QO340 - 40 Amp Circuit Breaker

QO340 - 40 Amp Circuit Breaker

The QO340 40 Amp Circuit Breaker from Schneider Electric’s QO series is built for reliable, everyday protection in residential, commercial, and light industrial electrical systems. This 3-pole breaker is rated for 40 amps and operates at 120/240 volts AC, making it a solid choice for handling a variety of circuit protection needs. With its 10kA interrupting capacity and thermal magnetic trip design, it quickly reacts to overloads and short circuits to help keep your wiring and equipment safe.

Key Features and Benefits

• Dependable Overcurrent Protection: The thermal magnetic trip system provides fast, accurate protection when circuits are overloaded or shorted.
• VisiTrip™ Indicator: A small but helpful feature that shows when the breaker has tripped, saving time during troubleshooting.
• Straightforward Installation: Designed with a plug-in mounting style, it’s easy to install or replace without extra hassle.
• Flexible Applications: Works in both AC and DC setups, making it suitable for homes, commercial buildings, and some industrial equipment.
  

Technical Specifications

• Amperage: 40A
  
• Voltage: 120/240V AC
  
• Interrupting Capacity: 10kA @ 120/240V AC
  
• Number of Poles: 3
  
• Mounting: Plug-in
  
• Wire Compatibility: AWG 8 to AWG 2 (copper or aluminum)
  
• Torque Requirement: 44.3 lbf.in (5 N.m)
  
• Dimensions:
  • Height: 3.0 inches
  • Width: 2.2 inches
  • Depth: 2.9 inches
• Weight: 0.800 lbs
  

Material Compliance and Certifications

• UL Listed: File E84967
• CSA Certified: Master Contract 153555
  
• RoHS and REACh Compliant: Reduced environmental impact
• Green Premium™ Label: Meets Schneider Electric’s sustainability standards
  

Suitability

• This breaker is a practical choice for protecting electrical circuits in breaker panels across different environments—from homes to offices to small manufacturing setups. It’s a popular option among electricians and contractors who need a circuit breaker they can trust to perform consistently.