IEC 60077-3:20 19作为IEC 60077-3:20 19 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60077-3:20 19给出了断路器的规则，断路器的主触点连接到DC电源和/或辅助电路。根据IEC 60850，这些电路的标称电压不超过3 000 V DC。IEC 60077的这一部分与IEC 60077-2一起具体规定: a)断路器的特性； b)断路器符合的使用条件参考: -正常服务中的操作和行为； -短路情况下的操作和行为 -介电性质； c)确认部件在使用条件下符合特性的试验，以及这些试验应采用的方法；d)将在断路器上标记或与断路器一起提供的信息。 第二版取消并取代了2001年发行的第一版。与上一版相比，此版本包括以下主要技术变更: -温升验证程序变更； -气密性试验作为型式试验，增加了绝缘电阻测量。

IEC 60077-3:2019 is available as IEC 60077-3:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60077-3:2019 gives the rules for circuit-breakers, the main contacts of which are connected to DC power and/or auxiliary circuits. The nominal voltage of these circuits does not exceed 3 000 V DC according to IEC 60850. This part of IEC 60077, together with IEC 60077-2, states specifically:
a) the characteristics of the circuit-breakers;
b) the service conditions with which circuit-breakers complies with reference to:
- operation and behaviour in normal service;
- operation and behaviour in the case of short circuit
- dielectric properties;
c) the tests for confirming the compliance of the components with the characteristics under the service conditions and the methods to be adopted for these tests;
d) the information to be marked on, or given with, the circuit breaker.
This second edition cancels and replaces the first edition, issued in 2001. This edition includes the following main technical changes with regard to the previous edition:
- procedure of verification of temperature rise is changed;
- air-tightness test as type test, insulation resistance measurement are added.