Further more:---
Those Circuit breakers you mention, SFCC and ECU etc are not on the 330 overhead panel as such at all.
The Lower Avionics bay contains Circuit breakers on the 330 and that is where those SFCC and ECU circuit breakers would be located for ENGINEERING USE.
Monitored by the CBMU ( circuit breaker monitoring unit ) and available on the C/B SD page on ECAM.
There are also other cabin related circuit breakers in the cabin.
Ok, happy now...
