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. 843-1196
Mfr. Part No.085925 & AT4/11-1/I/AR
BrandEaton
HK$700.70
Each
units
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS Stock No. 859-3147
Mfr. Part No.PS21L-NS11PR-M00
HK$292.65
Each
units
Roller Plunger SPDT NO/NC IP66 2.8 A @ 24 V dc, 10 A @ 24 V ac Zinc 24V 24V 1/2 in NPT Snap Action - - 30.3mm -
RS Stock No. 478-1359
Mfr. Part No.266142 & LSM-02
BrandEaton
HK$254.88
Each
units
Plunger - 2NC IP66, IP67 6 A Metal 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 814-8074
Mfr. Part No.9007C54F
HK$2,104.96
Each
units
Coil Spring SPDT NO/NC IP67 10 A Zamak® Zinc Alloy 600V - 1/2-14 NPT Conduit Snap Action 9007 Wire Lead 102mm 39mm
RS Stock No. 808-6857
Mfr. Part No.201LS1
BrandHoneywell
HK$1,341.24
Each
units
Roller Lever SPDT NO/NC - 10 A Die Cast Zinc 480V 550V 1/2 in NPT Conduit Snap Action - Plug In 48.8mm 28.2mm
RS Stock No. 827-9140
Mfr. Part No.D4A-1116-N
BrandOmron
HK$1,151.26
Each
units
Coil Spring SPDT NO/NC IP67 10 A - 600V 250V 1/2 in NPT Conduit Snap Action - Screw 75.5mm 42mm
RS Stock No. 808-7632
Mfr. Part No.EXD-Q-3
BrandHoneywell
HK$2,821.79
Each
units
Plunger DPDT 2NO/2NC - 10 A Aluminium 250V 250V - Snap Action - Wire Lead 92.96mm 65.02mm
RS Stock No. 240-2515
Mfr. Part No.GLAC07A1B
BrandHoneywell
HK$884.94
Each
units
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 436-0182
Mfr. Part No.Z-15GQ21-B
BrandOmron
HK$161.94
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 748-2897
Mfr. Part No.D4C-1202
BrandOmron
HK$656.88
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. 235-975
Mfr. Part No.XCKM110H29
HK$316.53
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 814-8589
Mfr. Part No.9007MS02S0084
HK$1,188.73
Each
units
Roller Plunger SPDT NO/NC IP67 10 A Zamak® Zinc Alloy 125 V, 240 V 28V M12 Single Break 9007 4 Pin 44.4mm 40.1mm
RS Stock No. 609-3856
Mfr. Part No.ZCMD21L2
HK$334.21
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 308-272
Mfr. Part No.266105 & LS-11S
BrandEaton
HK$202.75
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 902-6896
BrandRS PRO
HK$206.59
Each
units
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 172.5mm
RS Stock No. 435-0321
Mfr. Part No.ZC-Q55
BrandOmron
HK$676.15
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 60.2mm 70mm
RS Stock No. 908-3271
Mfr. Part No.WLNJ-S2G-N
BrandOmron
HK$493.98
Each
units
Coil Spring SPST NO/NC IP67 10 A - 500V 250V PG 13.5 Snap Action WL Screw 40mm 42mm
RS Stock No. 894-3309
Mfr. Part No.NGCMA10AX01A1A
BrandHoneywell
HK$255.58
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Metal 240V - M12 Positive Break, Snap Action NGC Cable 30mm 32.5mm
RS Stock No. 691-7216
Mfr. Part No.BZ-2RW84-A2
BrandHoneywell
HK$137.87
Each
units
Lever SPDT - - 15 A Plastic 125V - - Snap Action BZ Screw 28.19mm 1.94in
RS Stock No. 308-250
Mfr. Part No.266120 & LS-20
BrandEaton
HK$212.76
Each
units
Plunger - 2NO IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
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