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 757-9216
製造零件編號D4NL-1AFG-B
BrandOmron
HK$1,880.57
單位
Various Options - - IP67 - Plastic - - - - D4NL - 95mm 88.5mm
RS庫存編號 894-3380
製造零件編號NGCMB50AX32L
BrandHoneywell
HK$515.99
單位
Roller Plunger DPDT 2NO/2NC IP67 10 mA Metal - 0.03V M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS庫存編號 195-1753
製造零件編號ZCT27G11
HK$622.95
單位
- 2P 2NC - 1.5 A Plastic 240V 250V PG 11 Slow Break ZCT Screw 30mm 16mm
RS庫存編號 808-2968
製造零件編號LSJ1A-7A
BrandHoneywell
HK$1,195.86
單位
Coil Spring SPDT NO/NC IP65, IP66, IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS Plug In 41.1mm 44.5mm
RS庫存編號 195-1747
製造零件編號ZCMD29L2
HK$694.66
單位
- 2P 2NC - - Zamak - - Cable Snap Action ZCMD - 30mm 16mm
RS庫存編號 195-1772
製造零件編號XCSTE5512
HK$2,496.56
單位
- 2P 1NC/1NO IP67 - Polyamide - - Terminal - XCST - 110mm 33mm
RS庫存編號 311-2229
製造零件編號GLAC06A2B
BrandHoneywell
HK$941.36
單位
Rotary Lever DPST 2NC IP67 10 A Die Cast Zinc 500V 250V - Slow Action GLA 20 mm Conduit 145.8mm 42mm
RS庫存編號 808-2643
製造零件編號914CE1-Q
BrandHoneywell
HK$637.19
單位
Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE M12 Connector 40mm 16mm
RS庫存編號 111-7888
製造零件編號KBC1S11
BrandLovato
HK$201.03
單位
Roller Plunger SPST-NC, SPST-NO NO/NC IP20, IP65 10 A Polymer Thermoplastic 690V - Cable, 1/2 NPT Snap - Screw 30mm 93.5mm
RS庫存編號 125-8471
製造零件編號XCMN2110L1
HK$230.09
單位
Spring Return Plunger DP NO/NC IP65 6 A Plastic 240V 250V Fixed Cable Snap Action OsiSense XC Fixed Cable 30mm 16mm
RS庫存編號 136-5923
製造零件編號Ex ES 98 -11 -40C
BrandSteute
HK$2,723.19
單位
Plunger DPST NO/NC IP66 4.4 (T6) A, 6.6 (T5) A Aluminium 250V 125V Cable Positive Break, Slow Action Ex 98 Screw 1016mm 2768.6mm
RS庫存編號 243-796
製造零件編號ZCKS1H29+ZCK-D06
HK$227.46
單位
Coil Spring DP NO/NC IP65 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm
RS庫存編號 768-6519
製造零件編號3SE5122-0KA00
BrandSiemens
HK$403.87
單位
Round Plunger - NO/2NC - - Metal - - Screw - 3SE5 - 56mm 37.8mm
RS庫存編號 539-214
製造零件編號83874101
BrandCrouzet
HK$552.87
單位
Plunger - NO/NC IP66, IP67 6 A Metal 240V 125V Cable Snap Action - - 74.8mm 30mm
RS庫存編號 382-1119
製造零件編號071687 & ATB11-2
BrandEaton
HK$239.90
單位
- - NO/NC IP65 10 A - 500V 220V - Snap Action - - 59.2mm 30mm
RS庫存編號 894-3324
製造零件編號NGCMB10AX01L
BrandHoneywell
HK$300.27
單位
Roller Plunger SPDT NO/NC IP67 6 A Metal 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS庫存編號 700-4191
製造零件編號ZCMD25L5
HK$878.55
單位
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Slow Action OsiSense XC Wire Lead - -
RS庫存編號 360-8900
製造零件編號9007MS01S0106
HK$670.44
單位
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 240V 28V - Snap Action 9007 Wire Lead 39.6mm 15.87mm
RS庫存編號 136-3191
製造零件編號6086803013
HK$271.13
單位
Plunger DPST 2NC IP65 - Thermoplastic - - Screw - I88 - 31mm 30.5mm
RS庫存編號 136-5919
製造零件編號Ex ES 97 W 11 -60 c
BrandSteute
HK$3,427.04
單位
Plunger with Collar DPST NO/NC IP66, IP67, IP69 4 A Glass-Fibre, Thermoplastic 500V - Cable Positive Break, Slow Action Ex 97 Screw 787.4mm 2057.4mm