The ABB 57330001‑Y DSBB110A is a master shield backplane module for ABB Advant Master legacy DCS automation systems. It delivers backplane bus electrical interconnection, realizes power distribution between internal rack boards and provides EMI electromagnetic shielding protection for the whole frame. Adopting euro‑card circuit structure, it suppresses field‑side surge interference and improves system anti‑interference performance for thermal power, chemical and pulp‑paper production workshops. Standard rack‑mount plug‑in installation supports convenient on‑site replacement to reduce unplanned downtime. Widely used for old‑generation DCS cabinet reconstruction and spare‑part stocking. As an essential vulnerable spare part for legacy automation hardware, each unit passes comprehensive full‑function testing before shipment for equipment overhaul and daily maintenance.