https://www.en-standard.eu/bs-en-iec-61051-1-2018-varistors-for-use-in-electronic-equipment-generic-specification/
BS EN IEC 61051-1:2018 Varistors for use in electronic equipment Generic specification
BS EN IEC 61051-1:2018 Varistors for use in electronic equipment Generic specification, Category: 31.040.99 Other resistors