Square D QOU145 - 45 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOU145 is a 45A, 120V, 1-pole bolt-on molded case circuit breaker engineered to deliver dependable branch-circuit protection in panelboards and load centers. With a compact, rugged design, it fits seamlessly into residential, commercial, and light industrial electrical solutions that demand reliable overcurrent and short-circuit safeguards.

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection for steady electrical performance in environments with equipment movement or vibration.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining overload sensing with magnetic short-circuit protection, minimizing nuisance trips while responding decisively to fault conditions.
• 1-pole, 45A, 120V rating tailored for individual branch circuits that require solid protection without unnecessary power interruption.
• OEM-compatible design works with matching Square D OEM load centers and panelboards, simplifying replacements and upgrades.
• Versatile applications ideal for residential panels, commercial electrical rooms, and light industrial equipment where compact, reliable protection is crucial.

Why this model stands out where other breakers fall short: the QOU145 is built to endure routine panel maintenance and everyday load fluctuations while delivering fast, predictable tripping behavior when a fault occurs. The bolt-on format not only speeds up installation but also helps maintain a solid connection over time, reducing the risk of loose connections in busy service panels.

Use cases and scenarios

• Replacements in existing Square D panelboards where a 45A, 120V single-pole device is required.
• Protecting high-demand branches such as electric heating circuits, air handlers, or large lighting circuits that consistently draw near the 45A limit.
• Panel upgrades in homes or small commercial spaces where reliability and compatibility with OEM components are priorities.

Key specifications at a glance

• Manufacturer: Square D
• Part Number: QOU145
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choose the Square D QOU145 when you need a dependable, OEM-compatible solution that delivers precise protection for 120V circuits, minimizes downtime through straightforward bolt-on installation, and supports consistent performance across residential, commercial, and light industrial environments.