Square D QO315 15A 3P Circuit Breaker, QO, Plug-On | AmpState

Meet the Square D QO315—a 3-pole, 15-amp plug-on circuit breaker engineered for dependable protection in panelboards, load centers, and electrical distribution systems. Built for retrofit work and maintenance where keeping the exact part number matters, this QO315 unit helps you preserve compatibility and inventory consistency across repairs and upgrades.

Key specifications

• Manufacturer: Square D
• Part number: QO315
• Product type: Circuit Breaker
• Amperage: 15 A
• Poles: 3
• Series/type: QO Plug-On
• Availability: AmpState

Why this matters for your project

• Fast retrofit and maintenance: The plug-on design lets you snap the breaker into existing QO-panel infrastructure quickly, reducing downtime during upgrades or service calls.
• Exact-fit continuity: As a dedicated QO plug-on breaker, QO315 keeps your protection scheme consistent with the rest of your Square D components, making stock management and replacements straightforward.
• Reliable protection for three circuits: With three poles, this unit provides coordinated, multi‑line protection suitable for three-phase distribution or multi-circuit panels.
• Trusted heritage: Built on Square D’s QO platform, it leverages decades of design for predictable trips and long-term performance in electrical distribution.
• Procured through AmpState: Access to genuine QO315 units from a trusted distributor, simplifying sourcing for maintenance fleets and facilities.

Ideal use cases and scenarios

• Retrofit projects where keeping the exact part number (QO315) simplifies procurement and compatibility checks.
• Spare parts for service vans and maintenance carts to reduce downtime when a 3P 15A circuit protection is needed.
• Upgrading or refurbishing panelboards and load centers that rely on the Square D QO series for uniform protection across all poles.
• Emergency replacements in electrical distribution systems where a quick, plug-on installation minimizes disruption.

Compatibility and fit

The QO315 is designed specifically for Square D QO-series panelboards and load centers. It is a plug-on breaker, meaning it is intended to snap onto the bus and integrate with the QO family of protection devices. When your system uses QO components and requires a 3-pole, 15-amp protection device, this part is the reliable choice.

If you’re unsure about fit, AmpState is available to help confirm compatibility and ensure you get the exact part you need for your panel configuration.