to melt or blow, especially referring to a fuse or electrical wire

电流过大导致保险丝自动熔断了。

to suspend stock market trading temporarily as a circuit breaker during high volatility

股市跌幅触发了熔断机制，交易全面停止。

verb · to suspend airline flights on a specific route as a regulatory penalty, typically for health or safety violations

该国际航线因输入病例过多被民航局熔断。