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GB 13539.1-2015 English PDF

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GB 13539.1-2015: [GB/T 13539.1-2015] Low-voltage fuses -- Part 1: General requirements
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GB 13539.1: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB 13539.1-2015English1819 Add to Cart 9 days [Need to translate] [GB/T 13539.1-2015] Low-voltage fuses -- Part 1: General requirements Valid GB 13539.1-2015
GB/T 13539.1-2015English1394 Add to Cart 8 days [Need to translate] Low-voltage fuses -- Part 1: General requirements Valid GB/T 13539.1-2015
GB 13539.1-2008EnglishRFQ ASK 6 days [Need to translate] Low-voltage fuses -- Part 1: General requirements Obsolete GB 13539.1-2008
GB 13539.1-2002EnglishRFQ ASK 6 days [Need to translate] Low-voltage fuses -- Part 1: General requirements Obsolete GB 13539.1-2002
GB 13539.1-1992EnglishRFQ ASK 9 days [Need to translate] General requirements for low-voltage fuses Obsolete GB 13539.1-1992

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Basic data

Standard ID GB 13539.1-2015 (GB13539.1-2015)
Description (Translated English) [GB/T 13539.1-2015] Low-voltage fuses -- Part 1: General requirements
Sector / Industry National Standard
Classification of Chinese Standard K30
Classification of International Standard 29.120.50
Word Count Estimation 70,725
Date of Issue 2015-09-11
Date of Implementation 2016-10-01
Older Standard (superseded by this standard) GB 13539.1-2008
Quoted Standard GB/T 321-2005; GB/T 16839.1-1997; IEC 60038-1983; IEC 60050-441-1984; IEC 60050-441-1984/AMD 1-2000; IEC 60269-2; IEC 60269-3; IEC 60269-4; IEC 60269-5; IEC 60364-3-1993; IEC 60364-5-52-2001; IEC 60529-1989; IEC 60617; IEC 60664-1-2002; IEC 60695-2-10-2000; IEC 60695-2-11-2000; IEC 60695-2-12-2000; IEC 60695-2-13-2000; ISO 478-1974; ISO 593-1974; IEO 4046-1978
Adopted Standard IEC 60269-1: 2009, IDT
Regulation (derived from) National Standard Announcement 2015 No.25
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Standard applies equipped rated breaking capacity of not less than 6 kA fuse closed limiting fuses. The fuse as a protective nominal voltage not exceeding 1 000V AC power frequency circuit or the nominal voltage not exceeding 1 500 V dc circuit. Continued part of the standard under this section includes additional requirements in those applications under special conditions of the fuses. IEC 60947-3 "Low-voltage switchgear and control equipment Part 3: Switches, FA off, isolating switches and fuse-combination" fuse used should also comply with the requirements of this section. This section does not apply to miniature fuses, miniature fuses standard IEC 60127.

GB 13539.1-2015: [GB/T 13539.1-2015] Low-voltage fuses -- Part 1: General requirements

---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 fuses Part 1. General requirements ICS 29.120.50 K30 National Standards of People's Republic of China Replacing GB 13539.1-2008 Low-voltage fuses Part 1. General requirements (IEC 60269-1.2009, IDT) Issued on. 2015-09-11 2016-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ 1 General 1 1.1 Scope and purpose 1 1.2 Normative references 1 2 Terms and definitions 2 2.1 Fuse and its components 3 2.2 General terms 4 2.3 characteristic value 6 3 9 normal operating conditions 3.1 The ambient air temperature (Ta) 9 3.2 Altitude 9 3.3 atmospheric conditions 9 3.4 voltage 9 3.5 Current 9 3.6 frequency, power factor and the time constant of 10 3.7 Installation conditions 10 3.8 Use category 10 3.9 Selective fuse 10 Category 4 10 5 Characteristics of fuses 10 5.1 Features Summary 10 5.2 rated voltage 11 5.3 Rated current 11 5.4 rated frequency (see 6.1 and 6.2) 12 5.5 Rated power dissipation of fuse and fuse holder rated acceptable power dissipation 12 5.6 Time - current characteristic limit 12 5.7 Breaking range and breaking capacity 14 5.8 chopping current characteristic I2t and 15 6 flag 15 6.1 fuse holders sign 15 6.2 fuse mark 15 6.3 16 glyph Design standard conditions 7 16 7.1 Mechanical Design 16 7.2 Applicability of insulation and isolation 16 Power dissipation and acceptable power dissipation of 7.3 temperature fuse holders, fuse 17 18 7.4 Action 7.5 Breaking capacity 18 7.6 chopping current characteristic 18 7.7 I2t characteristics 19 7.8 Selective overcurrent fuse 19 19 7.9 Protection against electric shock 7.10 Heat resistance 21 7.11 Mechanical strength 21 7.12 corrosion 21 7.13 resistance to abnormal heat and fire 22 7.14 Electromagnetic compatibility 22 8 Test 22 8.1 General 22 8.2 insulation and isolation suitability verification 27 8.3 verify the temperature rise and power dissipation 29 8.4 Action Verify 31 8.5 breaking capacity verification 34 8.6 verify the current chopping characteristic 39 8.7 I2t characteristics and overcurrent selective authentication 39 8.8 enclosure class verification 39 8.9 heat resistance verification 39 8.10 contacts do not deteriorate verification 40 8.11 Mechanical tests and other tests 40 Appendix A (normative) Measurement of short-circuit power factor 51 Appendix B (Informative Appendix) "gG", "gM", "gD" and "gN" fuse pre-arcing I2t value of the fuse I2t value and lower voltages Calculation 53 Annex C (informative) chopping current - time characteristics of computing 54 Effect of changes in Appendix D (informative) ambient temperature and environment on the performance of the fuse 57 Particular requirements 58 Annex E (normative) having to connect an external copper conductors without screw-type terminal fuse base References 64

Foreword

This section 5.7.2 rated breaking capacity, insulation and isolation applicability 7.2, 7.5 breaking capacity, protection against electric shock 7.9, 8.2 insulation and isolation suitability verification, 8.5 breaking capacity verified as mandatory, others are recommended. GB 13539 "Low-voltage fuses" currently consists of the following six sections. --- Part 1. General requirements; --- Part 2. Supplementary requirements for full-time personnel fuses (fuses mainly for industrial application) standardized systems of fuses Example A through K; --- Part 3. fuses for use by unskilled persons Supplementary requirements (fuses mainly for household and similar purposes) standard Example of fuse system A to F; --- Part 4. Supplementary requirements for protection of semiconductor devices fuse body; --- Part 5. low voltage fuse Application Guide; --- Part 6. solar photovoltaic system protection Supplementary requirements for fuse. This is Part 1 GB 13539; the first section 2,3,4 and 6 GB 13539 in this section referred to under continuous part of the standard. This section drafted in accordance with GB/T 1.1-2009 given rules. This Part replaces GB 13539.1-2008 "Low-voltage fuses - Part 1. General requirements." This part of GB 13539.1-2008 The main difference. --- Table 13, "Other current rating fuse fuse the same test series between the maximum and minimum current rating and fuse subjects Number list "to add a fuse g sample. Original conventional non-fusing current test and the rated current test using the same test Product test, was replaced with a sample of each test; --- 8.2.3 "Isolation suitability verification" in the original language of the first sentence the words "clearances and creepage distances should be measured by the size and voltage test authenticating. "; --- Table 21 "breaking capacity test parameters DC fuse" time constant column, the former "15ms ~ 20ms", was replaced by. "Pre Of current 20kA or more. 15ms ~ 20ms; prospective current 20kA and below. 0.5 (I) 0.3ms, tolerance 20 0% (I to A units) "; --- Increase in Appendix E (normative) "has a special connection to external copper conductors without screw-type terminal to the fuse bases begging". This section uses the translation method is equivalent to using IEC 60269-1.2009 "Low-voltage fuses - Part 1. General requirements." Consistency correspondence between this part of international documents and normative references of our files are as follows. --- GB/T 156-2007 standard voltage (IEC 60038.2002, MOD); --- GB 4208-2008 housing protection (IP Code) (IEC 60529.2001, IDT); --- GB/T 4687-2007 paper, cardboard, pulp and related terms (ISO 4046.2002, MOD); --- GB/T 13539.2-2015 Low-voltage fuses - Part 2. Supplementary requirements for full-time personnel fuse (mainly used Industrial fuses) examples of standardized systems of fuses A to K (IEC 60269-2.2013, IDT); --- GB 13539.3-2008 Low-voltage fuses - Part 3. unskilled personnel Supplementary requirements for fuses (mainly used Household and similar fuses) examples of standardized systems of fuses A to F (IEC 60269-3.2006, IDT); --- GB/T 13539.4-2009 Low-voltage fuses - Part 4. protection of semiconductor devices complement fuse requirements (IEC 60269-4.2006, IDT); --- GB/T 13539.5-2013 Low-voltage fuses - Part 5. Low-voltage fuses application guide (IEC 60269-5.2010, IDT); --- GB 16895.6-2000 Electrical installations of buildings - Part 5. Selection and erection of electrical equipment - Chapter 52. Wiring system EC (idtIEC 60364-5-52.1993); --- Insulation coordination GB/T 16935.1-2008 within the low-pressure system equipment - Part 1. Principles, requirements and tests (IEC 60664-1.2007, IDT). This part made the following editorial changes. --- Delete tables, graphs and editorial comments under 2.1.12; --- References IEC 60127 English as "for small fuse tube fuse," inconsistent with the existing IEC versions, the English changed "IEC 60127 miniature fuses"; --- Taking into account national circumstances, this part of filling out a statement on the exchange 1140V fuse in 1.1. This part is proposed by the China Electrical Equipment Industrial Association. This part of the National Standardization Technical Committee fuse (SAC/TC340) centralized. This section is responsible for drafting unit. Shanghai Electric Apparatus Research Institute, Shanghai Electric Technology Co., Ltd. Electric Division. Participated in the drafting of this section. Shanghai Electrical Ceramics Co., Ltd., Ningbo electrical switches Manufacturing Co., Ltd., Xi'an fuses have Cooper Ltd., Zhejiang Chint Electric Co., Ltd., Zhejiang and Jiangxi melting Electric Co., Ltd. People Electric Group Co., Ltd., Suzhou Electrical Apparatus Research Institute Study hospital Co., Ltd., the United States and Mickelson Electrical Protection Systems (Shanghai) Co., Ltd., Suzhou City, south-Electric Co., Ltd., Wenzhou is three appliances have Ltd., Xi'an whole fuse factory, hollyland (China) Electronic Technology Co., Ltd., Shanghai electrical equipment testing, Shanghai Siemens line Road Protection Systems Ltd.. The main drafters of this section. Wu Qingyun, Ji Yu Hui. The drafters of some of the participants. the Linhai Ou, Yin Chang, Zhang Yi, Li Chuan, Li Zhenfei, Le Quoc An, Hu Delin, Jia Wei, Li Jianguo, Huang Xuxiong, Shuang library Laiwen Hui, Zhou Gang, Yi Ying, Liang Lijuan, Zhang Lili. This part of the standard replaces the previous editions are. --- GB 13539.1-1992, GB 13539.1-2002, GB 13539.1-2008. Low-voltage fuses Part 1. General requirements

1 General

1.1 Scope and purpose GB 13539 of the present section applies equipped with no less than the rated breaking capacity 6kA closed limiting fuses fuse body. The fuse Protection as a nominal voltage not exceeding 1000V AC frequency circuits or nominal voltage not exceeding 1500V DC circuit. 1) 1) rated voltage 1140V AC fuse can be performed with reference to this section. Fuses and other requirements concerning the performance is determined by the manufacturer and user. Continued lower part of the standard in this section includes additional requirements that apply under the special conditions of the fuses. IEC 60947-3 "Low-voltage switchgear and control equipment - Part 3. Switches, disconnectors, switch and fuse combinations" in the Fuse used should meet the requirements of this part. Note 1. For "a" fuse, the DC performance (see 2.2.4) should be negotiated in detail by the user and manufacturer. Note 2. The fuse for some special purpose, such as a high-frequency electric locomotive with a fuse or circuit fuse, subject to amendments and additions to the use of this section, if required To individually set another standard. Note 3. This section does not apply to miniature fuses, miniature fuses standard IEC 60127. The purpose of this section is to define the characteristics of the fuse or the fuse part (fuse base, load melt parts, fuse), if they have mutual Transsexual (including size, etc.), they can fuse by a fuse or parts having the same characteristics to be interchanged. For this purpose, this part of the special It relates to the following aspects. --- Fuse characteristics. ● Ratings; ● insulation; ● temperature under normal use; ● power dissipation and acceptable power dissipation; ● Time/current characteristic; ● breaking capacity; ● chopping current characteristics and I2t characteristics. --- To verify the type test the fuse characteristics. --- Fuses flag. 1.2 Normative references The following documents for the application of this document is essential. For dated references, only the edition used in this article Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 321-2005 priority number and priority number system (ISO 3. 1973, IDT) GB/T 16839.1-1997 Thermocouples - Part 1. indexing table (idtIEC 60584-1.1995) IEC 60038. 1983 IEC standard voltage (IEC standardvoltages) IEC 60050-441. 1984 International Electrotechnical Vocabulary (IEV) Chapter 441. Switchgear, control devices and fuses (InternationalElectrotechnicalVocabulary (IEV) -Chapter441. Switchgear, controlgearandfuses) Amendments 1 (2000) (Amendiment1) (2000) IEC 60269-2 Low-voltage fuses - Part 2. Supplementary requirements for fuses professional use (mainly for industrial fuse Control) sample standardized systems of fuses A to I (Low-voltagefuses-Part 2. Supplementaryrequirementsforfuses forusebyauthorizedpersons (fusesmainlyforindustrialapplication) -Examplesofstandardizedsys- temsoffusesAtoI) IEC 60269-3 Low-voltage fuses - Part 3. unskilled personnel Supplementary requirements for fuses (mainly used for household and class Like the use of fuses) examples of standardized systems of fuses A to F (Low-voltagefuses-Part 3. Supplementaryrequire- mentsforfusesforusebyunskiledpersons (fusesmainlyforhouseholdorsimilarapplication) -Ex- amplesofstandardizedsystemsoffusesAtoF) IEC 60269-4 Low-voltage fuses - Part 4. Supplementary requirements for protection of semiconductor devices fuse body (Low-voltagefuses- Part 4. Supplementaryrequirementsforfuses-linksfortheprotectionofsemiconductordevices) IEC 60269-5 Low-voltage fuses - Part 5. Low-voltage fuses Application Guide (Low-voltagefuses-Part 5. Guidance fortheapplicationoflow-voltagefuses) IEC 60364-3.1993 Electrical installations of buildings - Part 3. Assessment of general characteristics (Electricalinstalationsof buildings-Part 3. Assessmentofgeneralcharacteristics) IEC 60364-5-52.2001 Electrical installations of buildings Part 5-52. Selection and erection of electrical equipment - Wiring systems (E- lectricalinstalationsofbuildings-Part 5-52. Selectionanderectionofelectricalequipment-Wiring system) IEC 60529. 1989 provided by the housing protection (IP Code) [Degreesofprotectionprovidedbyenclosures (CodeIP)] Graphical symbols for diagrams IEC 60617 (Graphicalsymbolsfordiagrams) IEC 60664-1.2002 within low-voltage systems Insulation coordination for equipment - Part 1. Principles, requirements and tests (Insulationcoordi- nationforequipmentwithinlow-voltagesystems-Part 1. Principles, requirementsandtests) IEC 60695-2-10.2000 Fire hazard testing - Part 2-10. Test methods Glowing/hot wire based glow wire device And general test procedures (Firehazardtesting-Part 2-10. Glowing/hot-wirebasedtestmethods-Glow-wire apparatusandcommontestprocedure) IEC 60695-2-11.2000 Fire hazard testing - Part 2-11. Test methods Glowing/hot wire based on the final product Glow-wire flammability test (Firehazardtesting-Part 2-11. Glowing/hot-wirebasedtestmethods-Glow-wire flammabilitytestmethodforend-products) IEC 60695-2-12.2000 Fire hazard testing - Part 2-12. Test methods based on Glowing/hot wire burning materials Wire flammability test (Firehazardtesting-Part 2-12. Glowing/hot-wirebasedtestmethods-Glow-wire flammabilitytestmethodformaterials) IEC 60695-2-13.2000 Fire hazard testing - Part 2-13. Test methods based on Glowing/hot wire burning materials Wire ignitability test (Firehazardtesting-Part 2-13. Glowing/hot-wirebasedtestmethods-Glow-wireig- nitabilitytestmethodformaterials) ISO 478. 1974 standard size paper for the first ISO range ISO -A series without dressing (Paper- UntrimmedstocksizesfortheISO -ASeries-ISO primaryrange) ISO 593. 1974 Paper for ISO -A series of untrimmed standard sizes ISO supplementary range (Paper- UntrimmedstocksizesfortheISO -ASeries-ISO supplementaryrange) ISO 4046. 1978 Paper, board, pulp and related terms - Vocabulary Bilingual Edition (Paper, board, pulpandrelated terms-Vocabulary-Bilingualedition)

2 Terms and definitions

Note. Fuse general definition can also be found IEC 60050-441. The following terms and definitions apply to this document. 2.1 Fuse and its components 2.1.1 Fuse fuse When the current exceeds a predetermined value sufficiently long time, by fusing one or more specially designed proportional melt breaking of this current, whereby Circuit disconnect device access. Fuses of all components to form a complete device components. [IEV441-18-01] 2.1.2 Fuse holder fuse-holder Fuse base and contain a combination of the fusible element. NOTE. If you do not need to make a clear distinction between this term part of the "fuse holders" indicates fuse-base and/or carrier melting pieces. [IEV441-18-14] 2.1.2.1 Fuse base (fuse holder) fuse-base (fuse-mount) Fixing member fuses with contacts terminals. [IEV441-18-02] Note. Where appropriate cover can be used as part of the fuse bases. 2.1.2.2 Upload melting pieces fuse-carrier Fuse movable member, for the carriage with the body of the fuse. [IEV441-18-13] 2.1.3 Fuse fuse-link Fuse components with the melt after the fuses can be replaced. [IEV441-18-09] 2.1.4 Fuse contact fuse-contact Two or guaranteed between fuse and fuse holder corresponding electrical continuity or more conductive member. 2.1.5 Melt fuse-element The time when the conditions of the current exceeds a predetermined value after a predetermined melting fuse components. [IEV441-18-08] Note. The fuse may comprise several parallel melt. 2.1.6 Indicating device (indicator) indicatingdevice (indicator) Indicates whether the fuse fuse components operation. [IEV441-18-17] 2.1.7 Striker striker Mechanical devices fuse body. When the release operation of the fuse energy required to cause the operation of other devices or indicator, or provide Interlock. [IEV441-18-18] 2.1.8 Terminal terminal An external circuit for electrically connecting the conductive portion of the fuse. Note. Terminals can be connected according to the type of circuit to distinguish between (such as the main terminals, grounding terminals, etc.) can also be distinguished according to structure (such as a screw-type connection Wire terminals, plug-in terminals, etc.). 2.1.9 Analog fuse dummyfuse-link Having a predetermined size and power dissipation of the fuse of the test. 2.1.10 Test base testrig Predetermined test the fuse base. 2.1.11 Standard gauge-piece stopper In order to achieve some degree of non-interchangeable accessory fuse base. 2.1.12 Hinge carrier melting pieces linkedfuse-carrier Mechanically with the carrier melt fuse base hinge member, giving a certain fuse insertion and removal operation. 2.2 General terms 2.2.1 Enclosed fuse enclosedfuse-link The melt is completely closed when the fuse in the nominal range, will not produce any harmful external effects (eg due to arcing and gas release Or flames or metal particles) fuse. [IEV441-18-12] 2.2.2 Limiting fuse current-limitingfuse-link Within a predetermined current range, the fuse fuse, so that the current is limited to be significantly lower than the expected peak current of fuse. [IEV441-18-10] 2.2.3 "G" fuse-links (full-range breaking capacity fuse links, formerly known as general purpose fuse) "g" fuse-link (ful-rangebreaking- capacityfuse-link, formerlygeneralpurposefuse-link) Under specified conditions, to the breaking of the melt to the melting current Rated breaking capacity limit of all current flow between the fuse. 2.2.4 "A" fuse (Part range breaking capacity fuse links, formerly known as back-up fuse) "a" fuse-link (partial-rangebreaking- capacityfuse-link, formerlyback-upfuse-link) Under specified conditions, to breaking are shown in fuse fusing time - minimum current (Figure 2 k2In) to the rated current characteristic curve breaking Limit the ability of all current flow between the fuse. NOTE. "a" fuse usually for short circuit protection. When needed less than k2In overcurrent protection, "a" fuse must be separable from other such small overcurrent Suitable for use with electrical switch streams. 2.2.5 Temperature 2.2.5.1 Ambient air temperature ambientairtemperature Ta The temperature is from the fuse or fuse housing (if any) about 1m at the ambient air temperature. 2.2.5.2 Fluid Ambient temperature fluidenvironmenttemperature Te The temperature is cooled fuse components (contacts, terminals, etc.) of the fluid temperature. If the fuse member mounted in the housing, then Te Zhou Ambient air temperature Ta and the temperature of the fluid inside the fuse parts (contacts, terminals, etc.) of the contact (with respect to the ambient air temperature) ΔTe Sum. If the fuse component is not installed in the housing, it is considered equal to Te Ta. 2.2.5.3 Fuse components temperature fuse-componenttemperature Fuse components (contacts, terminals, etc.) temperature T is temperature related components. 2.2.6 Overcurrent selectivity overcurrentdiscrimination Two or more related properties over current protection devices between the mating. When within a given range of overcurrent, specified in this It means the operation of a range of motion, while the other does not operate. 2.2.7 Fuse Systems fuse-system It follows the same design principles in the physical shape of the fuse, contact type etc. fuse family. 2.2.8 Size size Fuse system defined set of fuse sizes, each size comprising a given rated current range that the fuse size constant. 2.2.9 The same fuse series homogeneousseriesoffuse-links Given the size of the fuse within the category, only slightly different characteristics for a given test, as long as the test one or a few Specific fuse fuse can be representative of the same series. Note. the same series of fuse characteristics may differ and should be verified. Differences verified details of these characteristics specified in the relevant test (see Table 12 and Table 13). [IEV441-18-34, as amended] 2.2.10 (The fuse) Utilization category utilizationcategory (ofafuse-link) Comprehensive requirements. These requirements and fuse protection to achieve its purpose related conditions, and represent the practical application of a set of special Sex (see 5.7.1). 2.2.11 Fuses used full-time staff (formerly known as industrial fuses) fusesforusebyauthorizedpersons (formerly caledfusesforindustrialapplication) The only full-time staff can approach only by a full-time staff and replace fuses. Note 1. The structure does not have to take measures to ensure the non-interchangeability and to prevent accidental contact with live parts. Note 2. The full-time staff should be IEC 60364-3 significance in BA4 3) under the category "guided by the staff" 2) and BA5 "skilled" to understand. 2) under the direction of personnel. in or under the guidance of skilled care personnel to avoid electric shock (such as operation and maintenance personnel). 3) Skilled workers. with technical knowledge or sufficient operating experience, to avoid risk of electric shock staff (engineers and technicians). 2.2.12 Fuse use by unskilled persons (formerly known as household or similar use fuses) fuseforusebyunskiledpersons (for- merlycaledfusesfordomesticandsimilar) Unskilled personnel can approach and can be replaced by a non-skilled fuse. Note. For this type of fuse, should be protected from direct contact with live parts, if necessary, may request non-interchangeable. 2.2.13 Non-interchangeability of non-interchangeability Restrictions on the shape and (or) size, so as not to inadvertently use electrical performance in a particular fuse base different from the predetermined protection Class fuse. [IEV441-18-33] 2.3 characteristic value 2.3.1. Rating rating Generic term for the value of design features, and it defines the working conditions, the working conditions and equipment design as a test basis. [IEV441-18-36] Note. Low-voltage fuses usually provide rating. voltage, current, breaking capacity, power dissipation and acceptable power dissipation, frequency (if applicable). In the exchange of information The rated voltage and rated current rms symmetrical; in the DC case, when the ripple exists, the average rated voltage, rated current rms. If not otherwise specified, the above-mentioned provision applies to any voltage and current values. 2.3.2 (With fuses and circuit-related) prospective current prospectivecurrent (ofacircuitandwithrespecttoafuse) Assumed fuse circuit in each pole by a negligible impedance wire replaced when the current flowing through the circuit. For exchanges, the prospective current effective value of an AC component. Note. The current is expected to fuse breaking capacity and characteristics [such as I2t and cut-off current characteristics (see 8.5.7)] of the reference amount. [IEV441-17-01, as amended] 2.3.3 Threshold gate The fuses limit; within this limit range, a fuse characteristics, such as time - current characteristic. 2.3.4 Breaking capacity fuse breakingcapacityofafuse In the use and performance of specified conditions, the fuse at a predetermined current value can be expected under the breaking voltage. [IEV441-17-08, as amended] 2.3.5 Breaking range breakingrange Breaking capacity fuse is guaranteed current value of the expected range. 2.3.6 Cut off the current cut-offcurrent The maximum instantaneous value of the current during the breaking fuse achieved, thereby preventing current reaches the maximum value. 2.3.7 Chopping current characteristic cut-offcurrentcharacteristic Let-through current characteristic let-throughcurrentcharacteristic In the fuse specified conditions, as a function of the prospective current cut-off current curve. Note. In the case of ac, the maximum cut-off current is asymmetric any degree attainable; At DC, the current is cut off at a predetermined time constant Under the maximum number reached. [IEV441-17-14] 2.3.8 Peak withstand current peakwithstandcurrent (fuse support member) (ofafuse-holder) Chopping current fuse holders can bear. Note. The peak withstand current is not less than the maximum cut-off current and fuse holders equipped with any of the fuse body. 2.3.9 Arcing time pre-arcing...

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