What it is and where it sits in the series
The Molex 391002310 is the 10-circuit member of the Eurostyle 39100 dual-row barrier terminal strip family, with a 0.472 inch (12.00mm) pitch and a 40A per-circuit current rating at 300V. The enclosed barrier construction routes two rows of screw-clamp terminations side by side across the white PA66 housing, with a closed bottom that prevents debris ingress from the panel side. The series covers a range of circuit counts and pitch options — the 0391002012 runs at 10.00mm with 30A per circuit, while the 0391002502 uses a wider 15.00mm pitch and is rated 63A for heavier wire. This puts the 391002310 in the mid-range pitch position at 12.00mm with a 40A rating that sits between those two siblings.
What the ratings mean for your selection
The 40A per-circuit rating assumes the ambient inside the cabinet stays within the derating curve for the PA66 housing material — the housing limits the terminal to 105°C, which gives headroom above typical conditions, but derate further if the enclosure runs hot or the terminals are densely populated without airflow gaps between circuits. The 300V rating is lower than the 600V available on the two same-series peers — this is a significant delta if the application runs close to medium-voltage levels. The 8-20 AWG wire acceptance range is wide enough for power distribution branch circuits but note that the 40A rating at the upper end of that wire range will run the terminal at or near its thermal limit — use 10-12 AWG minimum for sustained full-load operation to keep the screw clamp within its designed grip window. The dual-row layout with enclosed barrier gives good finger protection in a panel-mount context, and the zinc-plated steel terminal screws with steel screw material provide adequate clamping force for 8-20 AWG. The UL94 V-0 flammability rating on the PA66 housing confirms it meets the self-extinguish requirement for enclosed equipment — confirm this satisfies the specific UL/IEC flammability class your end equipment requires.
Where the class is used
Eurostyle barrier terminal strips of this type are used as board-to-wire and panel-to-wire power interconnect points in industrial automation panels, motor drives, HVAC controls, and power distribution units. The screw-clamp top termination with a closed bottom suits panel and DIN mounting where you need a visible, accessible, and manually wired distribution node. The enclosed barrier is preferred in applications where operator contact with live terminals is a risk or where panel clean-down exposes the strip to debris.
Sourcing and lifecycle
The 391002310 is listed Active and ROHS3 Compliant — quoted to order against BOM quantities. No official successor or cross-reference is on record for this part number. Confirm the 10-circuit position count matches your panel layout before committing, and verify that the 300V rating covers the full nominal system voltage including any transient peaks.