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. 311-2465
Mfr. Part No.GLAB20B
BrandHoneywell
$116.53
Each
units
Plunger DPDT 2NO/2NC IP67 6 A Die Cast Zinc 600V 250V - Snap Action GLA PG13.5 Connector 145.8mm 42mm
RS Stock No. 293-7033
Mfr. Part No.3LS1-4C
BrandHoneywell
$361.78
Each
units
Plunger SPDT NO/NC IP67 10 A Die Cast Zinc 480V 550V - Snap Action - Conduit - -
RS Stock No. 447-3452
Mfr. Part No.XCKP2145P16
$145.75
Each
units
Lever DP NO/NC IP66, IP67 10 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 732-2745
Mfr. Part No.XCJ127
$58.21
Each
units
Plunger SPDT NO/NC IP54 10 A - 250V - - - - Screw 63.5mm 70.5mm
RS Stock No. 691-7162
Mfr. Part No.91MCE3-P1
BrandHoneywell
$70.21
Each
units
Plunger - NO/NC IP67 10 A Die Cast Zinc 300V 250V - Snap Action 91MCE Wire Lead 50mm 30mm
RS Stock No. 821-1390
Mfr. Part No.SZL-WLC-B-N
BrandHoneywell
$215.68
Each
units
Rotary Lever SPDT - IP67 6 A Die Cast Aluminium - 24V - Double Break SZL-WL PF1/2 94.1mm 40mm
RS Stock No. 386-0366
Mfr. Part No.Z15GQ22B
BrandOmron
$48.96
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 58.9mm 49.2mm
RS Stock No. 360-8685
Mfr. Part No.XE2SP2151
$53.13
Each
units
- DP NO/NC - 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS Stock No. 691-7207
Mfr. Part No.BZ-2RW8225551-A2
BrandHoneywell
$21.73
Each
units
Roller Lever SPDT - - 15 A Plastic 250V - - Snap Action BZ Screw 41.14mm 1.94in
RS Stock No. 360-8427
Mfr. Part No.ZCKJ1H29
$124.85
Each
units
- DP NO/NC IP65 10 A Metal 240V 250V - Snap Action OsiSense XC Screw 77mm 40mm
RS Stock No. 386-0372
Mfr. Part No.Z15GQB
BrandOmron
$33.83
Each
units
Plunger SPDT NO/NC IP00 15 A - 500V 250V - Snap Action - Screw 47.3mm 49.2mm
RS Stock No. 447-3575
Mfr. Part No.ZCP21
$61.10
Each
units
- DP NO/NC - 1.5 A Plastic 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 123-4593
Mfr. Part No.XCKW141
$180.49
Each
units
Adjustable Roller Lever - - IP66, IP67 - Plastic - - - Snap Action OsiSense XC Screw 40mm 58.7mm
RS Stock No. 308-1894
Mfr. Part No.GLDB01E7B
BrandHoneywell
$65.96
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. 814-8535
Mfr. Part No.9007AO2
$89.34
Each
units
Plunger SPST NO/NC IP20 15 A Plastic 600V - Cable Snap Action 9007 Screw 63.5mm 29mm
RS Stock No. 902-6865
BrandRS PRO
$33.01
Each
units
Adjustable Lever DPST NO/NC IP65 10 A Thermoplastic Fibreglass 400V 250V Cable Snap - Screw 30.3mm 170.5mm
RS Stock No. 447-3604
Mfr. Part No.ZCD21
$89.34
Each
units
- DP NO/NC - 1.5 A Metal 240V 250V - Snap Action OsiSense XC Screw 65mm 31mm
RS Stock No. 230-1850
Mfr. Part No.XCKS101
$60.31
Each
units
Plunger DP NO/NC IP65 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw 72.5mm 40mm
RS Stock No. 470-4403
Mfr. Part No.ZS 236-11Z
BrandSchmersal
$55.41
Each
units
Plunger - NO/NC IP67 10 A Thermoplastic 230V 24V - Snap Action - Screw 61.5mm 30mm
RS Stock No. 894-3346
Mfr. Part No.NGCPB10AX01A1A
BrandHoneywell
$40.40
Each
units
Rotary Lever SPDT NO/NC IP67 6 A Plastic 240V - M12 Positive Break, Snap Action NGC Cable 30mm 32.5mm
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