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TDK TDK Electronics · TDK Europe

Overvoltage protection

August 8, 2017

Varistors with increased permissible operating temperature

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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). 

The varistors are very well suited for the protection of power supply and converter inputs for industrial electronics applications, as well as household appliances and telecommunication devices.

Main applications

  • Power supplies and converters for industrial electronics applications, as well as household appliances and telecommunication devices. 

Main features and benefits

  • Increased permissible operating temperature of 105 °C
  • Wide range of rated voltages from 11 VRMS to 1100 VRMS
  • High surge current capability of up to 20 kA (8/20 µs)