QOB140 - 40A Circuit Breaker

QOB140 - 40A Circuit Breaker

The Square D QOB140 is a 40 Amp, single-pole bolt-on circuit breaker designed to provide dependable overcurrent and short-circuit protection in your commercial, industrial, and institutional electrical distribution systems. As part of the trusted QOB series, this breaker features a secure bolt-on mounting design that helps you to maintain a solid electrical connection in panelboards where vibration resistance and long-term reliability are important. Rated for 120VAC with a 10kA interrupting capacity, the QOB140 is well suited for protecting individual branch circuits serving lighting, receptacles, and dedicated equipment within compatible electrical panels. Its compact footprint also makes it a practical choice when panel space is limited, while the proven QOB design supports dependable operation and simplified maintenance by qualified electrical professionals. Built for consistent performance in demanding applications, the QOB140 is an excellent option for maintaining the safety and efficiency of electrical distribution systems.

Key Features and Benefits

• 40 Amp Continuous Current Rating: 40 Amp continuous current rating for reliable branch circuit protection.
• Single-Pole Design: Single-pole design for use on 120VAC circuits.
• Bolt-On Mounting Configuration: Bolt-on mounting configuration helps provide a secure mechanical and electrical connection.
• 10kA A.I.C. Rating: 10kA A.I.C. rating at 120VAC for dependable interruption of fault currents within its rated capacity.
• Compact Form Factor: Compact form factor fits compatible panelboards while maximizing available space.
• Electrical System Protection: Designed to help protect electrical systems from overloads and short circuits.
• Compatible QOB Panelboards: Suitable for replacement, maintenance, and new installations using compatible QOB panelboards.
  

Technical Specifications

• Part Number: QOB140
  
• Type: QOB
  
• Mounting Style: Bolt-On
  
• Poles: 1
  
• Amperage: 40 Amps
  
• 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: Manufactured to meet applicable industry standards for molded case circuit breakers within the QOB product family.
• Installation Requirements: Designed for installation in compatible electrical distribution equipment in accordance with applicable electrical codes and manufacturer requirements.
• Qualified Personnel: Installation and servicing should be performed by qualified personnel following all applicable local and national electrical regulations.
  

Where It Works Best

• The Square D QOB140 is ideal for commercial buildings, industrial facilities, schools, healthcare facilities, retail spaces, and other professional electrical installations that utilize compatible QOB bolt-on panelboards. It is commonly used to protect lighting circuits, receptacle circuits, dedicated equipment, and other 120VAC branch circuits where dependable overcurrent protection and a secure bolt-on connection are required. Its compact dimensions and trusted QOB design make it a practical solution for both replacement projects and routine electrical system upgrades.