IEC / NEC

Breaker Ratings

Rated currents In available in each series. The Thai Electrical Code does not list standard ratings, so pick the series that matches the equipment you specify.

MCB (IEC 60898-1)

IEC 60898-1 preferred rated currents

6 A8 A10 A13 A16 A20 A25 A32 A40 A50 A63 A80 A100 A125 A

MCCB / ACB (IEC 60947-2)

Typical IEC 60947-2 frame/trip ratings from manufacturer catalogues

16 A20 A25 A32 A40 A50 A63 A80 A100 A125 A160 A200 A250 A320 A400 A500 A630 A800 A1000 A1250 A1600 A2000 A2500 A3200 A4000 A

NEC / UL standard ratings

NFPA 70 (NEC) 240.6(A) standard ampere ratings

15 A20 A25 A30 A35 A40 A45 A50 A60 A70 A80 A90 A100 A110 A125 A150 A175 A200 A225 A250 A300 A350 A400 A450 A500 A600 A700 A800 A1000 A1200 A1600 A2000 A2500 A3000 A4000 A5000 A6000 A

Source: IEC 60898-1 preferred values; NFPA 70 240.6(A); MCCB / ACB values are typical catalogue ratings, not a standard list. Verify against the edition that governs your project before design use.