To protect the electrical circuits used blade-type fuses, the color of which corresponds to a current protection fuse. The fuse is determined by the presence of the wire conductor connecting contacts of the fuse. To replace a failed fuse switch off the corresponding electric chain, take a safety lock from a nest tweezers. If newly installed fuses instantly fails at pressure giving, check the protected elec kuyu chain. If the safety lock protects some chains, they must be connected in turn to a blown fuse on the defective circuit.