If the main and backup sources are reversed, the ATS will still operate according to its own logic, but it will treat the backup power source as the main power source. This means that even if the actual main power source is normal, the system may continue to use the backup. Yes, Molded Case Circuit Breakers (MCCBs) can often be connected in reverse, but it depends on the specific design and ratings of the MCCB. Here's what you need to know: A reverse connection occurs when the line (power source) is connected to the breaker's load terminals and the load (equipment) is. Can circuit breakers be reverse-fed or back-fed? Any circuit breaker that does NOT have Line and Load (or + and - on DC breakers) identifying markings may be reverse fed. See the compiled list below: HOM (Excludes those with suffix GFI, EPD, AFI, CAFI and DF. A blow out coil is used in large breakers where a heavy fault has to be cleared quickly. It draws. In 30 minutes we cutover from our primary power circuit to a backup circuit for two days! Backups taken and tested, stakeholders informed, critical data off-site, vendors on standby. Don't think I'll be able to unpucker my anus until Easter Sunday. This function is maintained with a change-over switching device according to IEC 60947-6-1 norm.