Historical
IEC 61051-1 Ed. 2.0 en:2007
Varistors for use in electronic equipement - Part 1: Generic specification
"It is applicable to varistors with symmetrical voltage current characteristics for use in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications for Qualification Approval and for Quality Assessment Systems for electronic components."
International Electrotechnical Commission [iec]