Engineered for heavy manufacturing and critical oil and gas operations, this robust three-phase backup system eliminates costly industrial downtime. It employs a sophisticated online double conversion topology, integrating a 32-bit DSP processor and IGBT-based multi-level conversion for exceptional power quality. Supporting a flexible 240/360/384 V DC nominal voltage, it delivers a precise 380/400/415V pure sine wave output with a 0.8 lag power factor. The unit effortlessly handles a 125% overload for 60 seconds and features a massive 200% short circuit capacity with a 0 msec changeover time. An inbuilt isolation transformer at the output provides uncompromising protection, shielding sensitive infrastructure from severe grid fluctuations. Operating at up to 94% AC-AC efficiency, it supports IoT-based remote monitoring via RS-232, GSM, or SNMP for continuous facility oversight. Housed in a floor-mounted enclosure up to 2.0 mm thick, this dependable unit guarantees uninterrupted energy for demanding steel plants and defense applications.