Part 1 of IEC/EN 60898 applies to AC MCBs if the rated voltage between the phases does not exceed 440 V, the rated current does not exceed 125 A and the rated breaking capacity does not exceed 25,000 A. Circuit breakers that fall within the scope of IEC/EN 60898-1 are designed to be operated by non-experts. IEC/EN 60947-2 (VDE 0660-101) applies to circuit breakers in circuits with rated voltages up to 1,000 V AC, or up to 1,500 V DC.