QOU390 - 90Amp Circuit Breaker

QOU390 - 90Amp Circuit Breaker

When your electrical equipment calls for a 90-amp, three-pole breaker, you need the right balance of circuit protection and mounting flexibility. The Square D QOU390 90 Amp 3-Pole Circuit Breaker is designed for compatible residential and commercial electrical applications where a traditional load center installation may not be the best fit. Manufactured by Schneider Electric, this QOU-series miniature molded case circuit breaker provides thermal-magnetic overcurrent protection, a 10kA AC interrupting rating, and the versatility needed for a variety of electrical equipment configurations.

Key Features and Benefits

• 90-Amp, Three-Pole Design: Provides overcurrent protection for compatible electrical circuits requiring a 90A, three-pole breaker.
• Thermal-Magnetic Protection: Responds to overloads and short circuits, helping protect wiring and connected equipment from excessive current.
• VisiTrip Indicator: Makes a tripped breaker easier to identify, helping reduce guesswork during troubleshooting and maintenance.
• Flexible Mounting: Supports DIN rail, surface-mounted, and flush-mounted installations using the appropriate mounting hardware.
• Copper or Aluminum Connections: Slotted box lugs on both the line and load sides accommodate approved conductors ranging from 12 AWG through 2/0 AWG.
• AC and DC Operational Voltage Ratings: Rated for 120V AC, 120/240V AC, 240V AC, and 60V DC operation, subject to the requirements of the electrical system.

Technical Specifications

• Manufacturer: Schneider Electric
  
• Brand: Square D
  
• Catalog Number: QOU390
  
• Product Series: QOU
  
• Product Type: Miniature Molded Case Circuit Breaker
  
• Circuit Breaker Type: Standard
  
• Rated Current: 90 Amps
  
• Number of Poles: 3
  
• Trip Mechanism: Thermal-Magnetic
  
• Trip Indicator: VisiTrip
  
• Rated AC Voltage: 120V AC / 120/240V AC / 240V AC
  
• Rated DC Voltage: 60V DC
  
• AC Interrupting Rating: 10kA at 120V AC, 120/240V AC, and 240V AC
  
• Mounting Type: Unit Mount
  
• Mounting Options: DIN Rail, Surface, or Flush Mounting with Appropriate Hardware
  
• Line Connection: Slotted Box Lugs
  
• Load Connection: Slotted Box Lugs
  
• Compatible Conductors: Copper and Aluminum
  
• Wire Size Range: 12 AWG to 2/0 AWG
  
• Terminal Tightening Torque: 45 lbf-in (5.08 N·m)
  
• Height: 4.45 inches (113.03 mm)
  
• Width: 2.25 inches (57.15 mm)
  
• Depth: 2.95 inches (74.93 mm)
  
• HACR Rated: Yes
  
• Product Certifications: UL Listed, CSA, IEC (as identified in manufacturer specifications)
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL Listed
• CSA Certification
• IEC Certification
• HACR Rated
• Copper and Aluminum Conductor Compatibility

Where It Works Best

• Residential Electrical Equipment
  
• Commercial Electrical Installations
  
• Compatible 90-Amp Three-Pole Circuits
  
• Electrical Control Panels
  
• Custom Equipment Enclosures
  
• DIN Rail-Mounted Assemblies
  
• Surface-Mounted Electrical Assemblies
  
• Flush-Mounted Electrical Assemblies
  
• Heating and Air Conditioning Equipment
  
• Refrigeration Equipment
  
• Electrical Equipment Maintenance
  
• Compatible Square D QOU390 Replacements