本指南适用于用于连接额定值为1000V RMS或以下的50Hz至60Hz交流电源电路的浪涌保护器（SPD）。 本指南描述了这些低压交流电源电路中发生的电力系统干扰对SPD的影响。这些干扰不仅限于浪涌。描述了SPD的存在和运行对连接负载可用电能质量的影响。还描述了同一电路上多个SPD之间的相互作用。本指南讨论了电压和电流浪涌。本指南中讨论的电流浪涌是电压浪涌的结果。 本指南中不讨论仅由负载变化引起且不会导致电压升高（如短路）的电流浪涌。SPD的主要用途是提供浪涌保护。本指南中讨论的设备至少包含一个用于转移浪涌电流和/或耗散浪涌能量的非线性组件，例如金属氧化物压敏电阻器（MOV）、硅雪崩二极管（SAD）、晶闸管或火花隙。在本指南中，不间断电源（UPS）、铁磁谐振器、电机发电机和仅包含电感和/或电容元件的滤波器不被视为SPD。

This guide applies to surge protective devices (SPDs) intended for connection to 50 Hz to 60 Hz ac power circuits rated 1000 V RMS or less. This guide describes the effects on SPDs of power system disturbances occurring in these low-voltage ac power circuits. The disturbances are not limited to surges. The effects of the presence and operation of SPDs on the quality of power available to the connected loads are described. The interaction among multiple SPDs on the same circuit is also described. This guide discusses both voltage and current surges. The current surges discussed in this guide are the result of voltage surges. Current surges that are solely the result of load changes and do not result in voltage increases, such as a short circuit, are not discussed in this guide. An SPD's primary purpose is to provide surge protection. Devices discussed in this guide contain at least one nonlinear component for diverting surge current and/or dissipating surge energy, such as a metal oxide varistor (MOV), silicon avalanche diode (SAD), thyristor, or spark gap. Uninterruptible power supplies (UPSs), ferroresonators, motor-generators, and filters containing only inductive and/or capacitive components are not considered SPDs in this guide.