What this strip is
The Molex 391002503 is the 3-circuit member of the Eurostyle 39100 series — an enclosed-barrier terminal strip rated 63 A per circuit at 600 V, accepting 6-14 AWG conductors under zinc-plated steel screws on a 0.591-inch (15.00 mm) pitch. The white polyamide (PA66) body carries a UL94 V-0 flammability rating and operates from -40°C to 105°C, making it suited for panel and DIN-rail wiring cabinets in industrial automation, power distribution, and fixed-installation harness work where a visible, front-screw accessible barrier block is the standard format.