TDK overvoltage protection: Varistors with increased permissible operating temperature
Tomáš Zedníček
Posted On 9.8.2017
source: TDK news
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). To assist in the design process, PSpice libraries are available under www.epcos.com/tools_mlv .
The varistors are 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)
