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. 700-4169
Mfr. Part No.XCKP2106G11
TWD1,010.00
Each
units
Coil Spring DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
TWD4,043.00
Each
units
Plunger DP NO/NC - - Metal - - Screw - GSS - 141mm 42mm
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
TWD1,337.00
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 748-2897
Mfr. Part No.D4C-1202
BrandOmron
TWD2,789.00
Each
units
Roller Plunger SPDT NO/NC IP67 4 A dc, 5 A ac Metal 250V 30V Screw Snap Action - Screw 51.5mm 40mm
RS Stock No. 808-6800
Mfr. Part No.1LS19
BrandHoneywell
TWD4,760.00
Each
units
Rotary Lever SPDT NO/NC - 10 A Die Cast Zinc 120 V, 240 V, 480 V - 1/2 in NPT Conduit Snap Action - Wire Lead 102.9mm 30.2mm
RS Stock No. 746-7264
Mfr. Part No.D4N-4162
BrandOmron
TWD788.00
Each
units
Roller Lever DPST NO/NC - - - - - Screw - D4N - 64mm 31mm
RS Stock No. 814-7826
Mfr. Part No.XCKP2118N12
TWD3,272.00
Each
units
Roller Lever DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 65mm 31mm
RS Stock No. 822-3923
Mfr. Part No.D5B-5011
BrandOmron
TWD3,425.00
Each
units
Plunger - - IP67 30 mA - - 30V M5 Slow Action - Screw 24.5mm 9.2 (Dia.)mm
RS Stock No. 828-1027
Mfr. Part No.WL-CA12-GN
BrandOmron
TWD2,207.00
Each
units
Adjustable Roller Lever DPST NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
RS Stock No. 235-931
Mfr. Part No.XCKJ167H29
TWD1,976.00
Each
units
Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 749-7599
Mfr. Part No.3SE5112-0CH50
BrandSiemens
TWD2,641.00
Each
units
Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS Stock No. 308-250
Mfr. Part No.266120 & LS-20
BrandEaton
TWD859.00
Each
units
Plunger - 2NO IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 311-2112
Mfr. Part No.1LS244-4C
BrandHoneywell
TWD7,405.00
Each
units
Rotary Lever - - IP67 10 A - 480V 550V - Snap Action - 20 mm Conduit 111.4mm 40mm
RS Stock No. 235-953
Mfr. Part No.XCKJ10541
TWD2,262.00
Each
units
Lever SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 822-5541
Mfr. Part No.WLG2
BrandOmron
TWD7,769.00
Each
units
Roller Lever SPST NO/NC IP67 5 A @ 250 V ac, 400 mA @ 125 V dc - 250V 250V G1/2 Snap Action - Conduit 40mm 94.1mm
RS Stock No. 342-382
Mfr. Part No.WLD2-G
BrandOmron
TWD2,106.00
Each
units
Roller Lever SPDT NO/NC IP67 10 A @ 250 V ac Die Cast Aluminium 600V 250V Snap-On Snap Action WL Conduit 96.7mm 40mm
RS Stock No. 808-2754
Mfr. Part No.BZE6-2RN2
BrandHoneywell
TWD2,577.00
Each
units
Roller Lever SPDT NO/NC IP66 15 A Die Cast Zinc 600V 250V 1/2 NPT Snap Action BZE6 Screw 25.4mm 44.4mm
RS Stock No. 821-0242
Mfr. Part No.51ML1
BrandHoneywell
TWD18,076.00
Each
units
Roller Lever SPDT - - 20 A - 120 V, 240 V, 480 V, 600 V 115 V, 230 V 1/2 in 14 NPT - - Conduit 153.92mm 2.12in
RS Stock No. 757-9231
Mfr. Part No.D4NS-1BF
BrandOmron
TWD1,300.00
Each
units
- - 2NC IP67 10 A Plastic 240V 250V Screw - D4NS - 96mm 31mm
RS Stock No. 609-3856
Mfr. Part No.ZCMD21L2
TWD1,463.00
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm