Surge protection circuit, lightning protector and electronic device

A surge protection circuit comprising:

• a live wire port;
• a neutral wire port;
• a first protection circuit connected between the live wire port and the neutral wire port, wherein the first protection circuit comprises a first varistor and a current fuse;
• and
• a second protection circuit connected between the live wire port and the neutral wire port, wherein:
• the second protection circuit comprises a second varistor and a thermal fuse, and
• the first protection circuit and the second protection circuit are connected in series.

An electronic device comprising a surge protection circuit, wherein the surge protection circuit comprises:

• a first protection circuit configured to respond to a first voltage surge above a first voltage threshold;
• and
• a second protection circuit electrically connected to the first protection circuit, wherein:
• the second protection circuit is configured to respond to a second voltage surge above a second voltage threshold,
• the second voltage threshold is higher than the first voltage threshold,
• the first protection circuit comprises a first varistor,
• the second protection circuit comprises a thermal fuse and a second varistor, and
• in response to the second voltage surge, the first varistor is connected in series with at least one of the thermal fuse or the second varistor.