ABB ACS480-04-25A0-2+K491 ACS480-04-25A0-2 ACS480 drive with Modbus TCP. ABB ACS480-04-25A0-2+K491 is an ACS480 general-purpose drive rated 200-240 V AC, three-phase, factory configured with Modbus TCP communication (FMBT-21). It is suitable for pumps, fans, compressors, conveyors and OEM control panels requiring direct PLC or industrial-network integration.