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 396-2529
製造零件編號GXA51A2B
BrandHoneywell
HK$2,263.68
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 293-7055
製造零件編號GLAC01A2W
BrandHoneywell
HK$874.67
單位
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS庫存編號 613-8218
製造零件編號07-1501-6530/01
BrandBartec
HK$956.82
單位
Plunger - NO/NC IP54 5 A Duroplast 250V 250V - - - Screw 29.8mm 18mm
RS庫存編號 280-8799
製造零件編號XCKM106
HK$401.18
單位
Coil Spring DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS庫存編號 753-0003
製造零件編號D4MC-5020
BrandOmron
HK$224.92
單位
Roller Plunger SPDT NO/NC IP67 3 A ac, 250 mA dc - 480V 250V Screw Snap Action - Screw 70mm 47mm
RS庫存編號 700-4305
製造零件編號XCKJ10511H29
HK$691.60
單位
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS庫存編號 776-8523
製造零件編號Z15GM2B
BrandOmron
HK$90.86
單位
Roller Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 39.4mm
RS庫存編號 311-2459
製造零件編號GLAB20A1B
BrandHoneywell
HK$915.16
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 308-1822
製造零件編號GLCB01A1A
BrandHoneywell
HK$322.15
單位
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庫存編號 308-1951
製造零件編號GLCB07A2B
BrandHoneywell
HK$445.58
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 396-2541
製造零件編號GXA51C
BrandHoneywell
HK$1,855.15
單位
Plunger SPDT NO/NC IP66, IP67 4 A Die Cast Zinc 250V - - Snap Action GXA Wire Lead 102.9mm 42mm
RS庫存編號 199-282
製造零件編號XC2JC10111
HK$1,102.00
單位
Rotary Lever - - IP65 10 A Metal 240V - - Snap Action OsiSense XC Wire Lead 81mm 41mm
RS庫存編號 843-1213
製造零件編號AT4/11-S/I/AR
BrandEaton
HK$662.84
單位
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT4 Screw - -
RS庫存編號 447-3575
製造零件編號ZCP21
HK$103.72
單位
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS庫存編號 828-1027
製造零件編號WL-CA12-GN
BrandOmron
HK$534.78
單位
Adjustable Roller Lever DPST NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 94.1mm 40mm
RS庫存編號 339-421
製造零件編號14CE2-1
BrandHoneywell
HK$596.95
單位
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm
RS庫存編號 236-007
製造零件編號XCKM115H29
HK$326.10
單位
Lever DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS庫存編號 808-2754
製造零件編號BZE6-2RN2
BrandHoneywell
HK$741.24
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 186-8469
製造零件編號GLEB01A2B
BrandHoneywell
HK$395.17
單位
Rotary Lever SPDT NO/NC IP67 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 139mm 65mm
RS庫存編號 246-3087
製造零件編號14CE2-3
BrandHoneywell
HK$694.08
單位
Roller Plunger SPDT NO/NC IP66 5 A Die Cast Zinc 240V - - Snap Action 14CE Wire Lead 49mm 40mm