Square D QO115EPD - 15 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

The Square D QO115EPD is a 15A, 120V, 1-pole plug-in molded case circuit breaker built to deliver dependable branch circuit protection in panelboards and load centers. Its plug-in connection means you can install or replace this breaker quickly, minimizing panel downtime and keeping your electrical system running smoothly.

• Fast plug-in connection for rapid installation and effortless replacement, reducing labor time on service calls or upgrades.
• Thermal-magnetic trip unit provides stable, repeatable protection—thermal logic handles overloads while magnetic action delivers a quick response to short circuits.
• OEM compatibility designed to fit matching Square D load centers and panelboards, ensuring reliable performance and a clean, code-compliant install.
• Versatile 15A, 120V protection suitable for residential circuits, light commercial panels, and modest industrial workloads where dependable overcurrent protection is essential.

What it is and why it matters

The QO115EPD is a thermal-magnetic molded case circuit breaker, a staple for safeguarding wiring and devices from overcurrent and short circuits. In everyday terms, it helps prevent nuisance trips from minor surges while delivering a fast, decisive response to dangerous faults. For property owners and technicians, this means fewer service interruptions, safer electrical systems, and easier maintenance in the field.

Key specifications

• Manufacturer: Square D
• Part number: QO115EPD
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 15A
• Voltage rating: 120V
• Number of poles: 1
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Upgrading or replacing a worn-out breaker in residential panelboards or load centers
• Adding a dedicated 15A circuit for kitchens, outlets, or light-duty equipment in small commercial spaces
• Maintaining code-compliant protection for branch circuits that demand reliable, predictable trip performance
• Quick swaps during panel maintenance where downtime must be minimized

How this compares to alternatives

Compared with non-plug-in or non-thermal-magnetic options, the QO115EPD offers an uncomplicated plug-in installation, matched OEM compatibility, and a proven thermal-magnetic trip profile that balances protection with reduced nuisance trips. This means fewer diagnoses, faster restoration of service, and a safer, more predictable protection strategy for your panelboard.

Practical tips for installation and use

• Verify your panelboard is compatible with Square D QO series breakers before installation.
• Always power down the main disconnect and test for absence of voltage before replacing breakers.
• Ensure the breaker seats firmly on the bus and locks into place for secure operation.
• Pair with appropriately rated circuits and conductors to maintain code-compliant protection across the panel.