200 V peak reverse, 8 A average — the rectifier for a 115 VAC or 230 VAC secondary
The Vishay VS-KBPC802PBF is a single-phase bridge rectifier in the VS-KBPC8 series, rated for 200 V peak reverse voltage and 8 A average rectified output current. That 200 V PRV covers a 115 VAC secondary winding with margin; for a 230 VAC secondary you would step up to the 400 V or 600 V sibling in the same series. The D-72 through-hole package (4-Square, D-72) is the standard industry footprint for this current class — the four leads insert into a PCB or solder to a terminal block, and the metal tab on the body conducts heat to the board or a clip-on heatsink.
Forward drop and leakage — the efficiency and standby numbers
Maximum forward voltage is 1 V at 3 A test current — at the full 8 A rating the Vf will be higher, but the 1 V figure at 3 A gives a baseline for conduction loss in lighter loads. Reverse leakage is 10 µA at the rated 200 V reverse voltage, which is typical for a standard-recovery silicon bridge and low enough that standby power in a continuously connected supply is negligible.