When replacing an existing Siemens circuit breaker, it must always be replaced with a genuine, matching model from the exact same manufacturer series—typically standard Siemens Type QP or QT branch breakers. Installing unauthorized third-party alternative brands into a modern Siemens load center is strictly prohibited by the National Electrical Code because it compromises the physical bus bar connection, creates dangerous arcing and overheating risks, and instantly voids all equipment safety listings and warranties.
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