A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current. It is a sacrificial device; once a fuse has operated it is an open circuit, and must be replaced or rewired, depending on its type.
DC Miniature Circuit Breaker (DC MCB) is particularly designed for DC over-current and short-circuit protection in an electrical circuit. DC MCB and the AC MCB have the same functions. Only application scenarios are different. DC MCB is mainly used for direct current (DC) systems applications, line Solar Photovoltaic (PV) and Solar Battery Energy Storage Systems (BESS). The voltage state of DC MCB is generally DC 12V-1500V.
Reference:
[1] https://en.wikipedia.org/wiki/Fuse_(electrical)
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