What this FRENIC drive is and what it's sized for
The Fuji FRN0.4E1S-4C is a FRENIC Series high-performance inverter rated for a 0.4 kW nominal motor on a three-phase 400 V supply. The "E" in the order code marks it as the high-performance/compact variant of the FRENIC family, so it's built for applications that need tighter speed regulation or more torque at low speeds than a general-purpose drive would deliver. The "S" enclosure is the standard IP20 build — meaning it's meant for a clean, dry cabinet, not a washdown or outdoor location.