The ABB 3ADT218042S0134 is a DC converter rated 2500 A at 690 VAC input, 50 Hz, in frame H7. It is a 2-quadrant regenerative unit for large DC motor drives.
The 2500 A at 690 VAC is the continuous rated output current for the DC side, not a surge rating. That drives the AC supply cable sizing and the DC busbar cross-section — expect M12 or larger studs on the H7 frame. The 2Q topology means it handles motoring and regenerative braking in one direction; if you need reversing, you add a separate contactor or a 4Q unit. Three analog inputs and two analog outputs are onboard for speed reference, current feedback, or external setpoint — enough for a standalone drive without an extra I/O module. The 75 dB(A) sound level is the fan noise at full load; H7 frame uses forced air, so account for that in a quiet control room or near operator stations. IP00 on the auxiliary terminals means the power terminals are open — no finger-safe shrouds. The unit itself is typically IP20 or IP00 depending on the enclosure kit. Plan for a separate enclosure or at least a barrier guard in the panel. Operating humidity range 5...95% RH covers most indoor industrial environments without derating, but condensation protection is on you — the drive isn't sealed.
Where you'll see it
DC converter for large DC motor drives — extruders, winders, crushers, mill drives, crane hoists. The 2500 A frame H7 is common on DC motor applications at 690 VAC supply.