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. 447-3553
Mfr. Part No.XCKT2121P16
MYR220.76
Each
units
Plunger DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 51mm 58mm
RS Stock No. 776-8554
Mfr. Part No.Z-15GW2255-B
BrandOmron
MYR80.54
Each
units
Roller Lever SPDT NO/NC IP62 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 39.4mm
RS Stock No. 386-0417
Mfr. Part No.Z-15GW22B
BrandOmron
MYR54.45
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 386-0423
Mfr. Part No.Z-15GW2BOMI
BrandOmron
MYR52.52
Each
units
Roller Lever SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 39.4mm 49.2mm
RS Stock No. 808-2757
Mfr. Part No.BZE6-2RN
BrandHoneywell
MYR306.37
Each
units
Plunger SPDT NO/NC IP66 15 A Die Cast Zinc 600V 250V 1/2 NPT Snap Action BZE6 Screw 25.4mm 44.4mm
RS Stock No. 435-0343
Mfr. Part No.ZC-Q2255
BrandOmron
MYR181.63
Each
units
Plunger SPDT NO/NC IP67 10 A - 250V 250V - Snap Action - Screw 69.4mm 70mm
RS Stock No. 360-8455
Mfr. Part No.ZCKJ1
MYR227.88
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 308-1888
Mfr. Part No.GLDB01A1A
BrandHoneywell
MYR174.61
Each
units
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 Stock No. 386-0372
Mfr. Part No.Z-15GQB
BrandOmron
MYR73.28
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 47.3mm 49.2mm
RS Stock No. 230-1951
Mfr. Part No.XCKM121
MYR306.22
Each
units
Plunger DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 64mm 63mm
RS Stock No. 386-0366
Mfr. Part No.Z-15GQ22B
BrandOmron
MYR75.12
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 808-2678
Mfr. Part No.914CE2-3A
BrandHoneywell
MYR474.63
Each
units
Roller Plunger SPDT NO/NC IP66, IP67, IP68 5 A Die Cast Zinc 250V 28V Cable Snap Action 914CE Wire Lead 40mm 16mm
RS Stock No. 808-3148
Mfr. Part No.GLCA01A2B
BrandHoneywell
MYR257.22
Each
units
Rotary Lever SPDT NO/NC IP66 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLC Wire Lead 30.5mm 30mm
RS Stock No. 360-8427
Mfr. Part No.ZCKJ1H29
MYR174.16
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 808-3129
Mfr. Part No.GLAA20A2B
BrandHoneywell
MYR669.33
Each
units
Rotary Lever DPDT 2NO/2NC IP67 10 A Die Cast Zinc 600V 250V 1/2 in NPT Conduit Snap Action GLA Wire Lead 42mm 42mm
RS Stock No. 691-7257
Mfr. Part No.LSA1A
BrandHoneywell
MYR729.89
Each
units
Rotary Lever SPDT NO/NC IP67 10 A Die Cast Zinc 600V 250V - Snap Action HDLS Conduit 106.78mm 1.62in
RS Stock No. 470-4403
Mfr. Part No.ZS 236-11Z
BrandSchmersal
MYR160.16
Each
units
Plunger - NO/NC IP67 10 A Thermoplastic 230V 24V - Snap Action - Screw 61.5mm 30mm
RS Stock No. 240-2492
Mfr. Part No.GLAC07B
BrandHoneywell
MYR512.28
Each
units
Plunger SPDT NO/NC IP67 100 mA Die Cast Zinc 50V 50V - Snap Action GLA 20 mm Conduit 145.8mm 42mm
RS Stock No. 235-925
Mfr. Part No.XCKJ161
MYR419.44
Each
units
Plunger SPDT NO/NC IP66 10 A Metal 600V 600V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 757-9216
Mfr. Part No.D4NL-1AFG-B
BrandOmron
MYR1,097.39
Each
units
Various Options - - IP67 - Plastic - - - - D4NL - 95mm 88.5mm