The 3ADT218518S0111 is an ABB DCS880-S01-0020-04 DC converter — a 2-quadrant unit rated for 400 VAC input and 20 A output, built in frame size H1. It carries three analog inputs and two analog outputs, runs on a 50 Hz supply, and is specified for 5 to 95% RH ambient humidity. The auxiliary terminals are IP00 per IEC 60529 and IEC 60947-1, so panel builders should plan for additional enclosure protection if the environment demands it.
The 20 A output current and 400 VAC input define the DC bus capacity — sized for a motor or process load within that envelope. The 55 dB(A) sound level is moderate — audible in a quiet control room but unremarkable on a plant floor. Three analog inputs and two analog outputs give basic process I/O for speed or torque reference and feedback; no fieldbus slice is built in, so any network integration (PROFINET, EtherNet/IP) requires an external option module.