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GB/T 10963.3-2025: Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations - Part 3: Circuit-breakers for DC operation
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GB/T 10963.3-2025	English	2254	Add to Cart	11 days [Need to translate]	Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations - Part 3: Circuit-breakers for DC operation
GB/T 10963.3-2016	English	519	Add to Cart	5 days [Need to translate]	Circuit-breakers for overcurrent protection for household and similar installation -- Part 3: Circuit-breakers for d.c. operation

GB/T 10963.3-2025: Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations - Part 3: Circuit-breakers for DC operation

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ICS 29.120.50 CCSK31 National Standards of the People's Republic of China Replaces GB/T 10963.3-2016 Electrical accessories for overcurrent protection in household and similar applications Circuit Breakers Part 3.Circuit Breakers for DC (IEC 60898-3.2022, IDT) Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface V Introduction VII 1.Scope 1 2 Normative References 1 3.Terms and Definitions 2 3.1 Electrical Appliances 2 3.2 General Terminology 3 3.3 Structural Components 5 3.4 Operating Conditions 7 3.5 Characteristic Quantities 7 3.6 Definition of Insulation Coordination 11 4 categories 12 4.1 General Requirements 12 4.2 Based on the extreme number, divide into 12 4.3 Classified into 12 according to the direction of current 4.4 Based on the protection against external influences, 13 4.5 Divided into 13 according to installation method 4.6 Classified into 13 according to connection method 4.7 Based on the instantaneous tripping current (see 3.5.18), it is divided into 13 categories. 5 Circuit breaker characteristics 13 5.1 Feature Overview 13 5.2 Rated quantity 14 5.3 Standard Values and Preferred Values 14 6.Markings and other product information 15 7.Standard operating conditions used 16 7.1 General Requirements 16 7.2 Ambient air temperature range 16 7.3 Altitude 17 7.4 Atmospheric conditions 17 7.5 Installation conditions 17 7.6 Pollution Level 17 8.Structural and operational requirements 17 8.1 Mechanical Design 17 8.2 Electric Shock Protection 23 8.3 Dielectric properties and isolation capability 24 8.4°C, temperature rise 24°C 8.5 Continuous work schedule 25 8.6 Automatic Actions 25 8.7 Mechanical and electrical life 26 8.8 Performance under short-circuit current and low DC current 26 8.9 Resistant to mechanical shock and impact 26 8.10 Heat resistance 27 8.11 Resistance to abnormal heating and flame retardancy 27 8.12 Rust prevention 27 8.13 Characteristics when inrush current is applied 27 8.14 Power consumption 27 8.15 Requirements for small DC current 27 9.Experiment 28 9.1 Type testing and test procedures 28 9.2 Test Conditions 28 9.3 Durability test of marking 29 9.4 Reliability testing of screws, current-carrying components and connections 29 9.5 Reliability test of threaded terminals for connecting external copper wires 30 9.6 Electric Shock Protection Test 31 9.7 Dielectric properties and isolation capability test 32 9.8 Temperature rise test and power consumption measurement 35 9.9 28-cycle test 36 9.10 Tripping characteristic test 36 9.11 Mechanical and Electrical Life Tests 38 9.12 Short-circuit test 39 9.13 Mechanical stress 45 9.14 Heat resistance test 47 9.15 Resistance to abnormal heating and flame retardancy 48 9.16 Rust prevention test 49 9.17 Characteristics when inrush current is applied 49 Appendix A (Normative) Determining Electrical Clearances and Creepage Distances 61 Appendix B (Normative) Test Procedures and Specimen Quantities 65 Appendix C (Informative) Coordination of Circuit Breakers and Other Short-Circuit Protective Devices (SCPDs) Connected in the Same Circuit Under Short-Circuit Conditions 69 Appendix D (Informative) Example 75 of Terminal Blocks Appendix E (Informative) ISO and AWG Copper Conductor Comparison 78 Appendix F (Normative) Apparatus for Short-Circuit Testing 79 Appendix G (Normative) Routine Tests 81 Appendix H (Normative) Special requirements for circuit breakers with unthreaded terminals for connecting external copper conductors 82 Appendix I (Normative) Special Requirements for Circuit Breakers with Flat Quick-Connect Terminals 88 Appendix J (Normative) Aluminum terminals with threaded terminals for connecting external untreated aluminum wires and for connecting copper or aluminum wires. Special requirements for threaded terminal block circuit breakers 94 References 103

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 3 of GB/T 10963 "Electrical Accessories - Overcurrent Protection Circuit Breakers for Household and Similar Applications". GB/T 10963 has published the following parts. ---Part 1.Circuit breakers for AC; ---Part 2.Circuit breakers for AC and DC; ---Part 3.Circuit breakers for DC applications. This document replaces GB/T 10963.3-2016 "Overcurrent protection circuit breakers for household and similar applications - Part 3.DC". Compared with GB/T 10963.3-2016, the main technical changes in "Circuit Breakers" are as follows, except for structural adjustments and editorial modifications. ---The rated voltage has been changed to not exceed 440V (see Chapter 1 and 5.3.1); ---The terminology and definition of critical current have been removed (see 3.2.15 in the.2016 edition); ---A new classification has been added for three-pole circuit breakers with two protective poles and one non-polarized protective M pole (see 4.2); ---Added mechanical and electrical life testing for three-pole circuit breakers with two protective poles and one non-polarized protective M pole. Short-circuit verification (see 8.1.2, 9.11, and 9.12); ---Product categories and verification at ambient air temperatures of -25℃ to 40℃ have been removed (see.2016 version). 4.9, 8.6.3.2 (2016 version), and 9.10.4.2 (2016 version). ---The instantaneous tripping characteristic requirements have been changed (see 4.7, 5.3.4, and 9.10.3); ---The time constant category has been removed; time constant requirements are now specified separately in the test requirements (see sections 4.7, 9.10.3.1, and.2016 edition). (9.11.1 and 9.12.5). This document is equivalent to IEC 60898-3.2022 "Electrical accessories for overcurrent protection circuit breakers in household and similar locations - Part 3." Circuit breakers for DC power. The following minimal editorial changes have been made to this document. ---The incorrect citation "9.12.9.1" in the original text has been corrected to "9.12.9.2" (see 9.12.9.3); ---The incorrect citation "9.13.2.1" in the original text has been corrected to "9.13.2.2" (see 9.13.2.1); ---The incorrect reference "9.10.2" in Appendix B, Table B.4, Note a is corrected to "9.10.3" (see Appendix B, Table B.4); ---The incorrect reference "9.5.1" in Appendix J Table J.3 Note b is corrected to "9.5.2" (see Appendix J Table J.3). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee on Standardization of Low Voltage Electrical Appliances (SAC/TC189). This document was drafted by. Shanghai Electrical Apparatus Research Institute, Delixi Electric Co., Ltd., Shanghai Nuoark Electric Co., Ltd., and Shanghai Liangxin. Electrical Appliances Co., Ltd., Zhejiang Tianzheng Electric Co., Ltd., Beijing ABB Low Voltage Electrical Appliances Co., Ltd., Shanghai Siemens Line Protection System Legrand Low Voltage Electrical Appliances (Wuxi) Co., Ltd., Zhejiang Baishibao Electric Appliance Co., Ltd., Zhejiang People's Electric Appliance Co., Ltd. Huatong Electromechanical Co., Ltd., Great Wall Electric Group Zhejiang Technology Co., Ltd., Meigao Electric (Wuhu) Co., Ltd., and China Electric Equipment Shandong Electric Subsidiary Company Limited, Wenzhou Huajia Electric Appliance Co., Ltd., Dehong Power Supply Bureau of Yunnan Power Grid Co., Ltd., Zhejiang Provincial Institute of Mechanical and Electrical Products Quality Inspection Limited Liability Company, Henan Xuji Instrument Co., Ltd., Yunnan Tuozhou Technology Co., Ltd., Kedu Electric Co., Ltd., Zhejiang Chint Electric Co., Ltd. Limited Liability Company. The main drafters of this document are. Wang Yuxuan, Qi Weihua, Lu Kejun, Yang Na, Lu Quansheng, Li Hao, Chen Jia, Fu Kai, Shi Hongwei, Gu Guanpeng, and Wang Zhiyong. Ye Gaopei, Sun Zaisheng, Meng Lingxin, Zhou Yanfei, Shang Jingrui, Fu Bing, Tan Ganjiang, Yang Yongxiang, Li Ziping, Zhang Yinglin. The document replaced by this document has been released in the following versions. ---GB/T 10963.3-2016; ---This is the first revision.

Introduction

GB/T 10963 "Electrical Accessories - Overcurrent Protection Circuit Breakers for Household and Similar Applications" is a guideline for household and similar applications in my country. The important series of standards for overcurrent protection circuit breaker products are proposed to consist of three parts. ---Part 1.Circuit Breakers for AC Systems. The purpose is to specify the performance requirements and testing procedures for circuit breakers used in AC systems. Product requirements such as methods. ---Part 2.Circuit Breakers for AC and DC Systems. The purpose is to specify circuit breakers suitable for use in both AC and DC systems. Product requirements, including performance requirements and testing methods. ---Part 3.Circuit Breakers for DC Systems. The purpose is to specify the performance requirements and testing procedures for circuit breakers used in DC systems. Product requirements such as methods. Electrical accessories for overcurrent protection in household and similar applications Circuit Breakers Part 3.Circuit Breakers for DC

1 Scope

This document applies to applications with a rated DC voltage not exceeding 440V, a rated current not exceeding 125A, and a rated short-circuit capacity not exceeding 10000A. DC circuit breakers. These circuit breakers are used to protect building wiring from overcurrent and for similar purposes; they are designed for use by untrained personnel. It is usable and requires no maintenance. The circuit breakers described in this document are intended for use in pollution level 2 environments. The circuit breaker in this document has an isolation function. The circuit breakers described in this document are suitable for use in TN and TT systems, and may be applicable to IT systems under special circumstances. This document also applies to circuit breakers with several rated currents, provided that the current is changed from one rated value to another during normal operation. The rated instrument is inaccessible and its rated value cannot be changed without tools. This document is not applicable to. ---Circuit breaker to protect the motor; ---A circuit breaker whose setting current can be adjusted by a device accessible to the user. For protection ratings higher than IP20 in IEC 60529, and for applications in harsh environments (e.g., excessive humidity, excessive heat, excessive cold, or dust). Circuit breakers used in locations with sedimentation or in hazardous locations (such as places prone to explosion) may require special structures. For environments with high levels of pollution, an enclosure with an appropriate level of protection should be used. This document does not apply to AC-operated circuit breakers, the requirements of which are given in IEC 60898-1. This document does not apply to circuit breakers that can be operated in both AC and DC modes; the requirements are detailed in IEC 60898-2. The circuit breakers applicable to this document have high resistance to accidental tripping, whether caused by inrush current from electronic loads or circuits. This was caused by the switching operation in the middle. Note. Based on their tripping and installation characteristics, circuit breakers within the scope of this document can also be used for electric shock protection in fault conditions. (For electric shock protection) The scope of application is specified in the installation regulations. This document contains all the requirements necessary to ensure that the type test results meet the operational performance requirements for this type of device. This document also includes relevant details necessary to ensure the reproducibility of the test results. Under short-circuit conditions, the guidelines for coordination between circuit breakers and other short-circuit protection devices (SCPDs) are provided in Appendix C. Routine tests for revealing unacceptable changes in materials or manufacturing that may affect safety are described in Appendix G.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 3956-2008 Conductors of cables (IEC 60228.2004, IDT) GB/T 5169.11-2017 Fire Hazard Testing of Electrical and Electronic Products - Part 11.Basic Test Methods for Glow Wire/Hot Wire Glow wire flammability test method (GWEPT) (IEC 60695-2-11.2014, IDT) GB/T 16935.1-2023 Insulation Coordination of Equipment in Low-Voltage Power Supply Systems - Part 1.Principles, Requirements and Tests ...