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 360-8584
製造零件編號ZCKM1
HK$214.70
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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 902-6935
BrandRS PRO
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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 447-3575
製造零件編號ZCP21
HK$103.72
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- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
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製造零件編號XCKL115
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Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 72mm 52mm
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
RS庫存編號 828-1027
製造零件編號WL-CA12-GN
BrandOmron
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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
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製造零件編號XE2NP2151
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- DP NO/NC - 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS庫存編號 186-8481
製造零件編號GLEB01E7B
BrandHoneywell
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Coil Spring SPDT NO/NC IP66 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 189mm 65mm
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製造零件編號XCKP2102P16
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Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS庫存編號 235-997
製造零件編號XCKM121H29
HK$375.34
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Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS庫存編號 236-013
製造零件編號XCKM106H29
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Coil Spring DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
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製造零件編號XCKJ10513H29
HK$605.76
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Lever SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
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製造零件編號GXE51B
BrandHoneywell
HK$1,533.79
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Plunger SPDT NO/NC IP67 4 A Die Cast Zinc 240V - - Snap Action GXS Wire Lead 88mm 52mm
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製造零件編號D4E-1A20N
BrandOmron
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Roller Plunger SPDT NO/NC IP67 5 A - 125V - Screw Snap Action - Screw 57mm 32.9mm
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製造零件編號GLCB01E7B
BrandHoneywell
HK$400.00
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Coil Spring 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
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製造零件編號XCMD2102C12
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Roller Plunger DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC M12 Connector 50mm 30mm
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製造零件編號EX-Q
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Plunger SPDT NO/NC - 15 A Aluminium 480V 250V - Snap Action - Conduit 122.17mm 3.66in
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製造零件編號WLD18-Y-N
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Plunger SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 42mm