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. 311-2112
Mfr. Part No.1LS244-4C
BrandHoneywell
SGD259.65
Each
units
Rotary Lever - - IP67 10 A - 480V 550V - Snap Action - 20 mm Conduit 111.4mm 40mm
RS Stock No. 382-9343
Mfr. Part No.GXE51A1B
BrandHoneywell
SGD380.80
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. 311-2128
Mfr. Part No.2LS1-4CN151
BrandHoneywell
SGD204.19
Each
units
Plunger - - IP67 10 A - 480V 550V - Snap Action - - 98.6mm 40mm
RS Stock No. 240-2521
Mfr. Part No.GLAC07A2B
BrandHoneywell
SGD171.03
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. 193-2015
Mfr. Part No.LS4C3K
BrandHoneywell
SGD235.21
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS Stock No. 193-2059
Mfr. Part No.LS4A3K-2B
BrandHoneywell
SGD243.82
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS Stock No. 691-7257
Mfr. Part No.LSA1A
BrandHoneywell
SGD189.02
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. 808-2990
Mfr. Part No.LSM2D
BrandHoneywell
SGD270.74
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. 308-1664
Mfr. Part No.GLCB01A2A
BrandHoneywell
SGD69.59
Each
units
Adjustable Roller 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. 396-2535
Mfr. Part No.GXA51B
BrandHoneywell
SGD290.99
Each
units
Plunger SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm
RS Stock No. 186-8431
Mfr. Part No.GLEB01A1B
BrandHoneywell
SGD71.15
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 106.5mm 65mm
RS Stock No. 344-3618
Mfr. Part No.SSCEB31A1B
BrandHoneywell
SGD141.64
Each
units
Rotary Lever SPDT NO/NC IP68 4 A Die Cast Zinc 240V - - Snap Action SSCE Wire Lead 65.1mm 16mm
RS Stock No. 193-2021
Mfr. Part No.LS4D3K
BrandHoneywell
SGD247.05
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS Stock No. 186-8166
Mfr. Part No.GLAC20C
BrandHoneywell
SGD140.64
Each
units
Plunger DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V Snap-On Snap Action GLA 20 mm Cable 82mm 42mm
RS Stock No. 308-1816
Mfr. Part No.GLCB01C
BrandHoneywell
SGD67.55
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. 319-764
Mfr. Part No.14CE1-1
BrandHoneywell
SGD124.34
Each
units
Plunger SP NO/NC IP65, IP67 5 A - 240V - - - 14CE - 49mm 40mm
RS Stock No. 186-8150
Mfr. Part No.GLAC20A1B
BrandHoneywell
SGD156.64
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 246-3093
Mfr. Part No.14CE1-3A
BrandHoneywell
SGD131.96
Each
units
Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 237-2571
Mfr. Part No.14CE101-1
BrandHoneywell
SGD238.02
Each
units
Plunger SPDT NO/NC IP65 5 A Die Cast Zinc 240V 250V - Snap Action 14CE Wire Lead 49mm 40mm
RS Stock No. 220-1930
Mfr. Part No.GLFB01B
BrandHoneywell
SGD132.25
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 250V 250V - Snap Action GLF PG13.5 Connector 145.8mm 42mm