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The QHB315 is a reliable Square D 3-pole 15A bolt-in circuit breaker designed for 120/240V applications. With a robust short-circuit rating of 65kA, it ensures optimal protection for your electrical systems. Perfect for both residential and commercial use, this breaker guarantees safety and performance in demanding environments.
The key difference is the mounting style. Standard QO breakers are plug-in (snap-in) breakers, while QHB series breakers are bolt-in (bolt-on), meaning they are mechanically fastened to the bus bar with a bolt. This gives the QHB a more secure connection and a higher interrupting rating (65kA on the QHB315 vs. typically 10–22kA on standard QO plug-ins), making the QHB better suited for commercial or higher fault-current environments.
The QHB315 is rated at only 15A, so it is intended for use as a branch circuit breaker rather than a main breaker. If you require a main breaker for your panelboard, a higher-amperage breaker in the appropriate frame would be needed. Contact our team and we can help identify the right product for your application.
The QHB series is considered a specialty or harder-to-source product line. Northern Breaker Group specializes in exactly this type of obsolete and hard-to-find breaker. Whether you need a new old-stock unit or a verified compatible replacement, contact our Calgary, Edmonton, or Vancouver branches and our team will source the right solution for you.
