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. 749-7640
Mfr. Part No.3SE5162-0CE01
BrandSiemens
HK$1,316.91
Each
units
Roller Lever 4PST 2NO/2NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 107.7mm 56mm
RS Stock No. 749-7669
Mfr. Part No.3SE5232-0HE10
BrandSiemens
HK$345.73
Each
units
Roller Lever DPST NO/NC IP65 - Plastic - - Screw - 3SE5 - 75.7mm 31mm
RS Stock No. 749-7650
Mfr. Part No.3SE5232-0HD03
BrandSiemens
HK$302.12
Each
units
Roller Plunger DPST NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
HK$684.19
Each
units
Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 749-7583
Mfr. Part No.3SE5112-0CD02
BrandSiemens
HK$691.88
Each
units
Plunger DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 768-6538
Mfr. Part No.3SE5162-0CA00
BrandSiemens
HK$1,073.22
Each
units
Round Plunger - 2NO/2NC - - Metal - - Screw - 3SE5 - 56mm 37mm
RS Stock No. 684-2908
Mfr. Part No.3SE5112-0CH01
BrandSiemens
HK$497.49
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. 768-6456
Mfr. Part No.3SE5214-0LC05-1AE1
BrandSiemens
HK$379.18
Each
units
Round Plunger - 2NC - - Metal - - Screw - 3SE5 - 31mm 33mm
RS Stock No. 749-7666
Mfr. Part No.3SE5232-0HK21
BrandSiemens
HK$356.11
Each
units
Twist Lever DPST NO/NC IP65 6 A Plastic - - Screw - 3SE5 Screw 75.7mm 31mm
RS Stock No. 749-7631
Mfr. Part No.3SE5122-0CE01
BrandSiemens
HK$443.21
Each
units
Roller Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 56mm
RS Stock No. 749-7647
Mfr. Part No.3SE5132-0BA00
BrandSiemens
HK$292.21
Each
units
- DPST NO/NC IP66, IP67 6 A Plastic - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 768-6535
Mfr. Part No.3SE5112-0CA00-1AJ0
BrandSiemens
HK$543.59
Each
units
Round Plunger - NO/NC - - Metal - - Screw - 3SE5 - 40.5mm 37.3mm
New
RS Stock No. 213-1260
Mfr. Part No.3SE5122-0BH01
BrandSiemens
HK$661.35
Each
units
Rotary - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
RS Stock No. 498-961
Mfr. Part No.3SE5112-0BA00
BrandSiemens
HK$260.46
Each
units
- DP NO/NC - - Metal - - Screw - 3SE5 - 85.7mm 40.5mm
RS Stock No. 768-6437
Mfr. Part No.3SE5212-0KC05
BrandSiemens
HK$345.73
Each
units
Round Plunger - NO/2NC - - Metal - - Screw - 3SE5 - 31mm 33mm
New
RS Stock No. 213-1243
Mfr. Part No.3SE5112-0CA00-1AC1
BrandSiemens
HK$861.73
Each
units
Rounded Plunger - 1NO/1NC IP66, IP67 4 A Metal 400V - - - - - - -
New
RS Stock No. 213-0797
Mfr. Part No.3SE5322-0SG21
BrandSiemens
HK$3,685.70
Each
units
- - 2NC/1NO - - Plastic - - - - 3SE5 - - -
RS Stock No. 411-3021
Mfr. Part No.3SE2243-0XX40
BrandSiemens
HK$513.30
Each
units
- - NO/NC IP65 - Fibreglass - - Screw - 3SE5 - 90mm 52mm
RS Stock No. 498-965
Mfr. Part No.3SE5232-0CC05
BrandSiemens
HK$181.44
Each
units
Plunger - NO/NC IP65 - Plastic - - Screw - 3SE5 - 75.7mm 31mm
RS Stock No. 498-909
Mfr. Part No.3SE5250-0KC05
BrandSiemens
HK$177.24
Each
units
Plunger - 2NC/1NO IP10 - Plastic - - Screw - 3SE5 - 59.2mm 30mm