A safety device that protects an electric circuit from excessive current, consisting of or containing a metal element that melts when current exceeds a specific amperage, thereby opening the circuit.

• 保险丝一种由金属构成的防止过多电流通过保护电路的一种安全装置，当电流超过限定的电流强度时，金属就会熔化，从而打开电路