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. 822-5604
Mfr. Part No.Z-15GQ-B7-K
BrandOmron
MYR72.88
Each
units
Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V M4 Snap Action - Screw 49.2mm 25.5mm
RS Stock No. 610-0229
Mfr. Part No.ZC2JD1
MYR506.59
Each
units
- SP NO/NC IP65 10 A Metal 240V - - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 308-1816
Mfr. Part No.GLCB01C
BrandHoneywell
MYR207.34
Each
units
Roller Plunger 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. 609-6619
Mfr. Part No.XCKP2106P16
MYR149.08
Each
units
Coil Spring DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 894-3312
Mfr. Part No.NGCMB10AX01B
BrandHoneywell
MYR126.42
Each
units
Plunger SPDT NO/NC IP67 6 A Metal 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 382-9343
Mfr. Part No.GXE51A1B
BrandHoneywell
MYR1,214.04
Each
units
Rotary Lever SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 106.5mm 65mm
RS Stock No. 125-8471
Mfr. Part No.XCMN2110L1
MYR142.01
Each
units
Spring Return Plunger DP NO/NC IP65 6 A Plastic 240V 250V Fixed Cable Snap Action OsiSense XC Fixed Cable 30mm 16mm
RS Stock No. 447-3395
Mfr. Part No.XCKP2118P16
MYR120.68
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 311-2140
Mfr. Part No.GLCB06A9A
BrandHoneywell
MYR265.42
Each
units
Rotary Lever DPST 2NC 2NC IP66 10 A Die Cast Zinc 300V 300V Internal Screw Terminal Contact Block Slow Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 700-4276
Mfr. Part No.ZCKJ2H7
MYR288.95
Each
units
- DP 2NO/2NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 73mm 30mm
RS Stock No. 246-3087
Mfr. Part No.14CE2-3
BrandHoneywell
MYR384.47
Each
units
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 753-0012
Mfr. Part No.D4E-1A20N
BrandOmron
MYR204.22
Each
units
Roller Plunger SPDT NO/NC IP67 5 A - 125V - Screw Snap Action - Screw 57mm 32.9mm
RS Stock No. 539-236
Mfr. Part No.83139103
BrandCrouzet
MYR197.99
Each
units
Plunger SPDT - - - - - - - - - Wire Lead - -
RS Stock No. 422-9463
Mfr. Part No.9007TUB4M11
MYR901.62
Each
units
Lever SPDT NO/NC IP66 150 A Die Cast Zinc 600V 600V - Snap Action 9007 Conduit 61.98mm 59mm
RS Stock No. 447-3468
Mfr. Part No.XCKD2118P16
MYR176.15
Each
units
Lever DP NO/NC - 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 776-8526
Mfr. Part No.Z15GNJ55B
BrandOmron
MYR121.79
Each
units
Coil Spring SPDT NO/NC IP62 15 A Thermosetting Resin 250V 250V Screw Snap Action - Screw 49.2mm 111.3mm
RS Stock No. 776-8567
Mfr. Part No.Z-15GW4-B
BrandOmron
MYR49.60
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 808-2895
Mfr. Part No.LSA2B
BrandHoneywell
MYR729.58
Each
units
Rotary Lever DPDT 2NO/2NC IP65, IP66, IP67 10 A Die Cast Zinc 600V 250V 3/4 in NPT Conduit Snap Action HDLS Plug In 47.8mm 45.3mm
RS Stock No. 423-5294
Mfr. Part No.Z15GK55B
BrandOmron
MYR102.27
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 37.4mm 49.2mm
RS Stock No. 700-4188
Mfr. Part No.ZCT21P16
MYR91.50
Each
units
- DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
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