QOU240 - 40 Amp Circuit Breaker

QOU240 - 40 Amp Circuit Breaker

Some electrical installations need more flexibility than a traditional load center can offer. Whether you're building a custom control panel, maintaining commercial equipment, or replacing an existing unit-mounted breaker, the Square D QOU240 40 Amp 2-Pole Circuit Breaker provides reliable overcurrent protection in a compact design. Manufactured by Schneider Electric, this QOU series breaker is rated for 40 amps and features a 10kA interrupting capacity at 120/240V AC.

The QOU240 uses a thermal-magnetic trip mechanism to respond to overloads and short circuits, helping protect electrical wiring and connected equipment from excessive current.

Key Features and Benefits

• 40-Amp, Two-Pole Design: Provides overcurrent protection for compatible 40A circuits requiring a two-pole breaker.
• Thermal-Magnetic Protection: Responds to overloads and short circuits, helping protect wiring and connected electrical equipment.
• VisiTrip Indicator: Provides a visible indication when the breaker trips, making it easier to identify the affected circuit during troubleshooting.
• Flexible Mounting Options: Supports DIN rail, surface, and flush mounting with the appropriate mounting feet or accessories.
• Copper and Aluminum Connections: Slotted box lugs on both the line and load sides accept approved copper or aluminum conductors from 14 AWG through 2 AWG.
• AC and DC Operational Voltage Ratings: Rated for 120V AC, 120/240V AC, and 48V DC operation, subject to the applicable electrical ratings and installation requirements.

Technical Specifications

• Manufacturer: Schneider Electric
  
• Brand: Square D
  
• Catalog Number: QOU240
  
• Product Series: QOU
  
• Product Type: Miniature molded case circuit breaker
  
• Circuit Breaker Type: Standard
  
• Rated Current: 40 Amps
  
• Number of Poles: 2
  
• Trip Mechanism: Thermal-magnetic
  
• Trip Indicator: VisiTrip
  
• Rated AC Voltage: 120V AC / 120/240V AC
  
• Rated DC Voltage: 48V DC
  
• AC Interrupting Rating: 10kA at 120V AC and 120/240V 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: 1.50 inches (38.1 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

When you're selecting a circuit breaker, documented safety certifications and conductor compatibility are just as important as the amperage rating. Schneider Electric identifies the Square D QOU240 with the following certifications and material compatibility information:

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

Schneider Electric states that its QOU miniature circuit breakers have been verified by UL and CSA against their published specifications. The QOU240 is also classified as HACR rated for applicable heating, air conditioning, and refrigeration equipment.

Where It Works Best

• Residential Electrical Equipment
  
• Commercial Electrical Installations
  
• 40-Amp Two-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 QOU240 Replacements