What it is
The Molex 391001906 is a 6-circuit dual-row Eurostyle 39100 series enclosed barrier terminal strip with a 0.315-inch (8.00 mm) pitch and screw-top closed-bottom termination. Rated 20 A per circuit at 300 V, it accepts 12–22 AWG wire and mounts to chassis or panel. The insulation body is polyamide (PA66/Nylon 6/6) rated UL94 V-0 across an operating range of -40°C to 105°C, and the terminal screws carry a zinc finish over steel.
What the ratings mean
The 20 A per circuit rating is governed by the 12–22 AWG wire gauge range — the conductor, not the contact, is the current ceiling at full load. The 300 V rating is the voltage-withstand limit for this series member; the 10.00 mm pitch 0391002012 peer carries a 600 V rating, so verify the circuit voltage before cross-sourcing. The dual-row layout with enclosed barrier construction provides dead-front protection at the termination face — suited for field wiring in industrial enclosures where finger safety at exposed terminals matters.
Same series, different circuit count
The 0391002012 carries 12 circuits at a 0.394-inch (10.00 mm) pitch with 30 A at 600 V — the footprint spacing and voltage rating are both higher. A panel cutout keyed for the 10.00 mm pitch will not accept the 8.00 mm pitch 391001906 without rewiring the bus bar layout. The 0391002502 is a 2-circuit 63 A member at 15.00 mm pitch — a different scale entirely for power feed-through rather than signal distribution. The 6-circuit 391001906 sits in the mid-density range of the series; match the position count to your circuit count before specifying.