Abstract: The quench protection system is one of the core technologies ensuring the safe operation of fusion devices, requiring extremely high reliability. The pyro-breaker, which simultaneously offers rapid response and inherent reliability, is widely used as the backup protection switch for large superconducting magnets during quenching. Due to the requirement for a demagnetization voltage of up to 15 kV, the structure of traditional pyro-breakers cannot meet the insulation level. A novel bipolar series pyro-breaker technology is proposed, which enhances the post-arc insulation capability of the switch. Firstly, the structure and working principle of the bipolar series pyro-breaker are introduced. The rupture mechanisms of the isolation contact and the arc contact are analyzed, and the rupture process is simulated. Finally, experimental tests on the prototype are conducted with a 60 kA current breaking test, proving that the switch can quickly interrupt the current under 15 kV. This research provides a solid theoretical foundation and experimental guidance for the design of large current pyro-breakers at higher voltage levels.