QOU340 - 40 Amp Circuit Breaker

QOU340 - 40 Amp Circuit Breaker

When your electrical installation needs three-pole circuit protection without relying on a traditional load center, the right breaker can make all the difference. The Square D QOU340 40 Amp 3-Pole Circuit Breaker is designed for residential and commercial applications that require dependable overcurrent protection and flexible mounting options. Part of Schneider Electric's QOU series, this miniature molded case circuit breaker combines a 40-amp current rating, thermal-magnetic protection, and a 10kA interrupting capacity in a compact, unit-mounted design.

Key Features and Benefits

• 40-Amp, Three-Pole Design: Provides overcurrent protection for compatible electrical circuits requiring a 40A, three-pole circuit breaker.
• Thermal-Magnetic Protection: Responds to overloads and short circuits, helping protect electrical wiring and connected equipment from excessive current.
• VisiTrip Indicator: Makes a tripped breaker easier to identify, helping maintenance personnel locate affected circuits and begin troubleshooting.
• Flexible Mounting Options: Supports DIN rail, surface, and flush mounting with the appropriate mounting hardware.
• Copper and Aluminum Connections: Slotted box lugs on the line and load sides accommodate approved copper or aluminum conductors ranging from 14 AWG to 2 AWG.
• AC and DC Voltage Ratings: Supports 120V AC, 120/240V AC, 240V AC, and 48V DC applications within the manufacturer's specified ratings.

Technical Specifications

• Manufacturer: Schneider Electric
  
• Brand: Square D
  
• Catalog Number: QOU340
  
• Product Series: QOU
  
• Product Type: Miniature molded case circuit breaker
  
• Circuit Breaker Type: Standard
  
• Rated Current: 40 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

Electrical protection depends on more than amperage and voltage ratings. The Square D QOU340 is identified by Schneider Electric with the following certifications and conductor compatibility information, helping installers and maintenance professionals evaluate its suitability for their electrical systems:

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

Where It Works Best

• Residential Electrical Equipment
  
• Commercial Electrical Installations
  
• 40-Amp Three-Pole AC Circuits
  
• Compatible 240V AC Electrical Systems
  
• 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
  
• Compatible 48V DC Electrical Systems
  
• Electrical Equipment Maintenance
  
• Existing Square D QOU340 Replacements