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 Stock No. 308-1816
Mfr. Part No.GLCB01C
BrandHoneywell
TWD1,412.00
Each
units
Roller Plunger 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
New
RS Stock No. 210-4465
Mfr. Part No.3SF1324-1SD21-1BA1
BrandSiemens
TWD13,106.00
Each
units
- - 2NC/1NO - - Plastic - - - - 3SF13 - - -
RS Stock No. 814-7964
Mfr. Part No.XCSM3715L2
TWD7,037.00
Each
units
Roller Lever 3P NO/2NC IP66, IP67, IP68 - Metal - - Pre-Cabled - XCSM - 30mm 32.4mm
RS Stock No. 223-3202
Mfr. Part No.GLEB24D
BrandHoneywell
TWD3,734.00
Each
units
Roller Lever DPDT 2NO/2NC IP66 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 99.25mm 65mm
RS Stock No. 123-6419
Mfr. Part No.176879 & LS-11-CC
BrandEaton
TWD1,180.00
Each
units
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Cage Clamp Snap Action LS-Titan - 31mm 33.5mm
RS Stock No. 186-8419
Mfr. Part No.GLEB01B
BrandHoneywell
TWD1,972.00
Each
units
Plunger SPDT NO/NC IP67 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 60mm 65mm
RS Stock No. 189-5293
Mfr. Part No.6083000243
TWD1,186.00
Each
units
Roller DPST NC/NO IP66, IP67 5 A Glass Fibre Reinforced Thermoplastic 240V 24V Screw Slow Action, Snap Action I81 - 31mm 101mm
RS Stock No. 133-0058
Mfr. Part No.XCSPL962
TWD2,027.00
Each
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Straight Lever 3P NO/2NC IP67 - Nylon 66, Plastic - - M16 - XCSPL - 30mm 30mm
RS Stock No. 894-3384
Mfr. Part No.NGCMC50AX32A1A
BrandHoneywell
TWD1,993.00
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 mA Metal - 0.03V M12 Positive Break, Snap Action NGC Cable 30mm 32.5mm
RS Stock No. 189-5295
Mfr. Part No.6083000245
TWD1,186.00
Each
units
Lever, Roller DPST NC/NO IP66, IP67 5 A Glass Fibre Reinforced Thermoplastic 240V 24V Screw Slow Action, Snap Action I81 - 31mm 121mm
New
RS Stock No. 215-1449
Mfr. Part No.D4C-1250
BrandOmron
TWD2,694.00
Each
units
Plastic Rod SPDT - IP67 5 A - 250V - - - - - - -
RS Stock No. 207-1981
Mfr. Part No.GLBC02A4J
BrandHoneywell
TWD4,045.00
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action GLB 20 mm Conduit 145.8mm 42mm
RS Stock No. 311-2392
Mfr. Part No.GLAB01E7B
BrandHoneywell
TWD3,110.00
Each
units
Coil Spring SPDT NO/NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 240-2622
Mfr. Part No.GLEB07B
BrandHoneywell
TWD2,405.00
Each
units
Plunger SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLE PG13.5 Connector 60mm 65mm
RS Stock No. 691-7184
Mfr. Part No.BZ-2R244-A2
BrandHoneywell
TWD780.00
Each
units
Plunger SPDT - - 5 A Plastic 250V - - Snap Action BZ Screw 24.13mm 1.94in
New
RS Stock No. 217-7111
Mfr. Part No.1LS3-4PG
BrandHoneywell
TWD5,922.00
Each
units
Side Rotary SPDT 1NC/1NO IP67 10 A - - - - - - - - -
RS Stock No. 755-7862
Mfr. Part No.3SE5413-0CC22-1EA2
BrandSiemens
TWD2,477.00
Each
units
Round Plunger DPST NO/NC - - - - - Cable - 3SE5 - 50mm 30mm
RS Stock No. 360-8449
Mfr. Part No.ZCKJ121H29
TWD2,225.00
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 81.5mm 44mm
RS Stock No. 447-3856
Mfr. Part No.XCMD2145L1
TWD3,111.00
Each
units
Lever DP NO/NC IP66, IP67, IP68 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 50mm 30mm
RS Stock No. 827-9087
Mfr. Part No.A-20GV2-B
BrandOmron
TWD542.00
Each
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Roller Lever SPDT NO/NC IP00 20 A - 500V 250V Screw Snap Action - Screw 49.2mm 17.45mm