Arc-extinguishing circuit with two power supplies and apparatus

An arc extinguishing circuit comprising:

• a mechanical switch configured to be connected in series with a load to form a first series circuit;
• a first switch and a first capacitor;
• a first charging unit comprising a second switch, wherein the first switch and the second switch are semiconductor switches;
• a first power supply configured to charge the first capacitor by the first charging unit, wherein the first power supply is provided by a power supply connected to the first series circuit;
• a third switch, wherein the third switch, the first capacitor and the second switch form a third series circuit, and the third series circuit is configured to charge the first capacitor;
• and
• a second power supply configured to supply power to the load by the first switch and the first capacitor during disconnection of the mechanical switch so as to provide arc extinguishing.