IEC 61643-12:20 20描述了连接到50/60 Hz交流电源电路和额定高达1 000 V RMS的设备的SPD的选择、操作、位置和协调原则。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。 注1如果需要，特殊应用的附加要求也适用。 注2 IEC 60364和IEC 62305-4也适用。 注3本标准仅涉及SPD，不涉及集成在设备内部的电涌保护组件（SPC）。 这第三版取消并取代了2008年出版的第二版。本版构成技术修订版。 请注意，美国存在以下不太永久性的不同做法:在美国，不需要经过I级测试的SPD。此例外适用于整个文档。与上一版相比，此版本包括以下重大技术变更: a）范围:删除对1 500 V dc的引用 b)增加或修订了一些定义 c)新增关于保护需要的第4条 d）增加了有关断开设备的新信息 e)修订后的SPD特性 f)用于SPD选择的修订参数列表 g）增加了关于测量极限电压的新信息 e)增加或修订了一些附件

IEC 61643-12:2020 describes the principles for the selection, operation, location and coordination of SPDs to be connected to 50/60 Hz AC power circuits, and equipment rated up to 1 000 V RMS. These devices contain at least one non-linear component and are intended to limit surge voltages and divert surge currents.
NOTE 1 Additional requirements for special applications are also applicable, If required.
NOTE 2 IEC 60364 and IEC 62305-4 are also applicable.
NOTE 3 This standard deal only with SPDs and not with surge protection components (SPC) integrated inside equipment.
This third edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision.
NOTE The following differing practice of a less permanent nature exists in the USA: In the USA, SPDs tested to Class I tests are not required. This exception applies to the entire document. This edition includes the following significant technical changes with respect to the previous edition:
a) Scope: Deleted reference to 1 500 V dc
b) Added or revised some definitions
c) Added new clause 4 on Need for protection
d) Added new information on disconnecting devices
e) Revised Characteristics of SPD
f) Revised List of parameters for SPD selection
g) Added new information on Measured Limiting Voltage
e) Added or revised some Annexes