IEC 61643-31:2018适用于浪涌保护装置（SPD），用于对雷电或其他瞬态过电压的间接和直接影响进行浪涌保护。这些设备设计用于连接到额定值高达1500 V DC的光伏装置的直流侧。这些设备至少包含一个非线性组件，旨在限制浪涌电压和分流浪涌电流。建立了性能特征、安全要求、测试和评级的标准方法符合本标准的SPD专门安装在光伏发电机的直流侧和逆变器的直流侧。 不包括带有储能装置的光伏系统（如电池、电容器组）的SPD。不包括带有单独输入和输出端子的SPD，这些端子之间包含特定的串联阻抗（根据IEC 61643-11:2011，称为双端口SPD）。符合本标准的电涌保护器设计为永久性连接，固定电涌保护器的连接和断开只能使用工具完成。本标准不适用于便携式SPD。

IEC 61643-31:2018 is applicable to Surge Protective Devices (SPDs), intended for surge protection against indirect and direct effects of lightning or other transient overvoltages. These devices are designed to be connected to the DC side of photovoltaic installations rated up to 1 500 V DC. These devices contain at least one non-linear component and are intended to limit surge voltages and divert surge currents. Performance characteristics, safety requirements, standard methods for testing and ratings are established.？ SPDs complying with this standard are exclusively dedicated to be installed on the DC side of photovoltaic generators and the DC side of inverters. SPDs for PV systems with energy storage (e.g. batteries, capacitor banks) are not covered. SPDs with separate input and output terminals that contain specific series impedance between these terminal(s) (so called two-port SPDs according to IEC 61643-11:2011) are not covered. SPDs compliant with this standard are designed to be permanently connected where connection and disconnection of fixed SPDs can only be done using a tool. This standard does not apply to portable SPDs.