What It Is & Where It Fits
The ABB BC9-30-01-01 is an electrical contactor — a magnetically held switch used to open and close power circuits under load, typically in motor starter or lighting contactor panels. It sits in the Contactors and Starters category, under Electrical Contactors.
Peer Comparison — B7D-30-01-01
If your panel was originally wired for the B7D-30-01-01, the BC9-30-01-01 may not drop in without checking the mounting footprint and coil voltage — those specs are not in the record, so a physical or datasheet comparison is needed before committing.