Compound non-arcing DC circuit breaker

The utility model relates to a compound non-arcing DC circuit breaker, comprising a relay switch block (1), a logic controlling circuit (2), a power electronic component set (3), a diode D, a current limiting resistor R, etc. The utility model has the advantages that a compound switch and synchronous electronic control technology are adopted to enable a relay contact to be bypassed by an electronic switch without generating a DC arc drawing phenomenon during the moment when the relay contact is closed and opened, and the power electronic component can only be conducted with the protection of the current limiting resistor R during the moment when the relay contact acts; the average power consumption of the power electronic component is extremely small, ensuring very high reliability. Therefore, the utility model is a perfect switch breaker for a high-power DC circuit and can be widely used as a derailing switch on circuits for a communication power supply, a uninterrupted power supply (UPS), a train (an automobile) electric appliance and a DC motor.