Yes, a faulty circuit breaker can cause electrical fires. Circuit breakers are designed to protect your home by interrupting the flow of electricity in case of an overload or short circuit. If a breaker is faulty and fails to trip when it should, excessive electrical current can cause wires to overheat, potentially igniting an electrical fire. Regular inspections and maintenance of your electrical system, including circuit breakers, are essential to ensure they function properly and provide the necessary protection against fire hazards.