3SE5232-0LK50
BrandSiemens
$79.33
Each
units
Roller - 1 NO/2 NC IP65 6 A Plastic 400V - - Snap Action - - - -
New
RS Stock No. 203-3873
Mfr. Part No.3SE5114-0CD02-1AL0
BrandSiemens
$180.45
Each
units
Roller Plunger - 1 NO/1 NC IP66/IP67 4 A Metal 125V - - Snap Action - - - -
New
RS Stock No. 203-3887
Mfr. Part No.3SE5232-0LK21
BrandSiemens
$69.39
Each
units
Roller - 1 NO/2 NC IP65 6 A Plastic 400V - - Snap Action - - - -
RS Stock No. 684-2908
Mfr. Part No.3SE5112-0CH01
BrandSiemens
$128.36
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119.5mm 37.3mm
New
RS Stock No. 203-3961
Mfr. Part No.3SE5122-0CR01
BrandSiemens
$105.32
Each
units
Spring Rod - 1 NO/1 NC IP65/IP67 6 A Metal 400V - - Snap Action - - - -