本标准涉及以下直接作用电流和电压保护功能的要求:a）直接作用过电流机电跳闸装置b）直接作用过电流电子跳闸系统c）直流断路器的反向电流跳闸系统d）与IEEE Std C37涵盖的低压交流和直流电源断路器集成的欠压跳闸装置。13和IEEE标准C37。14.本标准描述了首选保护功能的可用设置和延时特性要求及其操作和校准要求。IEEE Std C37最新版本中规定了整体断路器的功能要求，包括测试要求（设计、生产或一致性时）。13，IEEE标准C37。 14和ANSI C37。50.本标准不限制在跳闸系统或装置中包含额外的内部或外部功能。

This standard pertains to the requirements for direct-acting current and voltage protective functions of the following that are integral with low-voltage ac and dc power circuit breakers covered by IEEE Std C37.13 and IEEE Std C37.14: a) Direct-acting overcurrent electromechanical trip devices b) Direct-acting overcurrent electronic trip systems c) Reverse-current trip systems for dc circuit breakers d) Undervoltage trip devices This standard describes the requirements for available settings and time delay characteristics for preferred protective functions as well as their operational and calibration requirements. The functional requirements for the overall circuit breaker, including test requirements (whether design, production, or conformance) are specified in the latest versions of IEEE Std C37.13, IEEE Std C37.14, and ANSI C37.50. This standard does not restrict the inclusion of additional internal or external functionality in the trip system or device.