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Square D QO190 - Molded Case 90A 1-Pole 240V Breaker

Square D
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Square D QO190 is a 1-pole, 90 amp, 240 volt plug-in molded case circuit breaker designed for branch circuit protection in residential and commercial QO load centers. It provides long-time and instantaneous (LI) protection via a thermal-magnetic trip unit, with a 10kA interrupting rating at 240V for reliable fault clearing. The unit weighs 1 lb and features a plug-in connection for straightforward installation in compatible QO panels. This breaker complies with UL 489 standards for safety and performance, operating at 60 Hz (50 Hz compatible). It is typically used for branch circuit protection in Square D QO load centers.

Key Features & Specifications
  • Manufacturer: Square D
  • Item Subcategory: Molded Case
  • Family: QO Series
  • Type: QO
  • Weight: 1 lb
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 240V
  • Poles: 1
  • Connection: Plug-In
  • Protection: Thermal Magnetic
  • AIC rating: 10kA@240V
  • Phase: 1
  • Current Rating: 90A
  • Amperage: 90A
  • Mounting Type: Plug-In
  • Interrupt Rating: 10kA @ 240V
  • Series/Frame: QO
  • Frame Size: Standard
  • Trip Unit: Thermal-Magnetic
  • Certifications: UL 489
  • Application: Branch Circuit Protection
  • Mounting Compatibility: QO Load Centers
  • Operating Frequency: 60 Hz (50 Hz compatible)