This DETA 16amp circuit breaker safely cuts off power immediately if the circuit becomes overloaded (too many electrical appliances being used), or short circuited (a faulty appliance). Plug-in circuit breakers are more reliable and have a faster response time then standard rewireable fuses. Once installed, they do not require any tools to be reset, simply switch back on once the fault has been fixed. DIY replacement of wire fuses in ceramic type fuse holders.