... loop of every kinds of power supply, ballast / CFL etc. and the heating loop of CRT of color ... mainly used in Switching Power Supply, UPS Power Supply, CFL, Ballast, Circuitry of Power Supply, etc.WMF21 series NTC ... loop of every kinds of power supply, ballast / CFL etc. and the heating loop of CRT of color ... in Switching Power Supply, UPS Power Supply, CFL, Ballast, Circuitry of Power Supply, etc.