... power supply, ballast / CFL etc. and the heating loop of CRT of color TV / monitor, heater, filament etc. The WMF21 series complies with ... is mainly used in Switching Power Supply, UPS Power Supply, CFL, Ballast, Circuitry of Power Supply, etc.WMF21 series NTC ... power supply, ballast / CFL etc. and the heating loop of CRT of color TV / monitor, heater, filament etc. The WMF21 series complies with ...