What this is
The Molex 387800310 is the 10-circuit member of the Beau 38780 dual-row barrier block series, rated 15 A per circuit at 300 V with a pitch of 0.438" (11.12 mm). Black thermoplastic housing, UL94 V-0 flammability rating, zinc-clear-chromate terminal screws. Top termination is screws with a captive plate; bottom is closed. Accepts 14–22 AWG wire across 20 entry points — two per circuit. Chassis or panel mounting with a flange feature.
Fit check for your BOM
The 0.438" (11.12 mm) pitch is tighter than the Eurostyle 39100 12-circuit member at 0.394" (10.00 mm) and wider than its 2-circuit sibling at 0.591" (15.00 mm) — neither is a drop-in panel swap. If the panel was predrilled for a Eurostyle strip, the 387800310 will not land without rework. The 15 A per-circuit rating at 300 V is well below the 600 V ceiling of the Eurostyle peers — confirm voltage is not the constraint driving the original spec. The 10-circuit dual-row layout gives 20 wire entries; the Eurostyle 39100 12-circuit peer offers 24 entries at a narrower pitch — more circuits but a different footprint.