Circuit & System Protection


High-temperature MOVs

13 September 2017 Circuit & System Protection

TDK has introduced 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.

For more information contact Deon Schoombee, Electrocomp, +27 (0)11 458 9000, deon@electrocomp.co.za, www.electrocomp.co.za



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