The Molex Beau 38780 387800104 is a 4-circuit barrier strip terminal block from the Beau 38780 series, built for chassis or panel mounting with a closed bottom and screw top termination. It carries a 0.438" (11.12 mm) pitch between terminals, dual-wall barriers that separate adjacent circuits, and a black UL94 V-0 thermoplastic housing. This is the kind of block you spec into a power distribution point inside an enclosure — a control cabinet, a junction box, a piece of industrial machinery — where you need a field-serviceable screw clamp for 14-22 AWG wire and the physical isolation that a dual-wall barrier gives you between circuits.
Ratings That Matter for Fit
Rated 15 A at 300 V, with the 0.438" (11.12 mm) pitch giving enough creepage distance to hold that voltage rating across the barrier walls. The 15 A per circuit is the limiting number for a power tap — each screw clamp can carry a motor branch or a heater load at that current, but the total block dissipation is the sum of all four circuits, so keep the enclosure ventilation in mind. The 14-22 AWG wire range covers most panel-building gauges; the steel screws with zinc clear chromate finish give a corrosion-resistant clamp that stays tight under thermal cycling.
The 387800104 is the 4-circuit member of the Beau 38780 family. The closest functional sibling is the 387800105, which is the 5-circuit version at the same 0.438" (11.12 mm) pitch, same 15 A / 300 V rating, same dual-wall barrier, same chassis mount. The only decision-relevant difference is the circuit count — 4 versus 5 — which means the 387800104 is a shorter block by one terminal position. If your panel layout has a 4-position cutout and a 4-circuit BOM line, this is the one. If you need a fifth terminal, step to the 387800105; the footprint, wire range, and termination are otherwise identical.