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Varistors With Increased Permissible Operating Temperature


TDK Corporation presents leaded EPCOS metal oxide disk varistors, which have now been approved for an increased operating temperature of 105 °C (previously 85 °C). The reason for this is the recertification of the B722* series of varistors in accordance with UL 1449, 4th Edition, and IEC 61051. Raising the permissible operating temperature to 105 °C also changes the climate category from 40/85/56 to 40/105/56. The flammability of the epoxy enclosure complies with UL 94 V-0. The monolithic EPCOS varistors are available with rated voltages of between 11 Vrms and 1100 Vrms and, depending on type, can withstand surge currents of up to 20 kA (8/20 µs).  


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