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The QOU390 Square D 3P 90A 240V Bolt On / DIN Rail Breaker provides reliable protection for your electrical systems. Designed for easy installation, this circuit breaker features three poles and a 90 amp capacity, making it ideal for various applications, including residential and commercial setups. Trust Square D quality for optimal performance.
No. The QOU and QO are distinct Square D series and are not interchangeable. The QOU390 is designed specifically for QOU-series loadcentres and supports both bolt-on and DIN rail mounting, whereas the QO series uses a different bus connection and clip system. Always match the breaker series to your panel — contact us if you're unsure which series your panel takes.
Yes. Square D QOU-series breakers are CSA-certified and designed to meet Canadian Electrical Code standards for use in Canada. The QOU390 is rated 90A, 3-pole, 240V with a 10kA interrupting capacity, which satisfies typical CEC requirements for residential and light commercial branch and feeder circuit protection. Always verify that the breaker's interrupt rating meets or exceeds the available fault current at the installation point.
The QOU series can be difficult to source through general electrical distributors, as it is a specialized Canadian-market product. Northern Breaker Group specializes in exactly these kinds of hard-to-find breakers. We maintain stock of QOU-series breakers across our Calgary, Edmonton, and Vancouver locations — reach out for a quote or to check current availability.
