What it is
The Molex 391002203 is the 3-circuit member of the Eurostyle 39100 series barrier terminal strip family, rated 40 A per circuit at 600 V in an enclosed dual-row layout that mounts directly to chassis or panel. Screw-top termination accepts 8-20 AWG conductors, with zinc-plated steel terminal screws clamping over the wire — the barrier wall keeps adjacent terminations isolated and the closed bottom prevents异物 under the strip.
Key ratings and what they mean for the fit
Pitch is 0.472 in (12.00 mm), which sets the centre-to-centre spacing and the panel cutout footprint — important for matching an existing chassis opening or routing a new one. The 40 A per-circuit rating handles moderate power distribution; at 600 V it covers most industrial AC and DC bus applications up to that voltage ceiling. The enclosed barrier construction adds arc suppression compared to an open strip — give it spacing or it'll track under high humidity or contamination. Flammability is UL94 V-0, so it is acceptable inside most industrial enclosures without additional fire sleeving. Operating range is -40°C to 105°C, wide enough for unheated outdoor enclosures. The white PA66 housing is the standard colour for this series and carries no functional implication.
Where this class is used
Eurostyle 39100 barrier strips are a common panel-wiring solution in industrial automation, motor drives, and power distribution panels — anywhere a field technician needs a visible, torquable connection point for ring or spade lugs without a crimp tool on hand. The screw-top design makes field re-termination straightforward and the enclosed barrier keeps the strip safe in dusty or damp environments.
Does it drop into a panel specified around the 0391002502?
No. The 0391002502 is a 2-circuit member of the same Eurostyle 39100 series but carries a 15.00 mm pitch — wider than the 12.00 mm pitch of the 391002203. The different centre-to-centre spacing means the mounting holes and panel cutout do not align; a board or chassis laid out for the 15 mm part will not accept the 12 mm part without re-drilling. Similarly, the 0391002012 is a 12-circuit member at 10.00 mm pitch and 30 A rating — a completely different circuit-count and footprint class. The 391002203 does not cross into either sibling's panel footprint.
Lifecycle and sourcing
The 391002203 is Active and ROHS3 Compliant — quoted to order against BOM quantity. No official successor or cross-reference is listed in the evidence. The series, pitch, circuit count, and 40 A rating are all on record; confirm the mounting hole pattern and panel thickness before committing to the BOM line. Sourced per RFQ.