V320LA40B
http://www.littelfuse.com/data/Data_Sheets/LA.pdf

ERZV05D221
http://www.panasonic.com/industrial/components/pdf/awa0000ce2.pdf

EPCOS MOV page:
http://www.epcos.com/web/generator/Web/Sections/ProductCatalog/NonlinearResistors/Varistors/MonlithicAndLeadedVaristors/Page,templateId=render,locale=en.html