August 2017

Overvoltage protection

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). 

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)

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