Only genuine Square D QO circuit breakers are officially approved, tested, and UL-listed to fit into a Square D QO electrical load center. Because QO panels are engineered with a proprietary, compact 3/4-inch wide format and specific mounting rails, attempting to install standard 1-inch breakers or unauthorized third-party alternative brands violates electrical building codes, ruins the panel's safety listing, creates severe arc-fault and fire risks, and instantly voids the manufacturer warranty.
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