Square D QOU315 - 15 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Square D QOU315 is a 15A, 240V, three-pole bolt-on molded case circuit breaker built to deliver dependable overcurrent and short-circuit protection for panelboards and load centers. Engineered for real-world reliability, it stays put under vibration and heavy electrical loads, helping keep critical circuits safe and steady.

Key to its standout performance is the secure bolt-on mounting that establishes a rigid, vibration-resistant bus connection. That solid mechanical fit translates into consistent electrical contact, reduced arcing risk, and fewer nuisance trips in demanding environments—perfect for spaces where panels see regular switching, door openings, or equipment vibration.

The thermal-magnetic trip unit is designed for stable, repeatable protection across a wide range of temperatures and loads. You get precise overload protection (thermal) plus fast short-circuit response (magnetic), so you’re protected without unnecessary trips during normal start-ups or transient faults common in commercial and light industrial settings.

Why this QOU315 stands out

• 3-pole design for three-phase systems—supports multi-phase distribution in commercial or industrial panels, enabling coordinated protection across all hot conductors.
• Bolt-on mounting—ensures a solid, vibration-resistant connection to the bus, simplifying installation and reducing maintenance concerns over time.
• Thermal-magnetic protection—provides reliable, predictable trips for overloads and short circuits, preserving equipment and preventing damage to downstream devices.
• OEM-compatible—designed to be compatible with matching Square D OEM load centers and panelboards, making replacements straightforward and downtime minimal.
• Versatile application across sectors—suitable for residential, commercial, and light industrial applications where robust 240V protection is needed.

Practical use cases

• Protect three-phase feeders in small commercial buildings, data rooms, or light manufacturing lines.
• Replace worn or obsolete breakers in existing Square D panelboards to restore reliable circuit protection without reconfiguring bus bars.
• Protect branch circuits feeding critical loads that require precise, repeatable interruption models to minimize downtime.

Technical at a glance

• Manufacturer: Square D
• Part Number: QOU315
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 15A
• Voltage: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Whether you’re outfitting a new panel or refreshing an aging distribution setup, the Square D QOU315 delivers reliable protection with installation confidence. It’s a practical, long-term solution for professionals who value precise protection characteristics, durable construction, and compatibility with established Square D panel ecosystems.