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庫存編號 808-2902
製造零件編號LSA4L
BrandHoneywell
TWD6,068.00
單位
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庫存編號 293-7033
製造零件編號3LS1-4C
BrandHoneywell
TWD8,465.00
單位
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit - -
RS庫存編號 808-2814
製造零件編號BZE6-2RQ8
BrandHoneywell
TWD2,073.00
單位
Plunger SPDT NO/NC IP40 15 A Die Cast Zinc 600V 250V 1/2 NPT Snap Action BZE6 Screw 25.4mm 44.4mm
RS庫存編號 237-2571
製造零件編號14CE101-1
BrandHoneywell
TWD5,581.00
單位
Plunger SPDT NO/NC IP65 5 A Die Cast Zinc 240V 250V - Snap Action 14CE Wire Lead 49mm 40mm
RS庫存編號 808-7664
製造零件編號OP-AR
BrandHoneywell
TWD4,250.00
單位
Rotary Lever SPDT NO/NC - 15 A Die Cast Aluminium 480V 250V 1/2 in NPT Conduit Snap Action - - 92.96mm 65.02mm
RS庫存編號 186-8497
製造零件編號GLFC01A1B
BrandHoneywell
TWD3,711.00
單位
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 250V 250V - Snap Action GLF 20 mm Conduit 145.8mm 42mm
RS庫存編號 821-0454
製造零件編號GLZ1AC
BrandHoneywell
TWD1,742.00
單位
Roller Plunger - - - - - - - - - GLZ - - -
RS庫存編號 311-2459
製造零件編號GLAB20A1B
BrandHoneywell
TWD20,719.00
單位
Rotary Lever DPDT 2NO/2NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS庫存編號 314-996
製造零件編號EX-AR
BrandHoneywell
TWD8,017.00
單位
Rotary Lever - - - 20 A - - - - - - Screw 2.7mm 2.75mm
RS庫存編號 808-2669
製造零件編號914CE2-3
BrandHoneywell
TWD2,906.00
單位
Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE Wire Lead 40mm 16mm
RS庫存編號 308-1951
製造零件編號GLCB07A2B
BrandHoneywell
TWD2,190.00
單位
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庫存編號 821-0242
製造零件編號51ML1
BrandHoneywell
TWD18,076.00
單位
Roller Lever SPDT - - 20 A - 120 V, 240 V, 480 V, 600 V 115 V, 230 V 1/2 in 14 NPT - - Conduit 153.92mm 2.12in
RS庫存編號 258-8091
製造零件編號GSAC01C
BrandHoneywell
TWD4,043.00
單位
Plunger DP NO/NC - - Metal - - Screw - GSS - 141mm 42mm
RS庫存編號 808-7597
製造零件編號DTF2-2RN-RH
BrandHoneywell
TWD4,883.00
單位
Plunger DPDT 2NO/2NC - 10 A Die Cast Aluminium 250V 250V 1/2 in NPT Conduit Snap Action - - 101.6mm 33.02mm
RS庫存編號 311-2364
製造零件編號GLAB01C
BrandHoneywell
TWD2,892.00
單位
Plunger SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS庫存編號 808-2754
製造零件編號BZE6-2RN2
BrandHoneywell
TWD2,577.00
單位
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庫存編號 808-7682
製造零件編號SL1-B
BrandHoneywell
TWD5,673.00
單位
Roller Plunger SPDT NO/NC IP67 5 A Die Cast Zinc 250V - Cable Snap Action SL1 Screw 18mm 59.8mm
RS庫存編號 396-2529
製造零件編號GXA51A2B
BrandHoneywell
TWD10,929.00
單位
Rotary Lever SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm
RS庫存編號 311-2112
製造零件編號1LS244-4C
BrandHoneywell
TWD7,721.00
單位
Rotary Lever - - IP67 10 A - 480V 550V - Snap Action - 20 mm Conduit 111.4mm 40mm
RS庫存編號 808-6800
製造零件編號1LS19
BrandHoneywell
TWD4,760.00
單位
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