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. 902-6874
BrandRS PRO
TWD517.00
Each
units
Roller Plunger DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 84mm
RS Stock No. 843-1207
Mfr. Part No.005244 & AT4/11-1/I/S
BrandEaton
TWD2,402.00
Each
units
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS Stock No. 186-8166
Mfr. Part No.GLAC20C
BrandHoneywell
TWD2,954.00
Each
units
Plunger DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V Snap-On Snap Action GLA 20 mm Cable 82mm 42mm
RS Stock No. 822-5658
Mfr. Part No.ZE-Q22-2S
BrandOmron
TWD2,150.00
Each
units
Roller Plunger SPDT NO/NC IP65 15 A @ 480 V ac, 500 mA @ 125 V dc - 480V 250V 1/2 in 14 NPSM - - Conduit 86mm 44.5mm
RS Stock No. 207-1896
Mfr. Part No.14CE16-Q
BrandHoneywell
TWD3,720.00
Each
units
Rotary Lever SPDT - IP65 3 A - 250V - - - 14CE PG13.5 Connector 49mm 40mm
RS Stock No. 769-6740
Mfr. Part No.3SE5250-0BC05
BrandSiemens
TWD1,014.00
Each
units
Plunger - NO/NC - - Plastic - - Screw - 3SE5 - 30mm 20mm
RS Stock No. 752-8827
Mfr. Part No.9007TUB7M11
BrandSquare D
TWD21,314.00
Each
units
Rotary Lever SPDT NO/NC IP65, IP66, IP67 20 A Die Cast Zinc 600V 600V Screw Clamp Snap Action 9007 Screw 118.36mm 57.15mm
RS Stock No. 843-5732
Mfr. Part No.LSXA4L
BrandHoneywell
TWD8,246.00
Each
units
Roller Plunger DPDT 2NO/2NC - 10 A Aluminium 600V 240V 3/4-14 NPT Snap Action HDLS Conduit 50.8mm 146.3mm
RS Stock No. 189-5296
Mfr. Part No.6083000268
TWD1,216.00
Each
units
Lever, Roller DPST NC/NO IP66, IP67 5 A Glass Fibre Reinforced Thermoplastic 240V 24V Screw Slow Action, Snap Action I81 - 31mm 122.5mm
RS Stock No. 199-204
Mfr. Part No.ZCMD21L08R12
TWD3,551.00
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC M12 Connector 73mm 30mm
RS Stock No. 308-1923
Mfr. Part No.GLCB07B
BrandHoneywell
TWD1,794.00
Each
units
Plunger SPDT 1NO/1NC Gold Contacts NO/NC IP66 100 mA Die Cast Zinc 50V 50V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
New
RS Stock No. 212-4843
Mfr. Part No.XCMN2102L8
TWD2,397.00
Each
units
Roller Plunger - 1 NC + 1 NO IP65 - Plastic - - - Snap Action - - - -
RS Stock No. 203-3913
Mfr. Part No.3SE5232-0LC05-1CA0
BrandSiemens
TWD1,194.00
Each
units
Plunger - 1 NO/2 NC IP65 6 A Plastic 400V - - Snap Action - - - -
RS Stock No. 691-7207
Mfr. Part No.BZ-2RW8225551-A2
BrandHoneywell
TWD557.00
Each
units
Roller Lever SPDT - - 15 A Plastic 250V - - Snap Action BZ Screw 41.14mm 1.94in
RS Stock No. 746-7233
Mfr. Part No.D4N-1A2G
BrandOmron
TWD1,577.00
Each
units
Roller Lever DPST NO/NC - - - - - Screw - D4N - 64mm 31mm
RS Stock No. 700-4264
Mfr. Part No.ZCD39
TWD2,269.00
Each
units
- 3P NO/2NC - 750 mA Metal 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 136-5903
Mfr. Part No.Ex 14 W 1O/1S-5m
BrandSteute
TWD4,276.00
Each
units
Plunger with Collar DPST NO/NC IP65 6 A @ 250 V ac, 250 mA @ 230 V dc Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - 762mm 1699.26mm
RS Stock No. 755-7887
Mfr. Part No.3SE5413-0CN20-1EB1
BrandSiemens
TWD2,581.00
Each
units
Twist Lever DPST NO/NC - - - - - M12 - 3SE5 - 50mm 30mm
RS Stock No. 808-2615
Mfr. Part No.914CE18-9
BrandHoneywell
TWD3,344.00
Each
units
Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE Wire Lead 40mm 16mm
RS Stock No. 335-081
Mfr. Part No.14CE3-1
BrandHoneywell
TWD2,633.00
Each
units
Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm