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Square D QO390 - 3-Pole Circuit Breaker 90A 240V

Square D
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Square D QO390 is a three-pole molded case circuit breaker designed to provide reliable overcurrent protection for three-phase electrical systems. It features a 90A current rating and a 240V AC voltage rating, housed within a compact 89 mm x 57 mm x 74 mm (HxWxD) plug-in unit weighing 1.049 lb. This thermal-magnetic breaker, with a 10kA interrupting rating at 240V, is CSA certified, UL Listed, and HACR approved for use in heating, air conditioning, and refrigeration equipment. It is engineered for installation in QO load centers and NQ panelboards, accepting wire sizes from 8 AWG to 2 AWG via its lug terminals and operating within a temperature range of 40°C (104°F).

Key Features & Specifications
  • Type: Three-pole, plug-in, thermal-magnetic molded case circuit breaker
  • Voltage Rating: 240V AC
  • Current Rating: 90A
  • Dimensions: 3.5 in (89 mm) H x 2.2 in (57 mm) W x 2.9 in (74 mm) D
  • Standards: CSA Certified, HACR, UL Listed
  • Applications: Three-phase branch circuit protection in QO load centers and NQ panelboards
  • Switch Type: Circuit Breaker
  • Configuration: Plug-In
  • Temp Rating: 40°C (104°F) minimum and maximum operating temperature
  • Phase: 3
  • AIC Rating: 10kA @ 240V
  • Connection: Plug-In, Lug Terminal
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: Long-Time and Instantaneous (LI)
  • Frame Size: 100A/QO
  • Panel Type: QO Load Centers and NQ Panelboards
  • Breaker Type: Standard
  • MCM Size: Min. Wire Size 8 AWG, Max. Wire Size 2 AWG
  • Wire Size: 4 to 2/0 AWG (Aluminum/Copper)
  • Certification: HACR, UL Listed


Product Identification
  • UPC: 785901004400
  • GTIN: 00785901004400