Eaton QB1040EP - 40 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Eaton QB1040EP is a compact, rugged 40A, 120V, 1-pole molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Its bolt-on mounting provides a secure, vibration-resistant connection to the bus, helping you maintain consistent protection in demanding electrical environments.

Key features that matter in real-world panels

• Secure bolt-on mounting — creates a rigid bus connection that stays put even in panels exposed to vibration from motors or HVAC equipment.
• Thermal-magnetic trip unit — combines thermal and magnetic protections for stable, repeatable trip performance across varying load conditions and fault scenarios.
• 1-pole, 40A, 120V — ideal for protecting individual branch circuits such as lighting, receptacles, small motors, and other everyday loads.
• Panelboard compatibility — designed to work with matching OEM load centers and panelboards, streamlining replacements and upgrades.
• Versatile applications — well-suited for residential, commercial, and light industrial environments where dependable circuit protection is essential.

Technical specifications at a glance

• Manufacturer: Eaton
• Part Number: QB1040EP
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases and real-world benefits

Whether you’re upgrading an aging panel or wiring a new installation, the QB1040EP provides targeted protection for individual circuits without unnecessary complexity. Use it to:

• Protect lighting circuits, receptacle banks, or small equipment circuits in residential or light commercial panels.
• Upgrade subpanels or retrofit older panelboards where a secure bolt-on connection improves reliability.
• Match protection characteristics to circuit loads with a precise 40A rating, helping prevent nuisance trips while guarding against dangerous faults.

What makes this breaker a smart choice

Choosing the QB1040EP means prioritizing consistent protection and installation reliability. The bolt-on design minimizes movement-related wear, while the thermal-magnetic trip mechanism ensures quick response to short circuits and stable performance during normal operation. Paired with compatible OEM load centers, it delivers a cohesive, maintenance-friendly solution for your electrical distribution needs.

Who should consider the Eaton QB1040EP

Electricians, facilities managers, and well-equipped DIY installers who need dependable, ready-to-install branch circuit protection will find this breaker a practical choice. It’s particularly well-suited for projects that require a single-pole, 40A protection device within residential environments, commercial spaces with simple panel configurations, or light industrial setups demanding reliable circuit guarding.