B-Line SB5768140TG Eaton series open frame racks, Steel, Telco gray powder coat, 12-24 panel mounting holes, 49 mounting spaces, Top channel style, Seismic Zone 4, closed duct unequal flange rack

The SB5768140TG gives you 49 mounting spaces on the rails, so you can plan for 49U of panel, switch, and patch gear before you run out of room. It is a tall frame at 140 inches, so check your ceiling height, overhead cable runway, and any sprinkler clearance in the room before committing to it.

Rails are drilled and tapped for 12-24 panel mounting holes. If your patch panels, shelves, and equipment ears were previously screwed into 10-32 rails, you will need to swap to 12-24 screws and cage-nut-free hardware to mount them. 12-24 is the common telco standard for open frame relay racks.

The SB5768140TG is built as a Seismic Zone 4 rack, which is the highest of the legacy seismic zone classifications and the one that covers high-risk regions like much of California. It is also UL Listed. Zone 4 rating applies to the rack as anchored, so the floor anchorage and any overhead bracing still have to be installed per the engineer's detail for your building.

Closed duct means the rack uprights are formed as a closed channel, so vertical cable can be run inside the upright instead of strapped to the outside. Unequal flange means the two faces of the mounting flange are different widths, which lets you set equipment forward or back in the frame and gives you working room on one side for cable management. The SB5768140TG also uses a top channel style at the head of the frame for tying into overhead runway.

Overall frame width is 23 inches, which is the normal footprint for a relay rack carrying 19 inch EIA panels, since the uprights sit outboard of the panel face. Plan your floor layout on 23 inches plus whatever aisle and vertical manager width you need between bays.

Open frame, not a cabinet. There are no side panels, no doors, and no locking front, so equipment is fully exposed and accessible from all four sides. That is what you want in a secured telecom or MDF room where airflow and cable access matter more than physical security. If the room is not access-controlled, an enclosed cabinet is the better choice.

Order it as B-Line SB5768140TG. That single manufacturer part number covers the 140 inch tall, 23 inch wide, Telco gray, 49 space Seismic Zone 4 closed duct frame with 12-24 rails. Floor anchors, vertical cable managers, and any overhead runway hardware are separate items.

The frame itself is 137 pounds of steel, empty. That is a two-person lift to stand it up, and you should figure equipment and cable weight on top of it when you look at floor loading or a raised floor stringer layout.

It is finished in Telco gray powder coat over steel, the standard color for telecom relay racks, so it will line up visually with most existing gray B-Line and telco-style bays in a main distribution frame. Powder coat over steel also holds up to rack screws being driven and removed repeatedly.