Epcos has developed new combined components of the ETFV (EPCOS ThermoFuse varistor) series to protect domestic appliances and switched-mode power supplies from surge voltages. They consist of a disk varistor and a thermo-fuse connected in series. Three types are available for leakage currents of 6 kA, 10 kA and 25 kA at a pulse of 8/20 μs in each case.
The thermo-fuse disconnects the varistor when it has been damaged by excessive leakage currents. This prevents excessive heating of the varistor and thus avoids the danger of fire. A monitor output positioned between varistor and fuse can be used to indicate a malfunction.
The components are designed for rated AC voltages of 130 V a.c. to 510 V a.c. and are UL 1449-approved.
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