Arc-free DC circuit breaker

An arc-free DC circuit breaker, characterized in that the circuit breaker comprises a main current circuit and a transfer current circuit;

• wherein
• the main current circuit is for current in a normal working state to pass through;
• the transfer current circuit is for when a short-circuit fault current occurs, implementing transfer of the short-circuit fault current to the main current circuit, and limiting and breaking the short-circuit fault current;
• the transfer current circuit includes a bridge circuit, the bridge circuit comprising a first circuit (1), a second circuit (2);
• a third circuit (3), a fourth circuit (4), an induction module (5), an over-voltage protection module (6), a capacitor (C) and resistor (R);
• the first circuit (1) and second circuit (2) are connected in series and then connected in parallel with a circuit formed by the third circuit (3) and the fourth circuit (4) which are connected in series;
• a first endpoint is provided between the first circuit (1) and second circuit (2);
• a second endpoint is provided between the third circuit (3) and the fourth circuit (4);
• a serial-connection circuit formed by a secondary side inductor (L1) in the induction module (5), a circuit formed by the resistor (R) and the capacitor (C) connected in parallel, and the over-voltage protection module (6) is connected between the first endpoint and the second endpoint to form the bridge circuit.