Square D QO145 - 45 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D QO145 — a 45A, 120V, 1-pole plug-in circuit breaker built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Designed for fast deployment, it snaps into place with a plug-in connection that reduces installation time and simplifies replacements when service calls or upgrades are needed.

• 45 Amps, 120 Volts, 1-Pole — targeted protection for a dedicated branch circuit within residential, commercial, or light industrial systems.
• Plug-in Molded-Case Design — a rugged, compact form factor that slides into compatible QO load centers for quick, tool-free installation.
• Thermal-Magnetic Trip Unit — delivering stable, repeatable protection with fast fault response while minimizing nuisance trips during inrush conditions.
• OEM Compatibility — engineered to integrate seamlessly with matching Square D QO load centers and panelboards for reliable performance and straightforward replacements.
• Versatile Applications — ideal for residential circuits, light commercial feeders, and simple power-distribution needs across varied environments.

Why this breaker stands out

What makes the QO145 different is its deliberate pairing of a plug-in connection with a dependable thermal-magnetic protection scheme. This combination reduces downtime during panel servicing and provides predictable trip behavior, helping protect wiring and connected devices without overcomplicating maintenance or upgrades. It’s a practical, future-ready choice for any project that uses Square D’s QO family of panelboards.

Practical use cases

• Replacing a failed breaker in existing Square D QO panelboards with minimal downtime.
• Upgrading a branch circuit to support larger loads while staying within a 120V system.
• Adding a dedicated circuit in new or retrofit projects for lighting, receptacles, or equipment in residential, commercial, or light industrial settings.

Technical specifications at a glance

• Manufacturer: Square D
• Part Number: QO145
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

When you need reliable, straightforward protection for a single, dedicated circuit within a Square D-equipped panel, the QO145 delivers. Its fast, plug-in installation, durable molded-case construction, and thermal-magnetic protection make it a practical choice for dependable electrical safety in a wide range of settings. Order with confidence from AmpState and keep your panel running smoothly.