When a main circuit breaker at your service panel trips while a downstream Ground Fault Circuit Interrupter (GFCI) outlet remains untripped, it indicates a specific type of electrical fault outside the GFCI's sensing purview. A standard circuit breaker trips due to overall current overload (drawing more amps than the wire gauge allows) or a direct short-circuit between hot and neutral wires anywhere along the circuit. A GFCI, conversely, only trips when it detects a current imbalance between hot and neutral lines caused by a ground fault or shock hazard. Therefore, an overload will trip the main breaker without triggering the GFCI sensor. You can troubleshoot breaker trips safely by unplugging high-draw appliances. You can verify that your corrective action is successful when redistributing electrical loads across different circuits stops the main breaker from tripping.
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