新的IEEE标准-非活动撤销。 本标准涵盖手动或电动的封闭式低压交流电源电路保护器。本文介绍的是固定式电路保护器，具有2极或3极结构，一个或多个额定最大电压为508 V和254 V rms，适用于标称电压为480 V和240 V rms的系统。考虑的电路保护器配有限流熔断器，因此整个装置适用于能够提供不超过200000 A rms对称短路电流的电路。讨论了使用条件和额定值，并描述了电路保护器的功能部件。包括温度限制和绝缘材料的分类。规定了绝缘（电介质）耐受电压要求，并给出了应用指南。 还规定了试验程序。

New IEEE Standard - Inactive-Withdrawn. This standard covers enclosed low-voltage ac power circuit protectors that are manually operated or power operated. Addressed are circuit protectors of the stationary type with 2-pole or 3-pole construction, having one or more rated maximum voltages of 508 V and 254 V rms for application on systems having nominal voltages of 480 V and 240 V RMS. The circuit protectors considered are furnished with current-limiting fuses such that the entire device is suitable for application on circuits capable of delivering not more than 200 000 An rms symmetrical short-circuit current. Service conditions and ratings are discussed, and the functional components of the circuit protectors are described. Temperature limitations and classification of insulating materials are covered. Insulation(dielectric) withstand voltage requirements are specified, and an application guide is given. Test procedures are also specified.