... .NTC thermistors for limiting of Inrush current. 2.UL approved 3.CQC approved 4.Best seller 5.Wide applied. WMF21 series ... type products, it has the characteristic of small bulk, high power, strong limiting of inrush current, quick response, long life, ... area, which is mainly used in Switching Power Supply, UPS Power Supply, CFL, Ballast, Circuitry of Power Supply, etc.WMF21 series NTC thermistors ...