Fuses protect against overcurrent events by melting their elements and opening the circuit. Fuses must be applied at or below their specified voltage rating, which differs between ac and dc current.AC/DC/HRC Fuse Supply Fast-acting fuses open very quickly when their current rating is exceeded. This action is needed when speed is important for sensitive electronics and for many dc power applications. They are generally used in resistive loads with low inrush current levels.
