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. 136-5925
Mfr. Part No.Ex ES 98 R -11 -40C
BrandSteute
MYR1,251.75
Each
units
Roller/Plunger DPST NO/NC IP66 4.4 (T6) A, 6.6 (T5) A Aluminium 250V 125V Cable Positive Break, Slow Action Ex 98 Screw 1016mm 3022.6mm
RS Stock No. 136-5924
Mfr. Part No.Ex ES 98 -02 -40C
BrandSteute
MYR1,631.03
Each
units
Plunger DPST 2NC IP66 4.4 (T6) A, 6.6 (T5) A Aluminium 250V 125V Cable Positive Break, Slow Action Ex 98 Screw 1016mm 2768.6mm
RS Stock No. 136-5920
Mfr. Part No.Ex ES 97 W 02 -60 c
BrandSteute
MYR1,666.52
Each
units
Plunger with Collar DPST 2NC IP66, IP67, IP69 4 A Glass-Fibre, Thermoplastic 400V - Cable Positive Break, Slow Action Ex 97 Screw 787.4mm 2057.4mm
RS Stock No. 136-5905
Mfr. Part No.Ex 14 W 2O-5m
BrandSteute
MYR628.47
Each
units
Plunger with Collar DPST 2NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - 762mm 1719.58mm
RS Stock No. 136-5923
Mfr. Part No.Ex ES 98 -11 -40C
BrandSteute
MYR1,578.52
Each
units
Plunger DPST NO/NC IP66 4.4 (T6) A, 6.6 (T5) A Aluminium 250V 125V Cable Positive Break, Slow Action Ex 98 Screw 1016mm 2768.6mm
RS Stock No. 136-5913
Mfr. Part No.Ex 14 RUV 2O-5m
BrandSteute
MYR716.16
Each
units
Emergency-Stop Push-Button DPST 2NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - - 1778mm
RS Stock No. 136-5919
Mfr. Part No.Ex ES 97 W 11 -60 c
BrandSteute
MYR1,723.56
Each
units
Plunger with Collar DPST NO/NC IP66, IP67, IP69 4 A Glass-Fibre, Thermoplastic 500V - Cable Positive Break, Slow Action Ex 97 Screw 787.4mm 2057.4mm
RS Stock No. 136-5917
Mfr. Part No.Ex ES 97 DS 11 -60 c
BrandSteute
MYR2,031.54
Each
units
Lever DPST NO/NC IP66, IP67, IP69 4 A Glass-Fibre, Thermoplastic 500V - Cable Positive Break, Slow Action Ex 97 Screw 787.4mm 4775.2mm
RS Stock No. 136-5906
Mfr. Part No.Ex 14 WR 1O/1S-5m
BrandSteute
MYR657.72
Each
units
Roller Plunger with Collar DPST NO/NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - 762mm 1958.34mm
RS Stock No. 136-5928
Mfr. Part No.Ex ES 98 D-11 -40C
BrandSteute
MYR1,629.68
Each
units
Lever DPST NO/NC IP66 4.4 (T6) A, 6.6 (T5) A Aluminium 250V 125V Cable Positive Break, Slow Action Ex 98 Screw 1016mm 3365.5mm
RS Stock No. 136-5911
Mfr. Part No.Ex 14 RUV 1O/1S-5m
BrandSteute
MYR716.16
Each
units
Emergency-Stop Push-Button DPST NO/NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - - 1778mm
RS Stock No. 136-5903
Mfr. Part No.Ex 14 W 1O/1S-5m
BrandSteute
MYR628.47
Each
units
Plunger with Collar DPST NO/NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - 762mm 1699.26mm
RS Stock No. 136-5914
Mfr. Part No.Ex 14 RUV-S 2O-5m
BrandSteute
MYR703.80
Each
units
Emergency-Stop Push-Button DPST NO/NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - - 1778mm
RS Stock No. 136-5918
Mfr. Part No.Ex ES 97 DS 02 -60 c
BrandSteute
MYR2,031.54
Each
units
Lever DPST 2NC IP66, IP67, IP69 4 A Glass-Fibre, Thermoplastic 400V - Cable Positive Break, Slow Action Ex 97 Screw 787.4mm 2895.6mm
RS Stock No. 136-5907
Mfr. Part No.Ex 14 WR 2O-5m
BrandSteute
MYR657.72
Each
units
Roller Plunger with Collar DPST 2NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - 762mm 1958.34mm
RS Stock No. 136-5921
Mfr. Part No.Ex ES 97 R 11 -60 c
BrandSteute
MYR1,817.01
Each
units
Roller/Plunger DPST NO/NC IP66, IP67, IP69 4 A Glass-Fibre, Thermoplastic 500V - Cable Positive Break, Slow Action Ex 97 Screw 787.4mm 2316.48mm
RS Stock No. 136-5915
Mfr. Part No.Ex ES 97 D 11 -60 c
BrandSteute
MYR1,900.03
Each
units
Lever DPST NO/NC IP66, IP67, IP69 4 A Glass-Fibre, Thermoplastic 500V - Cable Positive Break, Slow Action Ex 97 Screw 787.4mm 2895.6mm
RS Stock No. 136-5909
Mfr. Part No.Ex 14 D 2O-5m
BrandSteute
MYR745.42
Each
units
Lever DPST 2NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - 762mm 838.2mm
RS Stock No. 136-5927
Mfr. Part No.Ex ES 98 R -02 -40C
BrandSteute
MYR1,593.08
Each
units
Roller/Plunger DPST 2NC IP66 4.4 (T6) A, 6.6 (T5) A Aluminium 250V 125V Cable Positive Break, Slow Action Ex 98 Screw 1016mm 3022.6mm
RS Stock No. 136-5908
Mfr. Part No.Ex 14 D 1O/1S-5m
BrandSteute
MYR745.42
Each
units
Lever DPST NO/NC IP65 250 mA @ 230 V dc, 6 A @ 250 V ac Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - 762mm 838.2mm