{"id":255818,"date":"2024-10-19T16:54:46","date_gmt":"2024-10-19T16:54:46","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-61643-3312020\/"},"modified":"2024-10-25T12:23:05","modified_gmt":"2024-10-25T12:23:05","slug":"bs-en-iec-61643-3312020","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-61643-3312020\/","title":{"rendered":"BS EN IEC 61643-331:2020"},"content":{"rendered":"

IEC 61643-331:2020 is available as IEC 61643-331:2020 RLV<\/span> which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61643-331:2020 is a test specification for metal oxide varistors (MOV), which are used for applications up to 1 000 V AC or 1 500 V DC in power lines, or telecommunication, or signalling circuits. They are designed to protect apparatus or personnel, or both, from high transient voltages. This document applies to MOVs having two electrodes and hybrid surge protection components. This document also does not apply to mountings and their effect on the MOV\u2019s characteristics. Characteristics given apply solely to the MOV mounted only in the ways described for the tests. This third edition cancels and replaces the second edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – a Varistor MCOV rating assurance test; – an energy rating test (2ms); – revised Dielectric strength and insulation resistance tests.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nundefined <\/td>\n<\/tr>\n
5<\/td>\nAnnex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
7<\/td>\nCONTENTS <\/td>\n<\/tr>\n
10<\/td>\nFOREWORD <\/td>\n<\/tr>\n
12<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
13<\/td>\n3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.1.1 Ratings <\/td>\n<\/tr>\n
14<\/td>\n3.1.2 Characteristics <\/td>\n<\/tr>\n
15<\/td>\nFigure 1 \u2013 V-I characteristic of an MOV <\/td>\n<\/tr>\n
16<\/td>\n3.2 Symbols and abbreviated terms used in this document
3.2.1 Symbols
3.2.2 Abbreviated terms
Figures
Figure 2 \u2013 Symbol for MOV
Figure 3 \u2013 Symbol for thermally protected MOV <\/td>\n<\/tr>\n
17<\/td>\n4 Service conditions
4.1 Operating and storage temperature ranges
4.2 Altitude or atmospheric pressure range
4.3 Relative Humidity
5 Mechanical requirements and materials
5.1 Robustness of terminations
5.2 Solderability
5.3 Marking <\/td>\n<\/tr>\n
18<\/td>\n6 General
6.1 Failure rates
6.2 Test standard atmospheric conditions
7 Electrical requirements
7.1 Varistor voltage (VV)
7.2 Maximum AC (DC) continuous voltage (VM(AC) \/ VM(DC))
7.3 Standby current (ID)
7.4 Capacitance (CV)
7.5 Clamping voltage (VC) <\/td>\n<\/tr>\n
19<\/td>\nTables
Table 1 \u2013 Typical Voltage ratings for disc types <\/td>\n<\/tr>\n
20<\/td>\n7.6 Electrostatic discharge (ESD) (for SMD type MOV only)
7.7 Rated impulse energy
7.8 Nominal discharge current (In)
7.9 Endurance
7.10 Limited current temporary overvoltage
Table 2 \u2013 Typical Voltage Ratings for SMD types <\/td>\n<\/tr>\n
21<\/td>\n8 Standard design test criteria
8.1 General
8.2 Ratings
8.2.1 Single-impulse maximum current (ITM)
8.2.2 Next impulse
Figure 4 \u2013 Test circuit for single-impulse maximum current <\/td>\n<\/tr>\n
22<\/td>\n8.2.3 Maximum Continuous voltage (VM)
8.3 Electrical Characteristics
8.3.1 Clamping voltage (VC)
8.3.2 Standby current (ID)
8.3.3 Varistor voltage (VV)
Figure 5 \u2013 Test circuit for measuring standby current <\/td>\n<\/tr>\n
23<\/td>\n8.3.4 Capacitance (CV)
8.3.5 Rated energy
8.4 Varistor Rating Assurance Testing
Figure 6 \u2013 Test circuit for measuring varistor voltage (VV) <\/td>\n<\/tr>\n
24<\/td>\n8.5 ESD test
9 Nominal discharge current and limited current temporary overvoltage
9.1 Thermally protected varistors \u2013 Sequence of tests
9.2 Temperature and humidity cycle conditioning
Figure 7 \u2013 Varistor rating assurance test setup <\/td>\n<\/tr>\n
25<\/td>\n9.3 Nominal discharge current (In) test description
9.3.1 General <\/td>\n<\/tr>\n
26<\/td>\nFigure 8 \u2013 Nominal discharge current test flowchart <\/td>\n<\/tr>\n
27<\/td>\n9.3.2 Pass\/fail criteria
9.4 Limited current temporary overvoltage test description and procedure for thermally protected varistors
9.4.1 General
Figure 9 \u2013 Sequence of the In Test <\/td>\n<\/tr>\n
28<\/td>\n9.4.2 Sample preparation
9.4.3 Test conditions
9.4.4 Pass\/fail criteria <\/td>\n<\/tr>\n
29<\/td>\n9.5 Dielectric testing
9.5.1 Test conditions for thermally protected MOV
Figure 10 \u2013 Temporary overvoltage limited current test procedure flowchart <\/td>\n<\/tr>\n
30<\/td>\n9.5.2 Setup from foil to leads
9.5.3 Pass criteria
9.6 Insulation Resistance
Table 3 \u2013 Test voltages for dielectric strength Between Test voltage <\/td>\n<\/tr>\n
31<\/td>\nAnnexes
Annex A (informative) MOV testing according to the IEC 61643-11:2011 Surge protective devices for the Class I, II and III
A.1 General
A.2 MOV selection
A.3 Cross reference list of abbreviations, descriptions and definitions <\/td>\n<\/tr>\n
32<\/td>\nA.4 Operating duty test
A.4.1 General
Table A.1 \u2013 Abbreviations, descriptions and definitions <\/td>\n<\/tr>\n
33<\/td>\nFigure A.1 \u2013 Flow chart of the operating duty test <\/td>\n<\/tr>\n
34<\/td>\nFigure A.2 \u2013 Test set-up for operating duty test <\/td>\n<\/tr>\n
36<\/td>\nFigure A.3 \u2013 Flow chart of testing to determine the measured limiting voltage <\/td>\n<\/tr>\n
37<\/td>\nA.4.2 Class I and II operating duty tests (8.3.4.3)
Figure A.4 \u2013 Operating duty test timing diagram for test classes I and II <\/td>\n<\/tr>\n
38<\/td>\nA.4.3 Additional duty test for test class I
A.4.4 Class III operating duty tests
Figure A.5 \u2013 Additional duty test timing diagram for test class I <\/td>\n<\/tr>\n
39<\/td>\nA.4.5 Pass criteria for all operating duty tests and for the additional duty test for test class I
A.4.6 Preferred parameters of impulse discharge current Iimp used for Class I additional duty tests
Figure A.6 \u2013 Operating duty test timing diagram for test class III
Table A.2 \u2013 Preferred parameters for class I test <\/td>\n<\/tr>\n
40<\/td>\nA.4.7 Preferred values of impulse discharge current In used for Class I and Class II residual voltage and operating duty tests
A.4.8 Preferred values of combination generator waveshape used for Class III tests
Table A.3 \u2013 Preferred values for class I and class II tests <\/td>\n<\/tr>\n
41<\/td>\nTable A.4 \u2013 Preferred values for class III tests <\/td>\n<\/tr>\n
43<\/td>\nAnnex B (informative) IEC 61051 Varistors for use in electronic equipment <\/td>\n<\/tr>\n
44<\/td>\nAnnex C (normative) Accelerated Endurance screening test
C.1 Accelerated endurance screening test
C.2 Preparation of sample
C.3 Test conditions
C.4 Refer to test circuit diagram as shown in Figure C.1.
Figure C.1 \u2013 Circuit of accelerated ageing test
Table C.1 \u2013 Current in VT measurement <\/td>\n<\/tr>\n
45<\/td>\nC.5 Pass criteria <\/td>\n<\/tr>\n
46<\/td>\nAnnex D (informative) Proposed test method of MTTF \u2013 Mean time to failure (MTTF)
D.1 Sampling plans
D.2 Total test hours
D.3 Samples
Table D.1 \u2013 Sampling plans <\/td>\n<\/tr>\n
47<\/td>\nD.4 Test set-up
D.5 Intermediate measurements
D.6 Failure criteria
D.7 Acceptance criteria
Figure D.1 \u2013 Test Circuit of MTTF <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Components for low-voltage surge protection – Performance requirements and test methods for metal oxide varistors (MOV)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2020<\/td>\n48<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":255823,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[557,2641],"product_tag":[],"class_list":{"0":"post-255818","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-31-040-01","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/255818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/255823"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=255818"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=255818"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=255818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}