MCCB with 22 kA interrupting capacity — what it means for your distribution panel
The ABB XT1SU3080AFF000XXX is a 3-pole molded case circuit breaker from the XT1S 125 TMF series, carrying a 22 kA interrupting rating on the AC side. In a Tier III or IV facility, you coordinate this against the next device upstream so a downstream fault on a branch feeder doesn't take the whole switchboard out.