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GB/T 14048.2-2020: Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
Status: Valid GB/T 14048.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 14048.2-2020 | English | 3879 |
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Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
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GB/T 14048.2-2020
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| GB 14048.2-2008 | English | 620 |
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[GB/T 14048.2-2008] Low-voltage switchgear and controlgear -- Part 2: Circuit-breakers
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| GB 14048.2-2001 | English | RFQ |
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Low-voltage switchgear and controlgear Low-voltage circuit breakers
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Low-voltage switchgear and controlgear Low-voltage circuit breakers
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PDF similar to GB/T 14048.2-2020
Basic data | Standard ID | GB/T 14048.2-2020 (GB/T14048.2-2020) | | Description (Translated English) | Low-voltage switchgear and controlgear - Part 2: Circuit-breakers | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K31 | | Classification of International Standard | 29.120.40 | | Word Count Estimation | 226,283 | | Date of Issue | 2020-09-29 | | Date of Implementation | 2021-04-01 | | Older Standard (superseded by this standard) | GB/T 14048.2-2008 | | Regulation (derived from) | National Standard Announcement No. 20 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 14048.2-2020: Low-voltage switchgear and controlgear - Part 2: Circuit-breakers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Low-voltage switchgear and controlgear - Part 2.Circuit-breakers
ICS 29.120.40
K31
National Standards of People's Republic of China
Replace GB/T 14048.2-2008
Low-voltage switchgear and control equipment
Part 2.Circuit Breaker
2020-09-29 released
Implementation on 2021-04-01
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
1 General 1
1.1 Scope and purpose 1
1.2 Normative references 2
2 Terms and definitions 2
3 Category 6
3.1 Divided by selective category 6
3.2 According to the breaking medium 6
3.3 According to design type 6
3.4 According to the control method of the operating mechanism 6
3.5 According to whether it is suitable for isolation 6
3.6 Points 6 according to whether maintenance is required
3.7 According to the installation method 7
3.8 According to the enclosure protection level 7
4 Characteristics of circuit breakers 7
4.1 Feature Overview 7
4.2 Type of circuit breaker 7
4.3 Ratings and limits of the main circuit 7
4.4 Selective category 10
4.5 Control circuit 10
4.6 Auxiliary circuit 11
4.7 Release 11
4.8 Built-in fuse (circuit breaker with fuse) 12
5 Product data and information 12
5.1 Types of data 12
5.2 Logo 13
5.3 Installation, operation and maintenance manual 14
6 Normal working, installation and transportation conditions 14
7 Structure and performance requirements 15
7.1 Structural requirements 15
7.2 Performance requirements 16
7.3 Electromagnetic compatibility (EMC) 22
8 Experiment 22
8.1 Test types 22
8.2 Verification structure requirements 22
8.3 Type test 23
8.4 Routine test 50
8.5 Special tests-damp heat, salt spray, vibration and shock 53
Appendix A (Normative Appendix) The coordination of a circuit breaker and another short-circuit protection device connected in series in the same circuit under short-circuit conditions 55
Appendix B (Normative Appendix) Circuit breakers with residual current protection 64
Appendix C (Normative Appendix) Single-pole short-circuit test procedure 100
Appendix D (Normative Appendix) Additional requirements for circuit breakers intended for aluminum conductor connections 101
Appendix E (informative appendix) Submit items for negotiation between the manufacturer and the user 111
Appendix F (Normative Appendix) Additional tests for circuit breakers with electronic overcurrent protection 112
Appendix G (Normative Appendix) Power consumption 131
Appendix H (Normative Appendix) Test Procedures for Circuit Breakers Used in IT Systems 133
Appendix I Blank 135
Appendix J (Normative Appendix) Electromagnetic Compatibility (EMC) --- Requirements and Test Methods for Circuit Breakers 136
Appendix K (informative appendix) Summary table of characteristic quantity symbols and graphic representations 145
Appendix L (Normative Appendix) Circuit breakers without overcurrent protection requirements 152
Appendix M (Normative Appendix) Residual current device module (without internal current breaking device) 156
Appendix N (Normative Appendix) Electromagnetic Compatibility---not included in Appendix B, Appendix F and Appendix M. Additional requirements and tests for accessories
Appendix O (Normative Appendix) Instantaneous Trip Circuit Breaker (ICB).199
Appendix P (Normative Appendix) DC Circuit Breaker for Photovoltaic 202
Appendix Q Blank 207
Appendix R (Normative Appendix) Residual current protective circuit breaker with automatic reclosing function 208
References 217
Foreword
GB/T 14048 "Low-Voltage Switchgear and Control Equipment" consists of the following parts.
---Part 1.General Provisions;
---Part 2.Circuit breaker;
---Part 3.Switch, isolator, isolating switch and fuse combination electrical appliances;
---Part 4-1.Contactors and motor starters Electromechanical contactors and motor starters (including motor protectors);
---Part 4-2.Contactors and motor starters, semiconductor controllers and starters for AC motors (including soft starters);
---Part 4-3.AC semiconductor controllers and contactors for non-motor loads of contactors and motor starters;
---Part 5-1.Control circuit appliances and switching elements electromechanical control circuit appliances;
---Part 5-2.Proximity switches for control circuit appliances and switching elements;
---Part 5-3.Requirements for proximity switches (PDDB) with deterministic functions for control circuit appliances and switching elements under fault conditions;
---Part 5-4.Special tests for performance evaluation methods of small-capacity contacts of control circuit appliances and switching elements;
---Part 5-5.Electrical emergency braking device with mechanical latch function for control circuit appliances and switching elements;
---Part 5-6.Control circuit appliances and switching elements, proximity sensors and switching amplifiers DC interface (NAMUR);
---Part 5-7.Requirements for control circuit appliances and switching components for proximity equipment with analog output;
---Part 5-8.Three-position enable switch for control circuit appliances and switching elements;
---Part 5-9.Control circuit appliances and switching elements flow switches;
---Part 6-1.Multifunctional electrical switch appliances;
---Part 6-2.Multi-function electrical equipment (equipment) control and protection switching electrical equipment (equipment) (CPS);
---Part 7-1.Auxiliary device copper conductor terminal block;
---Part 7-2.Protective conductor terminal block for auxiliary device copper conductor;
---Part 7-3.Safety requirements for auxiliary device fuse terminal blocks;
---Part 7-4.PCB terminal block of auxiliary device copper conductor;
---Part 8.Built-in thermal protection (PTC) control unit for rotating electrical machines.
This part is Part 2 of GB/T 14048.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 14048.2-2008 "Low-Voltage Switchgear and Control Equipment Part 2.Circuit Breakers", and is in line with GB/T 14048.2-2008
Compared with.2008, in addition to editorial changes, the main technical changes are as follows.
---Expanded the upper limit of the AC voltage in the range, that is, no more than 1500V (see Chapter 1);
--- Added the terms "2.21 Overcurrent Setting Ir", "2.22 Programmable Logic Controller" (PLC) and "2.23 Closed Tripper" (see 2.21, 2.22, 2.23);
--- Supplementary related to impulse withstand voltage, electrical clearance, dielectric test, etc. whose rated value exceeds AC 1000V but does not exceed 1500V
Provisions (see 7.1.4, 7.2.3.2, 8.4.6);
---In the glow wire test of the material, the test temperature of the insulating material used to fix the current-carrying parts is specified, the main circuit is 960°C, and the other circuits are 850°C (see 7.1.1);
---Add "7.1.8 for digital input and output requirements with programmable logic controller (PLC)" (see 7.1.8);
--- Modify the temperature rise regulations of "7.2.2.3 Main Circuit", and the current that should be able to withstand is changed from the agreed heating current to the rated current In (see 7.2.2.3);
---In "8.3.1 Test Procedure", add optional test procedures for AC circuit breakers with different numbers of poles, and add Tables 9b and 9c (see 8.3.1);
---Add "8.3.9 Critical DC Load Current Test", which mainly specifies test requirements for DC circuit breakers (see 8.3.9);
---Add "8.5 Special Tests-Humidity and Heat, Salt Spray, Vibration and Shock" (see 8.5);
--- In Appendix A, the content of "A.5 Verification of Selectivity" is refined, and theoretical research on selectivity is added and selectivity is determined through experiments
The regulations and requirements of the two methods (see A.5);
---In Appendix B and Appendix M, the requirements and test methods for Type B CBR and Type B MRCD are added (see B.4.4.3, B.7.2.10,
B.8.8, M.8.8.3);
---Update relevant EMC performance and requirements in Appendix B, F, J (see B.8.13.1.1, F.3.2, J.2);
--- Added "Appendix D (Normative) Special requirements for circuit breakers expected to be used for aluminum wire connection";
--- Added "Appendix P (Normative) DC Circuit Breakers for Photovoltaics";
--- Added "Appendix R (normative) Residual current protection circuit breaker with automatic reclosing function".
This section uses the redrafting law to modify and adopt IEC 60947-2.2019 "Low-voltage switchgear and control equipment Part 2.Circuit breaker".
The technical differences between this part and IEC 60947-2.2019 and the reasons are as follows.
---Regarding normative reference documents, this section has made adjustments with technical differences to adapt to my country's technical conditions and adjustments.
The situation is collectively reflected in 1.2 "Normative Reference Documents", and the specific adjustments are as follows.
● Replace IEC 60068-2-30 with GB/T 2423.4 which is equivalent to adopting international standards;
● Replace IEC 60068-2-14 with GB/T 2423.22 which is equivalent to adopting international standards;
● Replace IEC 60228 with GB/T 3956 which is equivalent to adopting international standards;
● Replace IEC 60269-1 with GB/T 13539.1 which is equivalent to adopting international standards;
● Replace IEC 60947-1.2007 and IEC 60947-1.2007/amendment 1.2010 with GB/T 14048.1-2012 which is modified to adopt international standards;
● Replace IEC 60947-4-1 with GB/T 14048.4 which is equivalent to adopting international standards;
● Replace IEC 62475.2010 with GB/T 16927.4-2014 which is modified to adopt international standards;
● Replace IEC 61140.2016 with GB/T 17045-2008 which is equivalent to adopting international standards;
● Replace IEC 61000-4-11 with GB/T 17626.11 which is equivalent to adopting international standards;
● Replace IEC 61545 with GB/T 32499 which is modified to adopt international standards;
● Replace CISPR11 with GB 4824 which is equivalent to adopting international standards.
---Considering the actual use in our country, the "open type" in Chapter 3 "Classification" is not reasonable enough, and the usual noun "universal type" is still used.
The material shell type is also called "molded shell type" or "plastic shell type".
This section has made the following editorial changes.
---In accordance with the requirements of GB/T 1.1-2009, the preparation of Chapter 1 is standardized;
---IEC 60947-1.2007/Amendment 2.2014 The content is directly incorporated into the clauses of this part, in the outer margin of the revised clause
The blank position is marked with a vertical double line (‖).
This part was proposed by China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Low Voltage Apparatus Standardization Technical Committee (SAC/TC189).
Drafting organizations of this section. Shanghai Electrical Apparatus Research Institute, Changshu Switch Manufacturing Co., Ltd. (formerly Changshu Switch Factory), Zhejiang Chint Electric Appliance Co., Ltd.
Co., Ltd., Shanghai Liangxin Electric Co., Ltd., Jiangsu Daquan Kaifan Switch Co., Ltd., Hangzhou Zhijiang Switch Co., Ltd.,
Group Zhejiang Gaoke Co., Ltd., Fatai Electric (Jiangsu) Co., Ltd., Shanghai Dianke Electric Technology Co., Ltd., Hangzhou Qianlong
Electric Co., Ltd., Shengdao (China) Electric Co., Ltd., Shanghai Electric Co., Ltd. People's Electric Factory, Schneider Electric (China) Co., Ltd.
The company’s Shanghai branch, Beijing ABB Low Voltage Electric Co., Ltd., Sanxin International Electric Shanghai Co., Ltd., Zhejiang Tianzheng Electric Co., Ltd.
Company, Changan Group Co., Ltd., Jiangsu Huineng Electric Co., Ltd., Legrand Low Voltage Electrical (Wuxi) Co., Ltd., Huatong Electromechanical Co., Ltd.
Company, Hangzhou Kefeng Electronics Co., Ltd., Eaton Electric Co., Ltd., Zhejiang People Electric Co., Ltd., Suzhou Siemens Electric Co., Ltd.
Division, Shanghai Electrical Equipment Testing Institute Co., Ltd., China Inspection Institute of Quality and Technology Inspection and Testing Co., Ltd., Delixi Electric Co., Ltd., Shenyang
Swan Electric Co., Ltd., Jubang Group Co., Ltd., Wenzhou Ruirui Electric Co., Ltd., Tianjin Tianchuan Electric Control Equipment Testing Co., Ltd., Jiaxi
Asia Electronic Appliance Co., Ltd., Meigao Electric Technology Co., Ltd., Shanghai Jingyi Electric Appliance Factory Co., Ltd.
The main drafters of this section. Gu Huimin, Huang Jingye, Guan Ruiliang, Ma Shigang, Huang Yinfang, Ge Fei, Dai Shuidong, Pan Ruxin, Zhong Biao, Chen Zhengxin,
Zhong Fangqiang, Chen Zhenglong, Ni Xiaoyan, Sun Haitao, Zhang Yanhui, Su Hanlin, Yang Hongyi, Wang Xuchuan, Zhang Haiyan, Fu Kai, Wang Zhiyong, Liu Zuming,
Wang Xingyang, Bao Zhizhou, Zhu Lin, Cui Tao, Lou Yingchao, Wu Jianbin, Bai Tao, Zhang Kaicheng, Wu Qijun, Zhang Chunxiang, Zhang Xinyu, Chen Suiduo, Gu Dekang,
Chen Xueqin.
The previous versions of the standards replaced by this part are as follows.
---GB 14048.2-1994, GB 14048.2-2001, GB/T 14048.2-2008.
Low-voltage switchgear and control equipment
Part 2.Circuit Breaker
1 General
1.1 Scope and purpose
This part of GB/T 14048 specifies the terms and definitions, classification, characteristics, product data and information, normal operation, installation
And transportation conditions, structure and performance requirements and tests.
This section applies to circuit breakers whose main contacts are used to connect to circuits with a rated voltage not exceeding 1000V AC or 1500V DC.
Installation and operation by professionally trained and skilled personnel. This section also specifies supplementary requirements for circuit breakers with fuses.
Circuit breakers with a rated voltage higher than AC 1000V but not exceeding 1500V may be tested in accordance with this section.
This section applies to circuit breakers with any rated current, various structural types or various intended purposes.
The requirements for circuit breakers used as ground protection are included in Appendix B.
Additional requirements for electronic overcurrent protection circuit breakers are included in Appendix F.
Additional requirements for IT system circuit breakers are included in Appendix H.
The requirements and test methods for electromagnetic compatibility of circuit breakers are included in Appendix J.
The requirements for circuit breakers without overcurrent protection are included in Appendix L.
The requirements for the residual current device module (without internal current breaking device) are included in Appendix M.
The electromagnetic compatibility requirements and test methods of circuit breaker accessories are included in Appendix N.
The requirements for instantaneous trip circuit breakers (ICB) are included in Appendix O.
The requirements and test methods of DC circuit breakers for photovoltaic (PV) systems are included in Appendix P.
The requirements and test methods of residual current protective circuit breakers with automatic reclosing function are included in Appendix R.
The supplementary requirements for circuit breakers used as direct starters are specified in GB/T 14048.4 applicable to low-voltage contactors and starters.
The requirements for circuit breakers designed to protect conductors in buildings and similar places and designed for use by unskilled personnel are in
It is specified in GB/T 10963.
The requirements for circuit breakers for equipment (such as electrical appliances) are specified in GB/T 17701.
For some specific purposes (such as traction, rolling mill, marine, variable frequency drive downstream circuit and use in explosive environments), it can be used as a circuit breaker.
Some necessary special regulations and supplementary requirements.
Note. The circuit breakers involved in this section may be equipped with devices that can be automatically disconnected under predetermined conditions, such as reverse power or reverse current interruption, except for overcurrent and undervoltage.
Turn on the device. This section does not involve verification of actions under such predetermined conditions.
The purpose of this section is to specify.
a) The characteristics of the circuit breaker.
b) The conditions that the circuit breaker should meet in the following situations.
1) Action and performance during normal work;
2) Action and performance under overload conditions and short-circuit conditions including cooperative use in operation (such as selective and backup protection
The action and performance of the protective coordination);
3) Dielectric properties.
c) All tests and test methods used to prove that the above conditions are met.
d) Data marked or given on the circuit breaker.
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