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. 691-7257
Mfr. Part No.LSA1A
BrandHoneywell
MYR534.39
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS Conduit 106.78mm 1.62in
RS Stock No. 423-5301
Mfr. Part No.Z15HW24B
BrandOmron
MYR70.75
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 29mm 49.2mm
RS Stock No. 820-7473
Mfr. Part No.BZ-2RQ1-A2
BrandHoneywell
MYR70.97
Each
units
Plunger - - IP64 - - - - - - BZ Screw - -
RS Stock No. 827-9080
Mfr. Part No.A-20GV22-B
BrandOmron
MYR76.40
Each
units
Roller Lever SPDT NO/NC IP00 20 A - 500V 250V Screw Snap Action - Screw 49.2mm 17.45mm
RS Stock No. 843-5732
Mfr. Part No.LSXA4L
BrandHoneywell
MYR1,097.85
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. 700-4324
Mfr. Part No.ZCKJ2H29
MYR270.81
Each
units
- DP 2NO/2NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 73mm 30mm
RS Stock No. 814-8006
Mfr. Part No.XCMD2502L2
MYR332.84
Each
units
Roller Plunger - NO/NC IP66, IP67, IP68 6 A Zamak® Zinc Alloy 400V - Pre Cabled Slow Action OsiSense XC Cable 50mm 30mm
RS Stock No. 447-3418
Mfr. Part No.XCKP2110P16
MYR94.94
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 447-3604
Mfr. Part No.ZCD21
MYR78.20
Each
units
- DP NO/NC - 1.5 A Metal 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 854-1625
Mfr. Part No.21CH38-18
BrandHoneywell
MYR3,007.80
Each
units
Roller Lever SPST - - 4 A - - 28V - - - Wire Lead - -
RS Stock No. 808-7686
Mfr. Part No.SL1-D
BrandHoneywell
MYR523.89
Each
units
Roller Plunger SPDT NO/NC IP67 5 A Die Cast Zinc 250V - Cable Snap Action SL1 Screw 18mm 59.8mm
RS Stock No. 470-4396
Mfr. Part No.TV1H 236-11z
BrandSchmersal
MYR160.11
Each
units
Lever DPDT NO/NC IP67 4 A Thermoplastic 230V 24V - Slow Action - Screw 58.5mm 30mm
RS Stock No. 828-1014
Mfr. Part No.WL-CA2GN
BrandOmron
MYR283.56
Each
units
Roller Lever DPDT NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 125mm 40mm
RS Stock No. 609-3755
Mfr. Part No.ZCKJ404
MYR435.53
Each
units
- DP 2NO/2NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 808-2873
Mfr. Part No.LSA1A-1A
BrandHoneywell
MYR671.62
Each
units
Rotary Lever SPDT NO/NC IP65, IP66, IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action HDLS Plug In 41.1mm 44.5mm
RS Stock No. 684-2908
Mfr. Part No.3SE5112-0CH01
BrandSiemens
MYR223.64
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119.5mm 37.3mm
RS Stock No. 808-2814
Mfr. Part No.BZE6-2RQ8
BrandHoneywell
MYR301.57
Each
units
Plunger SPDT NO/NC IP40 15 A Die Cast Zinc 600V 250V 1/2 NPT Snap Action BZE6 Screw 25.4mm 44.4mm
RS Stock No. 808-2700
Mfr. Part No.914CE2-AQ
BrandHoneywell
MYR489.70
Each
units
Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 14CE, 914CE M12 Connector 40mm 16mm
RS Stock No. 447-3575
Mfr. Part No.ZCP21
MYR67.15
Each
units
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 902-6900
BrandRS PRO
MYR80.92
Each
units
Plunger DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 75mm
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