QOU350 - 50 Amp Circuit Breaker

QOU350 - 50 Amp Circuit Breaker

Some electrical installations need a breaker that mounts directly into an equipment enclosure rather than a traditional load center. The Square D QOU350 50 Amp 3-Pole Circuit Breaker is built for those applications. Part of Schneider Electric's QOU series, this miniature molded case circuit breaker provides overcurrent protection for compatible residential and commercial electrical systems. If the breaker trips, you get a visual indication of which circuit has been interrupted instead of having to check each breaker individually. Whether you're replacing an existing QOU350 or putting together a compatible electrical assembly, these features make installation and future troubleshooting more straightforward.

Key Features and Benefits

• 50-Amp, Three-Pole Design: Provides overcurrent protection for compatible circuits that require a 50A, three-pole breaker.
• Thermal-Magnetic Protection: Responds to overloads and short circuits to help protect wiring and connected equipment.
• VisiTrip Indicator: Makes it easier to spot a tripped breaker when checking equipment or troubleshooting a circuit.
• Flexible Mounting: Supports DIN rail, surface-mounted, and flush-mounted installations with the appropriate mounting hardware.
• Copper or Aluminum Connections: Slotted box lugs on both ends accept approved conductors ranging from 14 AWG to 2 AWG.
• AC and DC Operational Voltage Ratings: Rated for 120V AC, 120/240V AC, 240V AC, and 48V DC applications, subject to the electrical requirements of the installation.

Technical Specifications

• Manufacturer: Schneider Electric
  
• Brand: Square D
  
• Catalog Number: QOU350
  
• Product Series: QOU
  
• Product Type: Miniature molded case circuit breaker
  
• Circuit Breaker Type: Standard
  
• Rated Current: 50 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: 48V 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: 14 AWG to 2 AWG
  
• Terminal Tightening Torque: 45 lbf-in (5.08 N·m)
  
• Height: 4.05 inches (102.87 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

Beyond the amperage and voltage ratings, it's worth checking the certifications and wiring requirements before choosing a breaker. Schneider Electric lists the Square D QOU350 with the following certifications and compatibility details:

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

Where It Works Best

• Residential Electrical Equipment
  
• Commercial Electrical Installations
  
• 50-Amp Three-Pole AC 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
  
• Existing Square D QOU350 Replacements