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. 283-577
Mfr. Part No.XCMD2116L1
MYR283.57
Each
units
Lever DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 894-3371
Mfr. Part No.NGCMA50AX32L
BrandHoneywell
MYR285.66
Each
units
Roller Plunger DPDT 2NO/2NC IP67 10 mA Metal - 0.03V M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 125-2416
Mfr. Part No.NGCMB30AX01C
BrandHoneywell
MYR144.80
Each
units
Roller Plunger SPDT NO/NC IP67 550 mA @ 125 V dc, 6 A @ 120 V ac Metal 240V 250V Cable Snap Action NGC 3 m Cable 30mm 16.7mm
RS Stock No. 539-321
Mfr. Part No.83874301
BrandCrouzet
MYR395.50
Each
units
Plunger - NO/NC IP66, IP67 100 mA Metal 30V 30V Cable Snap Action - - 49mm 30mm
RS Stock No. 814-8009
Mfr. Part No.XCMD21F2L5
MYR803.12
Each
units
Plunger - NO/NC IP66, IP67, IP68 6 A Zamak® Zinc Alloy 400V - Pre Cabled Snap Action OsiSense XC Cable 50mm 30mm
RS Stock No. 308-1844
Mfr. Part No.GLCB01A4J
BrandHoneywell
MYR224.47
Each
units
Adjustable Lever SPDT 1NO/1NC NO/NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 179-9859
Mfr. Part No.9007C54CM11
MYR1,364.67
Each
units
Rotary head SPDT-DB NO/NC IP67 1.2 A Metal 600V 600V Screw Snap Action 9007 Screw 39.37mm 63.5mm
RS Stock No. 125-8454
Mfr. Part No.9007AO1
MYR127.10
Each
units
Plunger SPDT-DB NO/NC IP20 15 A Die Cast Zinc, Metal 600V 250V Screw Snap Action 9007 Screw 21.08mm 26.16mm
RS Stock No. 691-7210
Mfr. Part No.BZ-2RW863-A2
BrandHoneywell
MYR58.49
Each
units
Lever SPDT - - 15 A Plastic 125V - - Snap Action BZ Screw 28.19mm 1.94in
RS Stock No. 240-2650
Mfr. Part No.GLEB07A1B
BrandHoneywell
MYR294.74
Each
units
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLE PG13.5 Connector 106.5mm 65mm
New
RS Stock No. 195-1678
Mfr. Part No.XCKP2101P16
MYR115.86
Each
units
Lever DPST 1NC/1NO IP66, IP67 10 A Plastic 240V 250V M16 Snap Action XCKP Screw 31mm 30mm
New
RS Stock No. 195-1663
Mfr. Part No.XCKJ10541D
MYR569.06
Each
units
Roller Lever DPST 1NC/1NO IP66 3 A Zamak 50V 50V M12 Snap Action XCKJ - 40mm 59mm
New
RS Stock No. 195-1737
Mfr. Part No.ZCKS2H29
MYR194.83
Each
units
- 2P 2CO IP65 3 A Plastic 240V 250V M20 Snap Action ZCKS Screw 40mm 36mm
RS Stock No. 808-7456
Mfr. Part No.BX24P4L
BrandHoneywell
MYR4,281.41
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. 752-9999
Mfr. Part No.D4MC-3030
BrandOmron
MYR84.04
Each
units
Roller Lever SPDT NO/NC IP67 10 A - 480V 250V Screw Snap Action - Screw 70mm 48.5mm
New
RS Stock No. 195-1692
Mfr. Part No.XCMD2102L7
MYR381.74
Each
units
Roller Plunger DPST 1NC/1NO IP66, IP67, IP68 1.5 A Zamak 240V 250V Cable Snap Action XCMD - 30mm 16mm
RS Stock No. 311-2207
Mfr. Part No.GLAC06C
BrandHoneywell
MYR372.66
Each
units
Plunger - 2NC IP67 10 A Die Cast Zinc 500V 250V - Slow Action GLA 20 mm Conduit 145mm 42mm
New
RS Stock No. 195-1710
Mfr. Part No.XCMN2102L5
MYR208.84
Each
units
Roller Plunger DPST 1NC/1NO IP65 1.5 A Plastic 240V 250V Cable Snap Action XCMN - 30mm 16mm
RS Stock No. 814-8608
Mfr. Part No.XCKP2521G11
MYR257.22
Each
units
Roller Plunger - NO/NC IP66, IP67 10 A Plastic - - PG 11 Conduit Slow Action OsiSense XC Wire Lead 65mm 31mm
RS Stock No. 179-9875
Mfr. Part No.XCPR2121P20
MYR258.98
Each
units
Spring Return Roller Lever Plunger Thermoplastic 2P NO/NC IP66, IP67 3 A Plastic 240V 250V Screw Snap Action OsiSense XC Screw 31mm 39.5mm
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