A 4 phase DC MCB is a type of circuit breaker designed to protect direct current electrical systems from overloads and short circuits. Unlike traditional circuit breakers, which are designed for alternating current systems, 4 phase DC MCBs are specifically engineered for direct current applications. These miniature circuit breakers are composed of four poles that can disconnect all three phases and the neutral in a DC electrical system. 4 phrase DC MCBs can typically handle voltages ranging from 250V to 800V and have adjustable trip thresholds to match the specific requirements of the system they are protecting. They are commonly used in solar power systems, electric vehicles, and industrial machinery.