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 894-3343
製造零件編號NGCPA10AX01L
BrandHoneywell
HK$239.26
單位
Roller Plunger SPDT NO/NC IP67 6 A Plastic 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
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製造零件編號TZ-1GV22
BrandOmron
HK$2,786.81
單位
Roller Lever SPDT NO/NC IP00 1 A - 250V 125V M3.5 Snap Action - Screw 49.2mm 21.8mm
RS庫存編號 136-5913
製造零件編號Ex 14 RUV 2O-5m
BrandSteute
HK$1,182.86
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Emergency-Stop Push-Button DPST 2NC IP65 6 A @ 250 V ac, 250 mA @ 230 V dc Glass-Fibre, Thermoplastic 250V 230V Cable Positive Break, Slow Action Ex 14 - - 1778mm
RS庫存編號 908-3253
製造零件編號WLCA2-Y-N
BrandOmron
HK$476.36
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Roller Lever SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 60mm
RS庫存編號 691-7204
製造零件編號BZ-2RW82272-A2
BrandHoneywell
HK$338.78
單位
Roller Lever SPDT - - 1 A Plastic 125V - - Snap Action BZ Screw 41.14mm 1.94in
RS庫存編號 199-018
製造零件編號AZ8107CEJ
BrandPanasonic
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Coil Spring DPST NO/NC IP64 5 A - 250V 125V - - AZ8 Screw 96.5mm 28mm
RS庫存編號 179-9871
製造零件編號XCKVR44D1H29
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Stay Put Crossed Rods Lever Metal 4P 2 x (1NC/1NO) IP65 3 A (PBT+PC)-GF30 FR 240V 125V Screw Slow Break OsiSense XC Screw 200mm 57mm
RS庫存編號 691-7229
製造零件編號BZ-R-A2
BrandHoneywell
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Plunger SPDT - - 15 A Plastic 250V - - Snap Action BZ Screw 24.13mm 1.94in
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BrandHoneywell
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Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 240V - Cable Snap Action 14CE, 914CE Wire Lead 40mm 16mm
RS庫存編號 362-3167
製造零件編號14CE1-1H
BrandHoneywell
HK$622.98
單位
Plunger - NO/NC IP65 3 A - 240V 1500V - - 14CE Wire Lead 49mm 40mm
RS庫存編號 894-3302
製造零件編號NGCMA10AX01B
BrandHoneywell
HK$255.58
單位
Plunger SPDT NO/NC IP67 6 A Metal 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS庫存編號 123-6416
製造零件編號LS-S02-CC
BrandEaton
HK$262.16
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Plunger - 2NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Screw Snap Action LS-Titan - 31mm 33.5mm
RS庫存編號 776-8539
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Roller Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 58.9mm
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製造零件編號GLEB07A1B
BrandHoneywell
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Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLE PG13.5 Connector 106.5mm 65mm
RS庫存編號 193-2043
製造零件編號LS4A3K-1B
BrandHoneywell
HK$1,149.57
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Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS 20 mm Conduit 106.7mm 41.1mm
RS庫存編號 808-3135
製造零件編號GLCA01A1B
BrandHoneywell
HK$328.95
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Rotary Lever SPDT NO/NC IP66 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLC Wire Lead 30.5mm 30mm
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Plunger DPST NO/NC IP66, IP67 10 A Plastic 240V - 1/2 NPT Conduit Snap Action OsiSense XC Wire Lead 65mm 31mm
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Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 72mm 52mm