If overload, phase imbalance or phase failure occur in the main circuit, then it doesn't look good for the connected load - that is if you are not reliably protected.

SIRIUS 3RV circuit-breakers are compact, current-limiting circuit-breakers.They ensure safe shutdown in the event of a short-circuit and protect loads and plants against overload.

For decades now, SITOR semiconductor fuses have provided converters, rectifiers, UPS systems and much more with reliable protection against short-circuits, as well as lines against overloads.