B-Line Eaton series open racks, Steel, Telco gray powder coat finsh, 48-11/16", Self-supporting relay rack, 11 gauge, ASTM A570

Yes. The Eaton B-Line SB5563084FB is a Seismic Zone 4 rated closed duct, unequal flange relay rack, so it can be specified where a facility's structural requirements call for Zone 4 seismic anchorage. It is also UL Listed. Because seismic performance depends on being fastened as designed, plan on anchoring the base to the floor rather than free-standing it.

The frame weighs 91 lb on its own. That is a two-person lift to stand upright and align to floor anchors, and the weight is worth noting for freight elevator and rooftop or raised-floor loading calculations before the gear goes in.

Formed from 11 gauge steel to ASTM A570. That is the heavier end of open-frame relay rack construction, which is what supports the Seismic Zone 4 rating and makes it suitable for loaded switch, patch, and relay equipment rather than light patch-only duty.

An open frame rack like the SB5563084FB gives access to both sides of mounted gear and lets cable drop straight in from overhead tray, which is why it is the default in dedicated, access-controlled telecom and MDF rooms. Choose an enclosed cabinet instead when the equipment sits in a shared or public space and needs physical security, or when you need airflow containment and door-mounted fans. This is a self-supporting rack, so it does not require wall or overhead bracing to stand, but it should still be floor anchored for the seismic rating to mean anything.

Yes, the rack is a top angle style frame, so the upper cross member is included as part of the structure. Vertical or horizontal cable management, ground bars, and overhead ladder rack runway are separate items and need to be ordered with it if the room build requires them.

Closed duct means the upright channels are formed into a closed section rather than an open C, which adds torsional stiffness under load. Unequal flange means the two flanges of the upright are different widths, giving a deeper mounting face on one side for equipment and hardware while the other side keeps the profile tight to the cable path. Both are structural traits of the SB5563084FB upright, not accessories.