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eLibrary > BS EN IEC 61643-331:2018 Components for low-voltage surge protective devices - Performance requirements and test methods for metal oxide varistors (MOV) >

BS EN IEC 61643-331:2018 Components for low-voltage surge protective devices - Performance requirements and test methods for metal oxide varistors (MOV), 2018

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BS EN IEC 61643-331:2018 Components for low-voltage surge protective devices - Performance requirements and test methods for metal oxide varistors (MOV), 2018

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CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms [Go to Page]
3.1 Ratings
3.2 Characteristics
3.3 Symbols
Figures [Go to Page]
Figure 1 – V-I characteristic of an MOV
Figure 2 – Symbol for MOV
3.4 Abbreviated terms
4 Service conditions [Go to Page]
4.1 Operating and storage temperature ranges
4.2 Altitude or atmospheric pressure range
4.3 Relative Humidity
Figure 3 – Symbol for thermally protected MOV
5 Mechanical requirements and materials [Go to Page]
5.1 Robustness of terminations
5.2 Solderability
5.3 Marking
6 General [Go to Page]
6.1 Failure rates
6.2 Test standard atmospheric conditions
7 Electrical requirements [Go to Page]
7.1 Nominal varistor voltage
7.2 Maximum AC (DC) continuous operating voltage
7.3 Standby current IDC
7.4 Capacitance
7.5 Clamping voltage
Tables [Go to Page]
Table 1 – Typical voltage ratings for disc types
Table 2 – Typical voltage ratings for SMD types
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 [Go to Page]
8.1 General
8.2 Ratings [Go to Page]
8.2.1 Single-impulse maximum current (ITM)
8.2.2 Next Impulse
8.2.3 Continuous rated voltage (VM)
8.3 Electrical characteristics [Go to Page]
8.3.1 Clamping voltage (VC)
Figure 4 – Test circuit for single-impulse maximum current [Go to Page]
8.3.2 Standby current (ID)
8.3.3 Nominal varistor voltage (VN)
8.3.4 Capacitance (CV)
Figure 5 – Test circuit for measuring leakage current
Figure 6 – Test circuit for measuring nominal varistor voltage (VN)
8.4 Endurance
8.5 ESD Test Method
9 Nominal discharge current and limited current temporary overvoltage [Go to Page]
9.1 Thermally protected varistors – Sequence of tests
9.2 Temperature and humidity cycle conditioning
9.3 Nominal discharge current I(n) test description [Go to Page]
9.3.1 General
Figure 7 – Nominal Discharge Current Flowchart [Go to Page]
9.3.2 Pass/fail criteria
9.4 Limited current temporary overvoltage test description and procedure for thermally protected varistors [Go to Page]
9.4.1 General
9.4.2 Sample preparation
9.4.3 Test conditions
Figure 8 – Sequence of the In Test [Go to Page]
9.4.4 Pass/fail criteria
Figure 9 – Temporary Overvoltage Limited Current test procedure Flowchart
9.5 Dielectric testing [Go to Page]
9.5.1 Test conditions
9.5.2 Setup from foil to leads
9.5.3 Pass criteria
Annex A (informative) MOV testing according to IEC 61643-11:2011 – Surge protective devices for the Class I, II and III [Go to Page]
A.1 General
A.2 MOV selection
A.3 Cross reference list of abbreviations, descriptions and definitions
A.4 Operating duty test [Go to Page]
A.4.1 General
Table A.1 – Comparison of IEC 61643-11 and IEC 61643-311
Figure A.1 – Flow chart of the operating duty test [Go to Page]
A.4.2 Measured limiting voltage
Figure A.2 – Test set-up for operating duty test
Figure A.3 – Flow chart of testing to determine the measured limiting voltage [Go to Page]
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 – Operating duty test timing diagram for test classes I and II [Go to Page]
A.4.5 Class III operating duty tests
Figure A.5 – Additional duty test timing diagram for test class I
Figure A.6 – Operating duty test timing diagram for test class III [Go to Page]
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 – Prefered parameters for class I test [Go to Page]
A.4.9 Preferred values of combination waveshape used for Class III tests
Table A.3 – Preferred values for class I and class II tests
Table A.4 – Preferred values for class III tests
Annex B (informative) IEC 61051 Varistors for use in electronic equipment
Annex C (informative) Accelerated endurance screening test [Go to Page]
C.1 Accelerated endurance screening test
C.2 Preparation of sample
C.3 Test conditions
Figure C.1 – Circuit of accelerated ageing test
C.4 Pass criteria
Annex D (informative) Proposed test method for determination of mean time to failure (MTTF) [Go to Page]
D.1 Sampling plans
D.2 Total test hours
D.3 Samples
Table D.1 – Sampling plans
D.4 Intermediate measurements
D.5 Failure criteria
D.6 Acceptance criteria
Figure D.1 – Test Circuit of MTTF
Bibliography [Go to Page]

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BS EN IEC 61643-331:2018 Components for low-voltage surge protective devices - Performance requirements and test methods for metal oxide varistors (MOV), 2018

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