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. 769-6241
Mfr. Part No.3SE5162-0CH01
BrandSiemens
PHP7,797.10
Each
units
Twist Lever - 2NO/2NC - - Metal - - Screw - 3SE5 - 56mm 37mm
RS Stock No. 749-7669
Mfr. Part No.3SE5232-0HE10
BrandSiemens
PHP1,983.39
Each
units
Roller Lever DPST NO/NC IP65 - Plastic - - Screw - 3SE5 - 75.7mm 31mm
RS Stock No. 755-7875
Mfr. Part No.3SE5413-0CN20-1EA2
BrandSiemens
PHP3,685.36
Each
units
Twist Lever DPST NO/NC - - - - - Cable - 3SE5 - 50mm 30mm
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
PHP3,305.65
Each
units
Roller Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 56mm
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
PHP4,466.69
Each
units
Plunger DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 684-2908
Mfr. Part No.3SE5112-0CH01
BrandSiemens
PHP4,301.00
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119.5mm 37.3mm
RS Stock No. 749-7565
Mfr. Part No.3SE5112-0BE01
BrandSiemens
PHP3,472.15
Each
units
Roller Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 749-7675
Mfr. Part No.3SE5232-0HK60
BrandSiemens
PHP2,570.61
Each
units
Twist Lever DPST NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm
RS Stock No. 749-7640
Mfr. Part No.3SE5162-0CE01
BrandSiemens
PHP7,309.79
Each
units
Roller Lever 4PST 2NO/2NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 107.7mm 56mm
RS Stock No. 749-7593
Mfr. Part No.3SE5112-0CR01
BrandSiemens
PHP3,803.94
Each
units
Spring Rod DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
PHP4,549.53
Each
units
Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 749-7656
Mfr. Part No.3SE5232-0BE10
BrandSiemens
PHP2,113.75
Each
units
Roller Lever DPST NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm
RS Stock No. 769-6248
Mfr. Part No.3SE5162-0CD02
BrandSiemens
PHP8,731.14
Each
units
Roller Plunger - 2NO/2NC - - Metal - - Screw - 3SE5 - 56mm 37mm
RS Stock No. 228-071
Mfr. Part No.3SE5242-0BC05
BrandSiemens
PHP2,100.77
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic - - Screw - 3SE5 Screw 60.7mm 55.5mm
RS Stock No. 749-7666
Mfr. Part No.3SE5232-0HK21
BrandSiemens
PHP2,089.38
Each
units
Twist Lever DPST NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm
RS Stock No. 749-7678
Mfr. Part No.3SE5232-0HR01
BrandSiemens
PHP2,947.87
Each
units
Spring Rod DPST NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm
New
RS Stock No. 213-1265
Mfr. Part No.3SE5122-0CH02
BrandSiemens
PHP5,030.79
Each
units
Rotary - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
New
RS Stock No. 216-3331
Mfr. Part No.3SE5212-0CC05-1CA0
BrandSiemens
PHP2,324.18
Each
units
Plunger - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
RS Stock No. 769-6267
Mfr. Part No.3SE5132-0CD05
BrandSiemens
PHP2,639.65
Each
units
Roller Plunger - NO/NC - - Plastic - - Screw - 3SE5 - 40.5mm 37.3mm
RS Stock No. 203-3940
Mfr. Part No.3SE5232-0LK50
BrandSiemens
PHP2,867.83
Each
units
Roller - 1 NO/2 NC IP65 6 A Plastic 400V - - Snap Action - - - -