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 243-780
製造零件編號XCKS102H29
HK$369.95
單位
Plunger DP NO/NC IP65 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm
RS庫存編號 700-4181
製造零件編號ZCT21G11
HK$144.00
單位
- DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS庫存編號 386-0366
製造零件編號Z15GQ22B
BrandOmron
HK$126.94
單位
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS庫存編號 691-7257
製造零件編號LSA1A
BrandHoneywell
HK$1,080.05
單位
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS Conduit 106.78mm 1.62in
RS庫存編號 822-5617
製造零件編號Z-15GW22-B7-K
BrandOmron
HK$87.34
單位
Roller Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V M4 Snap Action - Screw 49.2mm 29.4mm
RS庫存編號 246-3122
製造零件編號6LS1-4C
BrandHoneywell
HK$1,754.96
單位
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit 116.6mm 48.8mm
RS庫存編號 295-4870
製造零件編號8LS1-4C
BrandHoneywell
HK$822.02
單位
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit - -
RS庫存編號 808-3107
製造零件編號GLAA01B
BrandHoneywell
HK$610.73
單位
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm
RS庫存編號 902-6916
BrandRS PRO
HK$166.23
單位
Adjustable Lever DPST NO/NC IP66 10 A Zinc Alloy 400V 250V Cable Snap - Screw 30.3mm 232.5mm
RS庫存編號 828-1018
製造零件編號WL-CA2-7GN
BrandOmron
HK$597.85
單位
Roller Lever DPDT 2NO/2NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 137mm 40mm
RS庫存編號 808-7632
製造零件編號EXD-Q-3
BrandHoneywell
HK$2,355.99
單位
Plunger DPDT 2NO/2NC - 10 A Aluminium 250V 250V - Snap Action - Wire Lead 92.96mm 65.02mm
RS庫存編號 230-1866
製造零件編號XCKS102
HK$340.00
單位
Plunger DP NO/NC IP65 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm
RS庫存編號 700-4210
製造零件編號ZCKM5
HK$242.25
單位
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Slow Action OsiSense XC Wire Lead 64mm 58.5mm
RS庫存編號 478-1359
製造零件編號LSM-02
BrandEaton
HK$218.50
單位
Plunger - 2NC IP66, IP67 6 A Metal 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS庫存編號 435-0321
製造零件編號ZC-Q55
BrandOmron
HK$238.99
單位
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 60.2mm 70mm
RS庫存編號 308-1888
製造零件編號GLDB01A1A
BrandHoneywell
HK$251.43
單位
Roller Lever SPDT 1NO/1NC NO/NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Snap Action GLD PG13.5 Conduit 68.5mm 30.5mm
RS庫存編號 908-3278
製造零件編號WLNJ-Y-N
BrandOmron
HK$396.44
單位
Coil Spring SPST NO/NC IP67 10 A - 500V 250V M20 Snap Action WL Screw 40mm 42mm
RS庫存編號 230-1923
製造零件編號XCKM110
HK$292.25
單位
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS庫存編號 240-2515
製造零件編號GLAC07A1B
BrandHoneywell
HK$801.79
單位
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS庫存編號 828-1014
製造零件編號WL-CA2GN
BrandOmron
HK$447.59
單位
Roller Lever DPDT NO/NC IP67 2 A Aluminium Alloy, Stainless Steel 250V 48V G1/2 Conduit Double Break WL Screw 125mm 40mm