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United Electric 100 Series H100-174 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
  • Welded 316L stainless steel diaphragm and 1/2” NPT (female) pressure connection
  • Large 0.72” orifice for clean-out purposes (NACE MR0175 compliant)
  • Adjustable Set Point Range: 8 to 200 psi (0,6 to 13,8 bar)
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