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. 742-8711
Mfr. Part No.XCE145
PHP1,040.00
Each
units
Roller Lever SP NO/NC IP65 1.5 A ac, 100 mA dc - 240V 250V - - OsiSense XC Screw 68.5mm 28mm
RS Stock No. 360-8708
Mfr. Part No.XESP2021
PHP1,458.82
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- - 2NO/2NC - 10 A - 600V - - Snap Action OsiSense XC Screw - -
RS Stock No. 323-9475
Mfr. Part No.XY2CD111
PHP4,818.57
Each
units
Eyelet-pull Operating Head - NO/NC IP66 10 A - 240V - - - OsiSense XC Screw 62mm 60mm
RS Stock No. 360-8893
Mfr. Part No.9007MS04S0100
PHP4,630.33
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Lever SPDT NO/NC IP67 10 A Die Cast Zinc 240V 28V - Snap Action 9007 Wire Lead 63.25mm -
RS Stock No. 609-6899
Mfr. Part No.XF9D251
PHP38,475.09
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- 4P - IP54 50 A Aluminium Alloy - - - Snap Action - Wire Lead - -
RS Stock No. 418-6114
Mfr. Part No.XESP2051
PHP472.39
Each
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- - - - 10 A - 600V - - - OsiSense XC - - -
RS Stock No. 360-8685
Mfr. Part No.XE2SP2151
PHP994.98
Each
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- DP NO/NC - 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS Stock No. 609-6798
Mfr. Part No.XE2NP2151
PHP644.52
Each
units
- DP NO/NC - 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS Stock No. 425-2693
Mfr. Part No.XE2SP2141
PHP919.62
Each
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- DP 2NC - 3 A Plastic 240V 250V - Snap Action OsiSense XC Screw - -
RS Stock No. 199-327
Mfr. Part No.XESP2151L
PHP1,040.90
Each
units
- DP NO/NC - 10 A - 240V 250V - Snap Action OsiSense XC Screw - -