This International Standard applies to non-linear metal-oxide resistor type surge arresters without spark gaps designed to limit voltage surges on a.c. power circuits.
DS/EN 60099-4:2005 history
2009DS/EN 60099-4/A2:2009 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
2007DS/EN 60099-4/A1:2007 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
2005DS/EN 60099-4:2005 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems