STEP UP TRANSFORMER CIRCUIT BREAKER Home › Electrical Engineering Forum › General Discussion › STEP UP TRANSFORMER CIRCUIT BREAKER This topic has 1 reply, 2 voices, and was last updated 12 years ago by vijay. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 2012/07/19 at 4:37 pm #10909 AnonymousGuest I have 2 generators each rated 5.6MVA, 6.3kV terminal voltage and 0.9pf to be stepped up by 2 lots 6MVA power transformers. Should I use 1000A or 1250A CB immediately after each transformer for protection? Anyone with an answer please help. 2012/10/05 at 12:48 pm #13229 vijayParticipant 1000A is ok Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In