The 1590Z231PL is the optional inner mounting panel for the 200 x 230 x 110 mm 1590Z231 diecast aluminum enclosures, including 1590Z231BK (black) and 1590Z231GY (gray). It provides a removable steel plate for mounting circuit boards and components so the assembly can be built and wired outside the box.

The panel is 16 gauge galvanized steel. The part page lists 8.47 in x 7.28 in x 0.06 in (215 mm x 185 mm x 2 mm); the drawing shows the 215.01 x 185.01 mm outline with R13.00 corner radii, which matches the enclosure's listed maximum P.C. board size of 185.01 x 215.01 mm.

It seats on the enclosure's internal mounting shelf, and the series ordering table pairs it with SCGM6-20 extra panel screws. Shipping weight is 1.26 lbs (0.57 kg), packed in shrink wrap.

The drawing notes that enclosures can be factory modified (milling, drilling, printing etc.) and that solid models are available in STEP or IGES. The 1590Z231PL is RoHS and REACH compliant. Its parent enclosure is cUL and UL listed, rated IP68 and NEMA 4, 4X, 6, 6P, 12 & 13, and has an inside depth of 101.50 mm per the enclosure drawing, so components on the panel sit within a sealed, thick wall housing.