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。