The ABB 48980001‑P DSSB140 is a dedicated battery backup unit for ABB Advant Master and AC800M DCS control systems. It provides temporary backup power supply when main power fails, protecting controller runtime data and preventing unexpected system crash. Equipped with built‑in battery management circuit, it realizes over‑charge, over‑discharge and short‑circuit protection functions. Compact metal housing adapts to harsh industrial cabinet environments. DIN‑rail mounting design supports quick on‑site replacement to cut unplanned downtime. Status indicator LEDs display power and battery working conditions. Widely deployed in thermal power, chemical and pulp‑paper process automation cabinets. As a key vulnerable spare part for legacy DCS hardware, each unit passes comprehensive full‑function testing before shipment for equipment overhaul and system maintenance.