RFS Shielded Power Inductors Coilcraft RFS Shielded Power Inductors are high current power inductors with an inductance range of 6.8µH to 10mH. These Coilcraft inductors offer current ratings up to 9.1A and are ideal for use in a variety of choke applications. RFS ferrite core inductors have an ambient temperature rating of -40°C to +85°C with Irms current or +85°C to +125°C with derated current.