EPCOS uses AdvanceD Series disk Varistors for its ETFV ThermoFuse varistors. This series is distinguished by absorbing up to 33% higher surge currents than standard disk varistors of the same diameter. The product range comprises disks of the 14mm, 20mm, and 25mm series. The ETFV25 series can even absorb surges up to 20 kA in an 8/20 µs pulse.