Eaton QC3040H - 40 A, 9 V, 3-Pole Circuit Breaker | AmpState

The Eaton QC3040H delivers dependable branch circuit protection in a compact molded case design, tailored for panelboards and load centers. At 40A and 3 poles with a 9V rating, this breaker is built to handle overcurrent and short-circuit events with precision and repeatable performance.

• Compact molded case design maximizes panel space, making it easier to fit multiple circuits in tight electrical enclosures without compromising protection.
• Thermal-magnetic trip unit provides stable, repeatable protection by responding to both overloads and short circuits, reducing nuisance trips and extending circuit reliability.
• 3-pole configuration supports multi-wire and 3‑phase distribution needs, delivering coordinated protection across three conductors.
• OEM-friendly compatibility designed to pair with matching OEM load centers and panelboards for straightforward replacement and installation.
• Versatile applications suitable for residential panels, commercial distribution, and light industrial panels, where compact, reliable protection is essential.

Designed for real-world scenarios, the QC3040H shines in situations where space is at a premium and dependable protection matters. Use it to safeguard branch circuits in a home subpanel, a small to mid-sized commercial panel, or a light industrial distribution panel, all while maintaining clean wiring and reliable interruption protection when circuits fault or short.

Technical at a glance

• Manufacturer: Eaton
• Part Number: QC3040H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 9V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Who benefits most electrical professionals, panel builders, and facility managers who need a reliable, space-efficient 3-pole breaker that aligns with OEM panel systems. The QC3040H minimizes replacement headaches by ensuring compatibility with matching Eaton panelboards and loadcenters, reducing retrofit time and field adjustments.

Practical installation tips — verify the panel’s compatibility with the QC3040H’s 3-pole, 40A, 9V specification; ensure secure mounting and proper conductor termination; plan circuit layouts to optimize panel space use, taking advantage of the breaker’s compact design for tidy, organized enclosures. For ongoing reliability, inspect connections during routine panel maintenance and replace any worn components only with Eaton-specified parts.