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 293-7055
製造零件編號GLAC01A2W
BrandHoneywell
HK$941.36
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 808-2754
製造零件編號BZE6-2RN2
BrandHoneywell
HK$682.76
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$469.74
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 749-7583
製造零件編號3SE5112-0CD02
BrandSiemens
HK$671.73
單位
Plunger DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS庫存編號 609-6552
製造零件編號XCKL115
HK$1,198.46
單位
Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 72mm 52mm
RS庫存編號 334-628
製造零件編號BZE7-2RN-C
BrandHoneywell
HK$909.78
單位
Plunger - - IP65 - - - - - - - Screw - -
RS庫存編號 621-1543
製造零件編號D4N-1132
BrandOmron
HK$196.71
單位
Roller Plunger SPDT NO/NC IP67 - - - - Screw - D4N - 83.6mm 31mm
RS庫存編號 199-282
製造零件編號XC2JC10111
HK$1,078.31
單位
Rotary Lever - - IP65 10 A Metal 240V - - Snap Action OsiSense XC Wire Lead 81mm 41mm
RS庫存編號 843-1288
製造零件編號024205 & AT0-11-S-IA/F
BrandEaton
HK$719.72
單位
Coil Spring - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT0 Screw - -
RS庫存編號 360-8584
製造零件編號ZCKM1
HK$239.16
單位
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 64mm 58.5mm
RS庫存編號 749-7599
製造零件編號3SE5112-0CH50
BrandSiemens
HK$684.19
單位
Twist Lever DPST NO/NC IP66, IP67 6 A Metal - - Screw - 3SE5 Screw 85.7mm 40.5mm
RS庫存編號 902-6935
BrandRS PRO
HK$234.67
單位
Adjustable Lever DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 158mm
RS庫存編號 828-1027
製造零件編號WL-CA12-GN
BrandOmron
HK$549.82
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$861.02
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 246-3087
製造零件編號14CE2-3
BrandHoneywell
HK$757.39
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 447-3806
製造零件編號ZCMD21
HK$490.29
單位
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Plug 50mm 30mm
RS庫存編號 447-3575
製造零件編號ZCP21
HK$299.07
單位
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS庫存編號 843-1213
製造零件編號062197 & AT4/11-S/I/AR
BrandEaton
HK$822.11
單位
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT4 Screw - -
RS庫存編號 396-2541
製造零件編號GXA51C
BrandHoneywell
HK$2,544.29
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 515-662
製造零件編號BZE7-2RQ8-C
BrandHoneywell
HK$1,157.44
單位
Roller Level - - IP50 - - - - - - - Screw - -