Overvoltage protection with ThermoFuse Varistors

Beat the heat with EPCOS ThermoFuse varistors (ETFV) from TDK! These components protect household appliances and power supplies from overvoltages. This innovation integrates a disk varistor and a thermal fuse in a single packaged component. The thermal fuse is connected to a terminal lead of the disk varistor by a solder bridge. If a sustained supply-frequency overvoltage occurs, the disk varistor absorbs the surge voltage and heats up in the process. If the melting point of the fuse solder is exceeded, the fuse opens and the varistor is permanently disconnected from the power line. This disconnection ensures that the varistor is not overloaded and does not short. Article covers AdvancedD series for higher surge currents, Applications, Thermal triggering, Monitoring output for signal display, Wave soldering at 253oC, and Parameters of ETFV Variants.

Download data sheets at www.epcos.com/protection.