QO140 - 40Amp Circuit Breaker

QO140 - 40Amp Circuit Breaker

The Square D QO140 is a 40 Amp, 1-pole plug-on circuit breaker designed to provide dependable overcurrent and short-circuit protection for compatible QO load centers and panelboards. Built for 120VAC electrical systems with a 10kA A.I.C. interrupting rating, this breaker helps safeguard branch circuits while supporting reliable day-to-day operation in residential and light commercial applications. Its compact plug-on design allows for straightforward installation in compatible panels, making it a practical choice for new installations, panel upgrades, and replacement projects. Whether you're maintaining an existing electrical system or completing a new build, the QO140 circuit breaker delivers the performance and compatibility professionals and property owners expect from the trusted QO product line.

Key Features and Benefits

• 40 Amp current rating: 40 Amp current rating for branch circuit protection.
• Single-pole (1P) configuration: Single-pole (1P) configuration for 120VAC applications.
• Plug-on mounting design: Plug-on mounting design for quick installation in compatible QO load centers and panelboards.
• 10kA A.I.C. interrupting rating: 10kA A.I.C. interrupting rating at 120VAC for dependable fault interruption.
• Compact footprint: Compact footprint helps maximize available panel space.
• Reliable protection: Designed to provide reliable protection against overloads and short circuits.
• Versatile application: Suitable for maintenance, replacement, and new electrical installations using compatible QO equipment.
  

Technical Specifications

• Part Number: QO140
  
• Type: QO
  
• Mounting Style: Plug-On
  
• Poles: 1
  
• Amperes: 40A
  
• Voltage Rating: 120VAC
  
• Interrupting Rating (A.I.C.): 10kA @ 120VAC
  
• Dimensions:
  • Height: 3.0 in.
  • Width: 0.75 in.
  • Depth: 2.5 in.

Material Compliance and Certifications

• Industry Standards: The Square D QO140 is manufactured to meet applicable industry standards for molded case circuit breakers.
• Installation Notice: Always verify compatibility with your electrical system and ensure installation complies with applicable national, state, and local electrical codes. Product certifications and compliance may vary by production date and application.
  

Where It Works Best

• The QO140 40 Amp plug-on circuit breaker is well suited for residential electrical panels using compatible QO load centers, light commercial electrical distribution systems, branch circuit overload and short-circuit protection, electrical panel upgrades and maintenance, replacement of compatible 40 Amp QO single-pole circuit breakers, and new construction and renovation projects requiring a 120VAC, 1-pole, 40 Amp breaker.