The fuse has blown because you have overloaded the circuit.你让电路过载，保险丝烧断了。Fires can start from circuit overloads.电路过载可能引发火灾。There is an internal circuit breaker to protect the instrument from overload.内置有断路器，防止设备过载。Never overload an electrical socket.千万不要使电源插座过载。