703-U/703-UJ Series Pressure Switches


Suitable for gaseous or liquid fluid systems in hazardous applications, the 703-U and 703-UJ Series of UL-rated, explosion-proof pressure switches have a corrosion-resistant stainless steel construction and UL ratings for hazardous locations, including Class 1: Division 1; Groups A, B, C, D; as well as Class 2: Groups E, F, G.


Units also feature high overpressure capabilities, a NEMA Type 7 explosion-proof rating, and a rugged piston design, enabling these switches to withstand high-pressure spikes, shock, and vibration. The 703-U Series features factory-set fixed pressure, while the 703-UJ features field-adjustable pressure. Designed for easy field adjustment, the 703-UJ also incorporates a tamper-resistant locking mechanism to maintain set point integrity.


Thanks to their durable construction, 703-U/UJ pressure switches boast accuracy and repeatability even in explosive environments. They also guarantee a long service life, thanks to a snap-action electrical switch tested to 1 million cycles.


  • Pressure range: 6 to 5,000 PSI
  • Temperature range: -40° to +180°F
  • Pressure connection: 1/4 to 18 NPT (male) and 1/2 to 14 in. NPT (male)
  • Single pole double throw (SPDT) option
  • Double pole double throw (DPDT) option
  • 1/2-in. NPT electrical connection with five full threads for conduit engagement
  • Factory-sealed lead wires — Type UL 1015 AWG #18, 24 in. long
  • Hydraulic and electric modules AISI 316 stainless steel


  • Off-shore exploration
  • Petrochemical processing
  • Industrial OEM equipment
  • Oil and Gas, Pipelines
  • Control Panels
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