IEC 61643-41:2025适用于针对闪电或其他瞬态过电压的间接和直接影响的电涌保护装置。 这些设备旨在连接到额定电压高达1 500 V DC的DC电源电路和设备。本文件规定了性能和安全要求、测试和评级。这些器件包含至少一个非线性元件，旨在限制浪涌电压和转移浪涌电流。 本文档提供的测试要求基于这样的假设:SPD连接到由提供线性电压-电流特性的电源供电的DC电源电路。当SPD要连接到不同类型的电源时，需要仔细考虑。这主要适用于在这种系统中预期的系统和故障条件（例如。g.预期短路电流，TOV-应力）。 当该领域或某些应用不存在相关产品标准时，本文件可适用于铁路应用。 根据风险评估，可能没有必要将本文件的所有要求应用于仅为特定电源应用而设计的SPD，例如低功率容量电路、由非线性电源供电的电路、与公用电源有保护隔离的电路。 注1？有关风险评估的更多信息见IEC指南116。 本文件不涵盖光伏应用的SPD。 注2？IEC 61643-31涵盖了用于PV应用的此类SPD。 注3？基于国家法规的其他排除也是可能的。 本国际标准将与IEC 61643-01一起使用。

IEC 61643-41:2025 is applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages.
These devices are intended to be connected to DC power circuits and equipment rated up to 1 500 V DC. Performance and safety requirements, tests and ratings are specified in this document. These devices contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents.
The test requirements provided by this document are based on the assumption that the SPD is connected to a DC power circuit fed by a power source providing a linear voltage-current characteristic. When the SPD is to be connected to a different kind of source, careful consideration is required. This mainly applies with regard to system and fault conditions to be expected in such a system (e.g. expected short circuit current, TOV-stresses).
This document can apply for railway applications, when related product standards do not exist for that area or for certain applications.
Based on a risk assessment it might not be necessary to apply all requirements of this document to SPDs designed for specific power applications only, e.g. circuits with a low power capability, circuits supplied by nonlinear sources, circuits with protective separation from the utility supply.
NOTE 1？More information on risk assessment is provided in IEC Guide 116.
SPDs for PV applications are not covered by this document.
NOTE 2？Such SPDs for PV applications are covered by IEC 61643-31.
NOTE 3？Other exclusions based on national regulations are possible.
This International Standard is to be used in conjunction with IEC 61643-01.