The FRN3.7G1S-4C is a Fuji Electric Frenic-Mega Series inverter rated for a 3.7 kW motor on a 400 V three-phase supply. The G designation means it is a high-performance, multifunction drive — the standard choice for general-purpose variable-torque and constant-torque loads. The C enclosure variant provides two analog outputs and is configured for the Chinese market, so verify the instruction manual language and any local compliance markings before panel integration.
Panel fit note
The C enclosure means two analog outputs are available for speed feedback or process-value retransmission; the Chinese destination manual indicates the default parameter set and display language may differ from the global version. If your panel was originally specified around the larger FRN37G1S-4C (37 kW, basic IP20 enclosure), the FRN3.7G1S-4C is a different frame size and power stage — it will not drop in without rewiring and a mechanical adaptor. Stick with the same power class when swapping.