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. 808-2902
Mfr. Part No.LSA4L
BrandHoneywell
TWD6,068.00
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 Screw 47.8mm 45.3mm
RS Stock No. 293-7033
Mfr. Part No.3LS1-4C
BrandHoneywell
TWD8,465.00
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit - -
RS Stock No. 808-2814
Mfr. Part No.BZE6-2RQ8
BrandHoneywell
TWD2,073.00
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. 237-2571
Mfr. Part No.14CE101-1
BrandHoneywell
TWD5,581.00
Each
units
Plunger SPDT NO/NC IP65 5 A Die Cast Zinc 240V 250V - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 808-7664
Mfr. Part No.OP-AR
BrandHoneywell
TWD4,250.00
Each
units
Rotary Lever SPDT NO/NC - 15 A Die Cast Aluminium 480V 250V 1/2 in NPT Conduit Snap Action - - 92.96mm 65.02mm
RS Stock No. 186-8497
Mfr. Part No.GLFC01A1B
BrandHoneywell
TWD3,711.00
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 250V 250V - Snap Action GLF 20 mm Conduit 145.8mm 42mm
RS Stock No. 821-0454
Mfr. Part No.GLZ1AC
BrandHoneywell
TWD1,742.00
Each
units
Roller Plunger - - - - - - - - - GLZ - - -
RS Stock No. 311-2459
Mfr. Part No.GLAB20A1B
BrandHoneywell
TWD20,719.00
Each
units
Rotary Lever DPDT 2NO/2NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 314-996
Mfr. Part No.EX-AR
BrandHoneywell
TWD8,017.00
Each
units
Rotary Lever - - - 20 A - - - - - - Screw 2.7mm 2.75mm
RS Stock No. 308-1951
Mfr. Part No.GLCB07A2B
BrandHoneywell
TWD2,190.00
Each
units
Adjustable Roller Lever SPDT 1NO/1NC Gold Contacts NO/NC IP66 100 mA Die Cast Zinc 50V 50V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS Stock No. 808-2669
Mfr. Part No.914CE2-3
BrandHoneywell
TWD2,906.00
Each
units
Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE Wire Lead 40mm 16mm
RS Stock No. 311-2364
Mfr. Part No.GLAB01C
BrandHoneywell
TWD2,892.00
Each
units
Plunger SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 396-2529
Mfr. Part No.GXA51A2B
BrandHoneywell
TWD10,929.00
Each
units
Rotary Lever SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm
RS Stock No. 311-2112
Mfr. Part No.1LS244-4C
BrandHoneywell
TWD7,721.00
Each
units
Rotary Lever - - IP67 10 A - 480V 550V - Snap Action - 20 mm Conduit 111.4mm 40mm
RS Stock No. 808-7682
Mfr. Part No.SL1-B
BrandHoneywell
TWD5,673.00
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. 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. 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. 311-2415
Mfr. Part No.GLAB01A2B
BrandHoneywell
TWD3,787.00
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 808-7597
Mfr. Part No.DTF2-2RN-RH
BrandHoneywell
TWD4,883.00
Each
units
Plunger DPDT 2NO/2NC - 10 A Die Cast Aluminium 250V 250V 1/2 in NPT Conduit Snap Action - - 101.6mm 33.02mm
RS Stock No. 258-8091
Mfr. Part No.GSAC01C
BrandHoneywell
TWD4,043.00
Each
units
Plunger DP NO/NC - - Metal - - Screw - GSS - 141mm 42mm