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.

...
Read more Read less

Filters

Viewing 1 - 20 of 223 products
Results per page
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
TWD2,336.00
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119mm 37.3mm
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
TWD2,593.00
Each
units
Plunger DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 227-977
Mfr. Part No.3SE5232-0HC05
BrandSiemens
TWD657.00
Each
units
Plunger - NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
TWD2,641.00
Each
units
Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 749-7616
Mfr. Part No.3SE5122-0BE01
BrandSiemens
TWD2,284.00
Each
units
Roller Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 56mm
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
TWD2,268.00
Each
units
Roller Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 56mm
RS Stock No. 768-6503
Mfr. Part No.3SE5122-0PA00
BrandSiemens
TWD1,579.00
Each
units
Round Plunger - 2NO/NC - - Metal - - Screw - 3SE5 - 56mm 37.8mm
RS Stock No. 768-6424
Mfr. Part No.3SE5242-0HC05-1AJ0
BrandSiemens
TWD1,763.00
Each
units
Round Plunger - NO/NC - - Plastic - - Screw - 3SE5 - 50mm 33mm
RS Stock No. 202-1643
Mfr. Part No.3SE5212-0CK50
BrandSiemens
TWD1,916.00
Each
units
Rotary - NO/NC - - Metal - - - - SIRIUS - - -
RS Stock No. 498-965
Mfr. Part No.3SE5232-0CC05
BrandSiemens
TWD910.00
Each
units
Plunger - NO/NC IP65 - Plastic - - Screw - 3SE5 - 75.7mm 31mm
New
RS Stock No. 211-0145
Mfr. Part No.3SE5162-0CH60-1AJ0
BrandSiemens
TWD6,573.00
Each
units
Roller - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
RS Stock No. 749-7634
Mfr. Part No.3SE5122-0CF01
BrandSiemens
TWD2,224.00
Each
units
Roller Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 56mm
RS Stock No. 768-6428
Mfr. Part No.3SE5212-0BC05
BrandSiemens
TWD1,311.00
Each
units
Round Plunger - NO/NC - - Metal - - Screw - 3SE5 - 31mm 33mm
RS Stock No. 202-1650
Mfr. Part No.3SE5242-0HK50
BrandSiemens
TWD1,828.00
Each
units
Roller SPDT 1NO/1NC NO/NC IP66/IP67 - Plastic - - - - - - - -
New
RS Stock No. 213-1290
Mfr. Part No.3SE5234-0HK21-1AC4
BrandSiemens
TWD2,256.00
Each
units
Roller 4P 1NO/1NC IP65 4 A Plastic 250V - - - - - - -
New
RS Stock No. 211-0146
Mfr. Part No.3SE5212-0CC05-1AJ0
BrandSiemens
TWD1,952.00
Each
units
Rounded plunger - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
New
RS Stock No. 213-1245
Mfr. Part No.3SE5112-0CD02-1AA7
BrandSiemens
TWD2,801.00
Each
units
Roller Plunger - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
RS Stock No. 768-6544
Mfr. Part No.3SE5112-0KA00-1AJ0
BrandSiemens
TWD2,156.00
Each
units
Round Plunger - NO/NC - - Metal - - Screw - 3SE5 - 40.5mm 37.3mm
RS Stock No. 755-7853
Mfr. Part No.3SE5413-0CC21-1EA2
BrandSiemens
TWD2,477.00
Each
units
Round Plunger DPST NO/NC - - - - - Cable - 3SE5 - 50mm 30mm
RS Stock No. 749-7653
Mfr. Part No.3SE5232-0BD03
BrandSiemens
TWD1,222.00
Each
units
Roller Plunger DPST NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm