Float Switches

Our Bulletin 840 Float Switches are heavy-duty industrial control devices. They open and close contacts in response to changes in liquid level. These switches are available in five different styles with both motor and pilot duty contact ratings.

Popular Resources/Quicklinks
Condition Sensing Technical Data Bulletin 840 Float Switch Installation Instructions


  • Contact ratings NEMA A600 and N300
  • Operating sensitivity from 2...5 in.
  • Most models can be converted between tank and sump operation
  • Eleven standard float switch operator assemblies available
  • Rods, floats and cables are stainless steel
  • Available in Type 1, 4 and 7/9 enclosures

Float Switches

Product Selection

  • CE Marked for all applicable directives 
  • CSA Certified
  • UL Listed
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Resource Publication Number Language
Condition Sensing Technical Data 836-TD001
Bulletin 840 Float Switch Installation Instructions 840-IN001
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Typical applications for Bulletin 840 Float Switches include:

  • Storage tanks
  • Water treatment plants
  • Water/waste water treatment plants

Essential Components Case Studies — View our case studies site to discover how customers have applied Allen-Bradley components in their applications.

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