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. 447-3806
Mfr. Part No.ZCMD21
MYR151.76
Each
units
- DP NO/NC - 1.5 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Plug 50mm 30mm
RS Stock No. 684-2910
Mfr. Part No.3SE5112-0CE01
BrandSiemens
MYR199.11
Each
units
Roller Lever - NO/NC IP66, IP67 6 A @ 24 V Metal 400V 400V Snap-On Snap Action - Screw 119mm 37.3mm
RS Stock No. 360-8584
Mfr. Part No.ZCKM1
MYR235.74
Each
units
- DP NO/NC IP66 10 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Wire Lead 64mm 58.5mm
RS Stock No. 308-272
Mfr. Part No.LS-11S
BrandEaton
MYR97.49
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 700-4267
Mfr. Part No.XCKP2118G11
MYR141.24
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 776-8560
Mfr. Part No.Z-15GW-B
BrandOmron
MYR56.34
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 295-4870
Mfr. Part No.8LS1-4C
BrandHoneywell
MYR436.51
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit - -
RS Stock No. 308-266
Mfr. Part No.LS-11
BrandEaton
MYR101.97
Each
units
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS Stock No. 308-1894
Mfr. Part No.GLDB01E7B
BrandHoneywell
MYR149.03
Each
units
Coil Spring 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. 822-5620
Mfr. Part No.Z-15HW24-B7-K
BrandOmron
MYR61.99
Each
units
Lever SPDT NO/NC IP00 15 A - 500V 250V M4 Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 609-6675
Mfr. Part No.XCRF17
MYR958.42
Each
units
Lever 4P 2NO/2NC IP54 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 95mm 85mm
RS Stock No. 894-3340
Mfr. Part No.NGCPB10AX01B
BrandHoneywell
MYR105.56
Each
units
Plunger SPDT NO/NC IP67 6 A Plastic 240V - M12 Positive Break, Snap Action NGC Cable 30mm 16.7mm
RS Stock No. 342-382
Mfr. Part No.WLD2-G
BrandOmron
MYR408.11
Each
units
Roller Lever SPDT NO/NC IP67 10 A @ 250 V ac Die Cast Aluminium 600V 250V Snap-On Snap Action WL Conduit 96.7mm 40mm
RS Stock No. 311-2285
Mfr. Part No.GLDB06B
BrandHoneywell
MYR123.39
Each
units
Plunger DPST 2NC 2NC IP66 10 A Plastic, Polyester 300V 300V Internal Screw Terminal Contact Block Slow Action GLD 20 mm 68.5mm 30.5mm
RS Stock No. 610-0229
Mfr. Part No.ZC2JD1
MYR506.59
Each
units
- SP NO/NC IP65 10 A Metal 240V - - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 776-8567
Mfr. Part No.Z-15GW4-B
BrandOmron
MYR49.60
Each
units
Lever SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V Screw Snap Action - Screw 49.2mm 29.4mm
RS Stock No. 822-5604
Mfr. Part No.Z-15GQ-B7-K
BrandOmron
MYR72.88
Each
units
Plunger SPDT NO/NC IP00 15 A Thermosetting Resin 500V 250V M4 Snap Action - Screw 49.2mm 25.5mm
RS Stock No. 308-1816
Mfr. Part No.GLCB01C
BrandHoneywell
MYR207.34
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
RS Stock No. 447-3468
Mfr. Part No.XCKD2118P16
MYR176.15
Each
units
Lever DP NO/NC - 3 A Zinc Alloy 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 808-7651
Mfr. Part No.GLLA01B
BrandHoneywell
MYR71.22
Each
units
Plunger SPDT NO/NC IP66 10 A Plastic 300V 250V 1/2 in Conduit Snap Action GLL - 30.5mm 62mm
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