B-Line Eaton series open racks, Aluminum, Rack width 23, Mounting spaces: 56, Telco gray powder coat, Self-supporting aluminum relay rack

The Eaton B-Line SB558108UTG is a 23 inch rack, not a 19 inch EIA rack. Its rails are drilled on 23 inch centers, which is the telecom standard used for transmission and switching gear. Standard 19 inch servers, switches and patch panels will not mount directly to it, so you either specify a 19 inch rack or use 23-to-19 inch adapter brackets on each piece of gear.

Weight is the difference. This B-Line frame is aluminum and steel construction and weighs 39 lb, so one person can carry and stand it, which matters in retrofit closets and upper floors with no equipment lift. Steel racks are heavier but carry more load, so for dense battery, power or heavy switching gear a steel frame is the better call. For patch panels, blocks and light transmission equipment, aluminum is the usual choice.

Plan on 23 inches of width per frame, and allow front and rear working clearance since this is an open frame accessed from both sides. Racks in a lineup are normally bolted together side by side through the channel, so the footprint grows in 23 inch increments. Door swings and egress aisle widths in your room are what usually decide the final layout.

No. The SB558108UTG is the open relay rack frame only. Vertical cable management channels, horizontal wire managers, shelves, power strips and grounding bars are all ordered separately, and you will also need floor anchors for the base since fastening hardware depends on your slab or raised floor.

Telco gray powder coat, which is the standard color for central office and telecom equipment frames. If your existing lineup is telco gray B-Line or comparable relay racks, this will read as a match. It is one model and one finish, so there is no black or clear anodized option to specify.

Certifications are listed as Not Applicable for this open frame rack, so treat it as an unlisted structural frame rather than a listed electrical assembly. Where a listing is required in your facility, that requirement normally attaches to the equipment and power gear mounted in the rack, not the frame itself.