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United Electric 100 Series H100K-545 Differential Pressure Switch

The 100 Series is a cost-effective pressure switch for process plants and OEM equipment. The rugged, one piece enclosure features a slanted cover for wiring accessibility. A wide variety of microswitch and process-connection options make this versatile series ideal for applications requiring a rugged weather-proof mechanical switch.

Typical applications that utilise the 100 Series are heat tracing, freeze protection, processing equipment (pumps, compressors), inputs for annunciator panels, and fire suppression systems.


  • Safe area switch
  • One SPDT output; epoxy coated enclosure; internal adjustment with “High-Low” reference scale
  • Enclosure: Die cast aluminum, epoxy powder coated, gasketed, captive cover screws
  • Electrical Connection: 1/2” NPT (female); Two 7/8” diameter knockouts
  • Buna N diaphragm and sealing diaphragms with epoxy coated aluminum 1/8” NPT (female) pressure connections
  • Adjustable Set Point Range: 5 to 50 psid (0,3 to 3,4 bar)
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