A novel hybrid current-limiting circuit breaker based on high speed electro-magnetic driven switch and bi-directional thyristor switch is presented. A 3 kA/320 V current-limiting circuit breaker is developed and the commutating process is analyzed with high rising rate current. The equivalent circuit model and calculating formulas are obtained. The experimental results by different d i /d t values show that the equivalent circuit model is correct. By reducing inductance of commutating circuit and delayed time of electro-magnetic driven switch， the current of 13.6 kA is transferred within 100μs successfully.