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.

...
Read more Read less

Filters

Viewing 161 - 180 of 1127 products
Results per page
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. 240-2638
Mfr. Part No.GLEB07C
BrandHoneywell
HK$627.48
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. 843-1279
Mfr. Part No.AT0-11-S-IA/AR
BrandEaton
HK$523.04
Each
units
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS Stock No. 311-2314
Mfr. Part No.GLEC06A1B
BrandHoneywell
HK$580.01
Each
units
Rotary Lever SPDT 2NC IP67 10 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 106.5mm 65mm
RS Stock No. 186-8447
Mfr. Part No.GLEB01D
BrandHoneywell
HK$633.73
Each
units
Roller Lever SPDT NO/NC IP67 6 A Die Cast Zinc 300V 250V - Snap Action GLE PG13.5 Connector 60mm 65mm
RS Stock No. 314-952
Mfr. Part No.LS2D4L
BrandHoneywell
HK$4,793.12
Each
units
Plunger DPDT 2NO/2NC - 10 A Stainless Steel 600V 250V - Snap Action HDLS Conduit 122.96mm 1.875in
RS Stock No. 125-8467
Mfr. Part No.XCKVR54D1H29
HK$1,407.41
Each
units
Crossed Rods Lever 4P 2NC IP65 10 A PBT+PC GF30 FR, Plastic 240V 125V Screw Clamp Slow Break OsiSense XC Screw 200mm 57mm
RS Stock No. 827-9223
Mfr. Part No.DZ-10GW-1B
BrandOmron
HK$286.43
Each
units
Lever DPDT 2NO/2NC IP00 10 A - 250V 250V Screw Snap Action - Screw 49.2mm 17.45mm
RS Stock No. 776-8520
Mfr. Part No.Z15GQ
BrandOmron
HK$119.66
Each
units
Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Solder Snap Action - PCB Pin 49.2mm 47.3mm
RS Stock No. 822-5471
Mfr. Part No.TZ-1GV2
BrandOmron
HK$2,586.58
Each
units
Roller Lever SPDT NO/NC IP00 1 A - 250V 125V M3.5 Snap Action - Screw 49.2mm 21.8mm
RS Stock No. 808-3104
Mfr. Part No.GLAA01A2B
BrandHoneywell
HK$794.83
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm
RS Stock No. 240-2650
Mfr. Part No.GLEB07A1B
BrandHoneywell
HK$666.16
Each
units
Rotary Lever SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLE PG13.5 Connector 106.5mm 65mm
RS Stock No. 609-3840
Mfr. Part No.ZCMD21C12
HK$419.83
Each
units
- DP NO/NC IP66, IP67 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC M12 Connector 59mm 30mm
New
RS Stock No. 189-5280
Mfr. Part No.6083000214
HK$228.80
Each
units
Roller DPST NC/NO IP66, IP67 5 A Glass Fibre Reinforced Thermoplastic 240V 24V Screw Slow Action, Snap Action IN65 - 31mm 74mm
RS Stock No. 186-8548
Mfr. Part No.GLFC01C
BrandHoneywell
HK$955.13
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 250V 250V - Snap Action GLF 20 mm Conduit 145.8mm 42mm
RS Stock No. 609-3755
Mfr. Part No.ZCKJ404
HK$706.57
Each
units
- DP 2NO/2NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 609-6596
Mfr. Part No.XCKML121
HK$1,273.96
Each
units
Plunger 4P NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 81mm 72mm
RS Stock No. 447-3468
Mfr. Part No.XCKD2118P16
HK$251.37
Each
units
Lever DP NO/NC - 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
New
RS Stock No. 195-1712
Mfr. Part No.XCMN2106L1
HK$318.15
Each
units
Spring Return DPST 1NC/1NO IP65 1.5 A Plastic 240V 250V Cable Snap Action XCMN - 30mm 16mm
RS Stock No. 133-0060
Mfr. Part No.XCSM4102L2
HK$598.91
Each
units
Roller Plunger 4P 2NO/2NC IP66, IP67, IP68 - Zamak - - Pre-Cabled - XCSM - 30mm 16mm
RS Stock No. 609-6524
Mfr. Part No.XCKL102
HK$686.40
Each
units
Plunger SPDT NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 72mm 52mm
Related Products
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...