Square D QOU345 45A 3P 240V Circuit Breaker, Bolt-On | AmpState

The Square D QOU345 is a dependable bolt-on circuit breaker designed to safeguard electrical distribution in panelboards, load centers, and other origins of power delivery. With a 45 Amp, 3-pole configuration for 240V systems, this unit delivers robust, reliable protection for everyday electrical work and maintenance projects alike. Its bolt-on design is purpose-built for retrofit scenarios where keeping the same part number simplifies ordering, stocking, and service planning.

• Amperage: 45 A
• Poles: 3
• Voltage: 240 V
• Mounting: Bolt-On
• Brand: Square D
• Part Number: QOU345
• Applications: Panelboards, Load Centers, Electrical Distribution
• Availability: AmpState

The QOU345 shines in retrofit and maintenance-heavy environments. When upgrading or servicing existing equipment, a part number you can trust matters for quick ordering and predictable replacements. The bolt-on mounting provides a secure, rugged connection suitable for demanding installations, reducing the risk of loose connections during service or vibration. With its 3-pole, 240V protection, this breaker is well-suited for three-phase electrical systems common in commercial and industrial settings.

Why this breaker stands out

• retrofit-ready: Bolt-on mounting streamlines installation in panels where a site-specific fit must be preserved, minimizing downtime during upgrades.
• Part-number consistency: QOU345 supports long-term maintenance planning and easy part sourcing, avoiding the confusion that can come with changing identifiers.
• Clear compatibility path: Built for panelboards and load centers, it integrates with standard Square D distribution setups, helping maintain continuity in electrical protection schemes.
• Three-phase readiness: 3-pole configuration ensures synchronized protection across all conductors in 240V, three-phase circuits.

If you’re unsure about fit or compatibility, AmpState is ready to help. Message us to confirm the QOU345’s compatibility with your panelboard or load center and we’ll verify the correct fit.

Practical tips for use:

• Plan retrofits by verifying that your existing panel supports bolt-on breakers and the QOU345’s 3-pole, 240V rating.
• Coordinate maintenance windows so you can safely shut down circuits and replace breakers without disrupting critical loads.
• Store spare QOU345 units with other protective devices in your inventory to simplify future maintenance planning.
• Follow the manufacturer’s installation guidelines to ensure secure mounting and proper electrical protection coverage.