The R191-054-000 is an aluCASE enclosure from the R190-R191 Series (Watertight - Thick Wall Diecast Aluminum), a modern, high quality instrument enclosure made of die-cast aluminum. It suits OEM engineers housing small instrument and interface electronics in a compact footprint. With a depth of just 33 mm including the lid, it is one of the two slimmest sizes in the R190-R191 Series ordering table, and shares its 50 mm length with the R191-052-000 (50 x 75 x 33 mm).

The enclosure is made of diecast aluminum material (GD Al Si 12/DIN 1725) and finished in a textured RAL 7040 gray polyester powder coat; it can be supplied unpainted on special order. The lid is fastened with captive stainless steel lid screws and seals on a preformed TPE gasket that comes installed. A 1.7 mm recess is integrated in the lid for membrane keypads and front panels.

The R191-054-000 measures 1.97 in x 3.94 in x 1.3 in (50 mm x 100 mm x 33 mm) (length x width x height), with a 33 mm depth including the lid, and has a shipping weight of 0.45 lbs (0.20 kg). It is supplied in a box.

Installation is designed around the seal: the enclosure can be installed after closing the lid, because the internal mounting channels can be accessed with the lid closed, and all holes are outside of the gasket seal. Snap-in clip-on screw covers, made of RAL 7040 grey PMO plastic, hide both the lid screws and the installation holes. Optional-use lid captivation straps are included.

The part is listed as IP67 with NEMA ratings of 1, 4, 4X, 12 and 13; the series specifies a degree of protection of NEMA 4X, IP67 and is CSA and UL listed to Type 4. It is RoHS and REACH compliant.