The FRN0.4C1S-4J: Because the part is current, sourcing is straightforward: submit an RFQ with your quantity and target delivery window. The supply chain for this Fuji Electric series is mature, and lead times are typically quoted against the order, not speculative.
As a voltage inverter in the Power Supply Systems category, the FRN0.4C1S-4J converts a fixed DC input into a variable-frequency AC output to control the speed of a standard three-phase induction motor. In a panel, it occupies the drive slot between the DC bus supply and the motor terminals. The 0.4 kW rating places it in the micro-drive class — sized for small pumps, fans, conveyors, or spindle motors where the load is under half a kilowatt. It is not a general-purpose power supply; it is a motor speed controller.