B-Line Eaton series open racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 50 mounting spaces, Top angle style, Seismic Zone 4, close

The SB5769090TG is a 23 inch wide open frame rack with 12-24 tapped panel mounting holes, which is the telecom standard for 23 inch panel mounting rather than 19 inch EIA gear. Equipment panels drilled for 23 inch mounting bolt straight up with 12-24 screws; 19 inch switches and servers need 19-to-23 inch adapter brackets to land on these rails.

Yes. The SB5769090TG is built as a Seismic Zone 4 closed duct unequal flange rack in 6 gauge steel, which is why it comes in at 121 lb for a single frame. It is also UL Listed. For the seismic rating to hold in the field the base still has to be anchored to the slab and the top braced per the engineer's detail.

Open frame. The Eaton B-Line SB5769090TG is a four-post-free open relay rack with 12-24 tapped uprights, no doors, no side panels and no locking enclosure. If the equipment needs physical security, airflow containment or dust protection, an enclosed cabinet is the right call instead. Open frame is chosen where cable access from all sides and convection cooling matter more.

Fifty mounting spaces over a 90 inch tall frame. That is rack units of usable panel space top to bottom, so it covers a full frame of patch panels, fiber housings and active gear without needing a second rack for overflow.

Unequal flange means the two legs of the upright channel are different widths, so one face is deeper than the other. The wider flange gives you more room for vertical cable managers, ladder rack drops and duct on the cable side while the narrower face carries the equipment panels. On the SB5769090TG that pairs with a closed duct upright, so cable can be run inside the channel rather than only on the outside.

This one is the top angle style already, so the frame is configured with the angle at the top for tying in overhead ladder rack and auxiliary framing channel. You do not need to add a separate top plate kit to land a runway.

Telco gray powder coat is the industry standard rack color, so the SB5769090TG lines up with existing Telco gray frames, ladder rack and cable management in most central offices and MDF rooms. The powder coat over steel also holds up better to scuffing during equipment installs than a painted finish.

Plan on two people. The frame weighs 121 lb and stands 90 inches tall, so standing it up and holding it plumb while the base anchors go in is a two-man operation. Because it is a 6 gauge seismic frame it is heavier than a light-duty relay rack of the same height.