Internal failure possibly on power side, lower than 300A fault current so unit could not trip i/p protection and as fault was post ac section, continued to burn internally. it just broke no breakers tripped out so it kept drawing current until the fault burnt away.
maybe this is what happened, need to know a lot more info to change hypothisis
Answers & Comments
Internal failure possibly on power side, lower than 300A fault current so unit could not trip i/p protection and as fault was post ac section, continued to burn internally.
it just broke
no breakers tripped out so it kept drawing current until the fault burnt away.
maybe this is what happened, need to know a lot more info to change hypothisis