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. 362-3189
Mfr. Part No.14CE3-1H
BrandHoneywell
TWD3,172.00
Each
units
Plunger - NO/NC IP65 3 A - 240V 1500V - - 14CE Wire Lead 49mm 40mm
RS Stock No. 814-7889
Mfr. Part No.XCKT2110N12
TWD1,295.00
Each
units
Plunger DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 51mm 58mm
RS Stock No. 386-0372
Mfr. Part No.Z15GQB
BrandOmron
TWD463.00
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 47.3mm 49.2mm
RS Stock No. 335-081
Mfr. Part No.14CE3-1
BrandHoneywell
TWD2,664.00
Each
units
Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 905-5141
Mfr. Part No.BNS026R
BrandBALLUFF
TWD6,377.00
Each
units
Plunger 2P NO/NC IP67 6 A Aluminium 250V - M20 Snap - Screw 79mm 36mm
RS Stock No. 814-7891
Mfr. Part No.XCKT2121N12
TWD1,664.00
Each
units
Roller Plunger DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 51mm 58mm
RS Stock No. 808-3107
Mfr. Part No.GLAA01B
BrandHoneywell
TWD2,884.00
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm
RS Stock No. 199-282
Mfr. Part No.XC2JC10111
TWD4,563.00
Each
units
Rotary Lever - - IP65 10 A Metal 240V - - Snap Action OsiSense XC Wire Lead 81mm 41mm
RS Stock No. 808-7456
Mfr. Part No.BX24P4L
BrandHoneywell
TWD34,583.00
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 A Stainless Steel 600V 250V 20 mm Conduit Snap Action - - 146.05mm 51.85mm
RS Stock No. 362-3195
Mfr. Part No.14CE16-1H
BrandHoneywell
TWD3,963.00
Each
units
Rotary Lever - NO/NC IP65 3 A - 240V 1500V - - 14CE Wire Lead 49mm 40mm
RS Stock No. 136-5919
Mfr. Part No.Ex ES 97 W 11 -60 c
BrandSteute
TWD9,194.00
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. 808-3173
Mfr. Part No.GLDA01C
BrandHoneywell
TWD1,186.00
Each
units
Roller Plunger SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD 1/2-14NPT Conduit 68.5mm 30.5mm
RS Stock No. 899-7892
Mfr. Part No.BZE7-2RN18-C
BrandHoneywell
TWD5,629.00
Each
units
Coil Spring - - IP65 - - - - - - - Conduit Thread - -
RS Stock No. 539-236
Mfr. Part No.83139103
BrandCrouzet
TWD2,062.00
Each
units
Plunger SPDT - - - - - - - - - Wire Lead - -
RS Stock No. 447-3519
Mfr. Part No.XCKD2145P16
TWD1,439.00
Each
units
Lever DP NO/NC - 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 539-268
Mfr. Part No.83228001
BrandCrouzet
TWD1,529.00
Each
units
Plunger SP NO/NC - 10 A Polyamide 250V - Solder Pin - - - 7.5mm -
RS Stock No. 334-612
Mfr. Part No.BZE7-2RN2-C
BrandHoneywell
TWD3,902.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 814-7882
Mfr. Part No.XCKT2102N12
TWD1,619.00
Each
units
Roller Plunger DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 51mm 58mm
RS Stock No. 308-294
Mfr. Part No.LS-11D
BrandEaton
TWD832.00
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 609-6467
Mfr. Part No.XC1AC127
TWD8,568.00
Each
units
Lever DP NO/NC IP65 10 A - 230V 230V - Slow Action OsiSense XC Screw 113mm 77mm