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 258-8215
製造零件編號GSAC20D
BrandHoneywell
HK$1,275.40
單位
Roller Arm 4P 2NO/2NC - - Metal - - Screw - GSS - 141mm 42mm
RS庫存編號 821-0381
製造零件編號BZE7-2RQ8-PG
BrandHoneywell
HK$1,701.64
單位
Roller Plunger SPDT NO/NC IP50 15 A Die Cast Aluminium 125 V, 250 V, 480 V 125 V, 250 V PG 13.5 Snap Action - PG13.5 - -
RS庫存編號 132-9181
製造零件編號XCSPL562
HK$460.36
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Straight Lever DP NC/NO IP67 - Nylon 66, Plastic - - M16 - XCSPL - 30mm 103mm
RS庫存編號 447-3496
製造零件編號XCKD2121P16
HK$932.09
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Plunger DP NO/NC IP66, IP67 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 73mm 30mm
RS庫存編號 766-1624
製造零件編號XCSD3910P20
HK$316.25
單位
Plunger 3P NO/2NC - - Metal - - M20 - XCSD - 89mm 34mm
RS庫存編號 691-7200
製造零件編號BZ-2RW82255-A2-S
BrandHoneywell
HK$304.50
單位
Roller Lever SPDT - - 15 A Plastic 250V - - Snap Action BZ Screw 41.14mm 1.94in
RS庫存編號 195-1668
製造零件編號XCKJ167D
HK$2,476.48
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Roller Plunger DPST 1NC/1NO IP66 3 A Zamak 50V 50V M12 Snap Action XCKJ - 40mm 44mm
RS庫存編號 189-5294
製造零件編號6083000244
HK$285.93
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Lever, Roller DPST NC/NO IP66, IP67 5 A Glass Fibre Reinforced Thermoplastic 240V 24V Screw Slow Action, Snap Action I81 - 31mm 105.5mm
RS庫存編號 230-1967
製造零件編號XCKM115
HK$1,124.49
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Lever DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS庫存編號 195-1695
製造零件編號XCMD2110L2
HK$755.50
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Plunger DPST 1NC/1NO IP66, IP67, IP68 1.5 A Zamak 240V 250V Cable Snap Action XCMD - 30mm 16mm
RS庫存編號 195-1710
製造零件編號XCMN2102L5
HK$680.62
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Roller Plunger DPST 1NC/1NO IP65 1.5 A Plastic 240V 250V Cable Snap Action XCMN - 30mm 16mm
RS庫存編號 136-3200
製造零件編號6089102049
HK$319.07
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Plunger SPST NO/NC IP67 - Polymeric - - Cable - I49 - 30mm 16mm
RS庫存編號 203-3887
製造零件編號3SE5232-0LK21
BrandSiemens
HK$376.88
單位
Roller - 1 NO/2 NC IP65 6 A Plastic 400V - - Snap Action - - - -
RS庫存編號 125-8471
製造零件編號XCMN2110L1
HK$230.09
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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 902-6938
BrandRS PRO
HK$280.86
單位
Plunger DPST NO/NC IP67 5 A Die Cast Zinc Alloy, Thermoplastic 240V 250V Cable Snap - Wire Lead 31.5mm 74mm
RS庫存編號 308-1945
製造零件編號GLCB07A1B
BrandHoneywell
HK$530.91
單位
Roller Lever SPDT 1NO/1NC Gold Contacts NO/NC IP66 100 mA Die Cast Zinc 50V 50V Internal Screw Terminal Contact Block Snap Action GLC PG13.5 Conduit 68.5mm 30.5mm
RS庫存編號 822-5620
製造零件編號Z-15HW24-B7-K
BrandOmron
HK$173.24
單位
Lever SPDT NO/NC IP00 15 A - 500V 250V M4 Snap Action - Screw 49.2mm 29.4mm
RS庫存編號 843-1207
製造零件編號005244 & AT4/11-1/I/S
BrandEaton
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單位
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS庫存編號 609-6798
製造零件編號XE2NP2151
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- DP NO/NC - 3 A Plastic 240V 250V - Slow Break OsiSense XC Screw - -
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BrandOmron
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單位
Coil Spring SPDT NO/NC IP62 15 A Thermosetting Resin 250V 250V Screw Snap Action - Screw 49.2mm 111.3mm