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United Electric 100 Series H100-702-M444-1537 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 O-ring with nickel-plated brass 1/4” NPT (female) pressure connection (Viton® diaphragm and O-ring available)
  • Adjustable Set Point Range: 3 to 100 psi (0,2 to 6,9 bar)
  • Paper ID tag
  • Vapor sealed switch, 15 A 125/250 VAC resistive. All switches have limited DC capabilities. Consult factory for details.
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