AS 60099.4:2022 adopts IEC 60099-4:2014 with modifications for Australia, which presents the minimum criteria for the requirements and testing of nonlinear metal-oxide resistor type surge arresters without spark gaps designed to limit voltage surges on a.c. power circuits with Us above 1 kV.
AS 60099.4:2022 history
2022AS 60099.4:2022 Surge arresters, Part 4: Metal-oxide surge arresters without gaps for a.c. systems (IEC 60099-4:2014 (ED. 3.0) MOD)