The FRN0018F2S-4C is a Fuji Electric FRENIC Series High Performance Inverter, rated for three-phase 400V supply. The 'S' enclosure designation indicates basic type with IP20/IP00 protection — open-chassis style for panel mounting where the cabinet provides the environmental seal. The amperage rating code 0018 corresponds to the drive's output current capacity for motor control.
The FRENIC series is Fuji's high-performance drive family, designed for general-purpose motor speed control in industrial applications. The three-phase 400V input makes it suitable for standard European and Asian industrial mains.