What this part is
The Molex 387600303 is the 3-circuit member of the Beau 38760 dual-wall barrier terminal strip series. It is a two-row barrier block with a 0.375 inch (9.53 mm) pitch, rated 15 A per circuit at 300 V, and built for chassis or panel mounting with a flange feature. Wire termination is top-entry screws with a captive plate, accepting 14–22 AWG conductors into six wire entry positions — two per circuit — and the bottom is closed, meaning no standoffs or underside access on the panel side.
What the ratings mean for the panel fit
The 15 A per circuit rating with 14–22 AWG wire acceptance positions this block in the medium-power panel wiring range — it handles branch circuits and control power distribution. The captive plate on the screw termination is the detail that matters in the field: it keeps the wire from being pushed through the barrel when the screw is tightened, which is the most common installation failure on barrier strips without this feature. The black thermoplastic housing carries a UL94 V-0 flammability rating, which satisfies the material requirement in most industrial panel enclosures without needing a separate fire-barrier treatment. The zinc clear chromate finish on the terminal screws provides corrosion resistance in controlled indoor environments; for washdown or chemically exposed panels the spec sheet will confirm whether the finish grade is sufficient for that condition.
Where barrier blocks like this are used
Barrier terminal strips in the 15 A class are the workhorse of industrial control panels — they distribute power and signal commons across DIN rail-adjacent or direct-panel wiring schemes, often in motor drives, PLC distribution, and industrial automation enclosures. The dual-wall barrier construction adds mechanical separation between adjacent circuits, reducing the risk of a short under vibration or thermal cycling. The flange mount makes it suitable for direct attachment to a panel face or enclosure wall without a DIN rail footprint.
How it compares to a Eurostyle 39100 peer
The 0391002012 and 0391002502 in the Eurostyle 39100 series are rated at 600 V — twice the voltage class of the 387600303 — with current ratings of 30 A and 63 A respectively. The 0391002012 is a 12-circuit enclosed barrier at 0.394 inch pitch; the 0391002502 is a 2-circuit block at 0.591 inch pitch. Neither is a drop-in replacement: the pitch, voltage rating, circuit count, and form factor all differ. They serve higher-power panel wiring applications, not the same BOM positions as this 3-circuit Beau block.