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BS EN IEC 61643-331:2018

BS EN IEC 61643-331:2018

$189.07

Components for low-voltage surge protective devices – Performance requirements and test methods for metal oxide varistors (MOV)

Published By Publication Date Number of Pages
BSI 2018 48
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This part of IEC 61643 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 line, or telecommunication, or signalling circuits. They are designed to protect apparatus or personnel, or both, from high transient voltages.

This specification applies to MOVs having two electrodes and hybrid overvoltage protection components. This specification also does not apply to mountings and their effect on the MOVā€™s characteristics. Characteristics given apply solely to the MOV mounted only in the ways described for the tests.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 CONTENTS
11 FOREWORD
13 1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
14 3.1 Ratings
15 3.2 Characteristics
16 3.3 Symbols
Figures
Figure 1 ā€“ V-I characteristic of an MOV
Figure 2 ā€“ Symbol for MOV
17 3.4 Abbreviated terms
4 Service conditions
4.1 Operating and storage temperature ranges
4.2 Altitude or atmospheric pressure range
4.3 Relative Humidity
Figure 3 ā€“ Symbol for thermally protected MOV
18 5 Mechanical requirements and materials
5.1 Robustness of terminations
5.2 Solderability
5.3 Marking
6 General
6.1 Failure rates
6.2 Test standard atmospheric conditions
7 Electrical requirements
7.1 Nominal varistor voltage
19 7.2 Maximum AC (DC) continuous operating voltage
7.3 Standby current IDC
7.4 Capacitance
7.5 Clamping voltage
Tables
Table 1 ā€“ Typical voltage ratings for disc types
20 Table 2 ā€“ Typical voltage ratings for SMD types
21 7.6 Electrostatic discharge (ESD) (for SMD type MOV only)
7.7 Rated impulse energy (WTM)
7.8 Nominal discharge current In
7.9 Endurance
7.10 Limited current temporary overvoltage
8 Standard design test criteria
8.1 General
8.2 Ratings
8.2.1 Single-impulse maximum current (ITM)
22 8.2.2 Next Impulse
8.2.3 Continuous rated voltage (VM)
8.3 Electrical characteristics
8.3.1 Clamping voltage (VC)
Figure 4 ā€“ Test circuit for single-impulse maximum current
23 8.3.2 Standby current (ID)
8.3.3 Nominal varistor voltage (VN)
8.3.4 Capacitance (CV)
Figure 5 ā€“ Test circuit for measuring leakage current
Figure 6 ā€“ Test circuit for measuring nominal varistor voltage (VN)
24 8.4 Endurance
8.5 ESD Test Method
9 Nominal discharge current and limited current temporary overvoltage
9.1 Thermally protected varistors ā€“ Sequence of tests
9.2 Temperature and humidity cycle conditioning
25 9.3 Nominal discharge current I(n) test description
9.3.1 General
26 Figure 7 ā€“ Nominal Discharge Current Flowchart
27 9.3.2 Pass/fail criteria
9.4 Limited current temporary overvoltage test description and procedure for thermally protected varistors
9.4.1 General
9.4.2 Sample preparation
9.4.3 Test conditions
Figure 8 ā€“ Sequence of the In Test
28 9.4.4 Pass/fail criteria
29 Figure 9 ā€“ Temporary Overvoltage Limited Current test procedure Flowchart
30 9.5 Dielectric testing
9.5.1 Test conditions
9.5.2 Setup from foil to leads
9.5.3 Pass criteria
31 Annex A (informative) MOV testing according to IEC 61643-11:2011 ā€“ 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
32 A.4 Operating duty test
A.4.1 General
Table A.1 ā€“ Comparison of IEC 61643-11 and IEC 61643-311
33 Figure A.1 ā€“ Flow chart of the operating duty test
34 A.4.2 Measured limiting voltage
Figure A.2 ā€“ Test set-up for operating duty test
36 Figure A.3 ā€“ Flow chart of testing to determine the measured limiting voltage
37 A.4.3 Class I and II operating duty tests (8.3.4.3)
A.4.4 Additional duty test for test class I
Figure A.4 ā€“ Operating duty test timing diagram for test classes I and II
38 A.4.5 Class III operating duty tests
Figure A.5 ā€“ Additional duty test timing diagram for test class I
Figure A.6 ā€“ Operating duty test timing diagram for test class III
39 A.4.6 Pass criteria for all operating duty tests and for the additional duty test for test class I
A.4.7 Preferred parameters of impulse discharge current Iimp used for Class I additional duty tests
A.4.8 Preferred values of impulse discharge current In used for Class I and Class II residual voltage and operating duty tests
Table A.2 ā€“ Prefered parameters for class I test
40 A.4.9 Preferred values of combination waveshape used for Class III tests
Table A.3 ā€“ Preferred values for class I and class II tests
41 Table A.4 ā€“ Preferred values for class III tests
42 Annex B (informative) IEC 61051 Varistors for use in electronic equipment
43 Annex C (informative) Accelerated endurance screening test
C.1 Accelerated endurance screening test
C.2 Preparation of sample
C.3 Test conditions
Figure C.1 ā€“ Circuit of accelerated ageing test
44 C.4 Pass criteria
45 Annex D (informative) Proposed test method for determination of mean time to failure (MTTF)
D.1 Sampling plans
D.2 Total test hours
D.3 Samples
Table D.1 ā€“ Sampling plans
46 D.4 Intermediate measurements
D.5 Failure criteria
D.6 Acceptance criteria
Figure D.1 ā€“ Test Circuit of MTTF
47 Bibliography

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BS EN IEC 61643-331:2018
$189.07