What the frame size tells you
The 3BBR0000123755: Frame Size R2 defines the mechanical envelope and thermal capacity of this drive. It governs the mounting footprint, the gland-plate layout, and the minimum panel volume for heat dissipation. If your cabinet layout was drawn around an R2 drive, this module drops in without rework — the bus-bar positions and cooling duct align to the R2 standard.
Listed as active and current, this is not a phase-out or NRND part. No PCN or LTB has been issued for this order code. For procurement, it means the part is factory-supported, the firmware revision is the latest production release, and the supply chain is standard — no broker or surplus channel needed. Submit an RFQ for firm pricing and lead time against your quantity.