IEC 61051-2:2021 is a sectional specification and is applicable to metal oxide varistors with symmetrical voltage-current characteristics for use in electronic equipment connected to any AC or DC supply system.
These varistors are designed to protect electronic and other sensitive equipment from high transient surges. Varistors under the scope of this sectional specification are not intended to give primary protection against lightning surges.
These varistors have metallic connections and are intended to be mounted as through hole component or directly on to printed boards.
The object of this document is to prescribe preferred ratings and characteristics and to select from IEC 61051-1 the appropriate quality assessment procedures, tests and measuring methods, and to give general performance requirements for this type of varistors.
This edition includes the following significant technical changes with respect to the previous edition:  
revision for the structure in accordance with ISO/IEC Directives, Part 2) to the extent practicable, and for harmonizing with IEC 61051-1:2018;
Annex X has been added for comparison with the previous edition;
two lists of preferred voltage ratings for disk type and SMD type varistors have been added;
permissible numbers of non-conforming items have been set to zero (zero fault) in the test schedule in 8.4.3.

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A Blank Detail Specification is a supplementary document to the Sectional Specification and contains requirements for style, layout and minimum content of Detail Specifications

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EN-IEC 61643-331 is a test specification for metal oxide varistors (MOV), which are usedfor applications up to 1 000 V AC or 1 500 V DC in power lines, or telecommunication, orsignalling circuits. They are designed to protect apparatus or personnel, or both, from hightransient voltages.This document applies to MOVs having two electrodes and hybrid surge protectioncomponents. This document also does not apply to mountings and their effect on the MOV’scharacteristics. Characteristics given apply solely to the MOV mounted only in the waysdescribed for the tests.

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IEC 61643-331:2020 is available as IEC 61643-331:2020 RLV 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’s 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.

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IEC 61643-331:2017E) 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 MOV’s characteristics. Characteristics given apply solely to the MOV mounted only in the ways described for the tests. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Update of the nominal varistor voltage test method; b) Addition of thermally protected varistors – component symbol and test methods; c) Addition of nominal discharge current – test methods; d) Addition of voltage ratings for disc types (Table 1); e) Addition of test currents for clamping voltage of disc types (Table 2); f) Addition of typical voltage ratings of SMD types (Table 3); and g) Addition of Limited current and temporary overvoltage tests for thermally protected varistors. Keywords: metal oxide varistors (MOV), high transient voltages.

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This part of IEC 60393 applies to single-turn rotary low-power wirewound and non-wirewound
potentiometers, with a rated dissipation less than to 10 W. These potentiometers are primarily
intended for use in electronic equipment.
This part of IEC 60393 prescribes preferred ratings and characteristics and selects from
IEC 60393-1, appropriate quality assessment procedures, tests and measuring methods. It
provides general performance requirements for this type of potentiometer.
This standard gives the minimum performance requirements and test severities.

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This part of IEC 60393 applies to surface mount preset potentiometers for use in electronic
equipment.
This part of IEC 60393 prescribes preferred ratings and characteristics and selects from
IEC 60393-1, the appropriate quality assessment procedures, tests and measuring methods,
and it gives general performance requirements for this type of potentiometers.
This standard gives the minimum performance requirements and test severities.

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This part of IEC 60393 applies to lead-screw actuated and rotary preset potentiometers,
wirewound and non-wirewound for use in electronic equipment. These potentiometers are
primarily intended for use in circuits for trimming purposes which require infrequent
adjustments.
This part of IEC 60393 prescribes preferred ratings and characteristics and selects from
IEC 60393-1 the appropriate quality assessment procedures, tests and measuring methods. It
provides general performance requirements for this type of potentiometer.
This standard gives the minimum performance requirements and test severities.

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IEC 60393-5:2015 applies to single-turn rotary low-power wirewound and non-wirewound potentiometers, with a rated dissipation less than to 10 W. These potentiometers are primarily intended for use in electronic equipment. This part of IEC 60393 prescribes preferred ratings and characteristics and selects from IEC 60393-1, appropriate quality assessment procedures, tests and measuring methods. It provides general performance requirements for this type of potentiometer. This standard gives the minimum performance requirements and test severities. This edition includes the following significant technical changes with respect to the previous edition: a) revision of the information on the assessment level EZ and FZ (zero nonconforming); b) complete editorial revision.

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IEC 60393-6:2015 applies to surface mount preset potentiometers for use in electronic equipment. This part of IEC 60393 prescribes preferred ratings and characteristics and selects from IEC 60393-1, the appropriate quality assessment procedures, tests and measuring methods, and it gives general performance requirements for this type of potentiometers. This standard gives the minimum performance requirements and test severities. This edition includes the following significant technical changes with respect to the previous edition: a) revision of the information on the assessment level EZ (zero nonconforming); b) complete editorial revision.

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IEC 60393-2:2015 applies to lead-screw actuated and rotary preset potentiometers, wirewound and non-wirewound for use in electronic equipment. These potentiometers are primarily intended for use in circuits for trimming purposes which require infrequent adjustments. This part of IEC 60393 prescribes preferred ratings and characteristics and selects from IEC 60393-1 the appropriate quality assessment procedures, tests and measuring methods. It provides general performance requirements for this type of potentiometer. This standard gives the minimum performance requirements and test severities. This edition includes the following significant technical changes with respect to the previous edition: a) revision of the information on the assessment level EZ and FZ (zero nonconforming); b) complete editorial revision.

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IEC 60393-2:2015 applies to lead-screw actuated and rotary preset potentiometers, wirewound and non-wirewound for use in electronic equipment. These potentiometers are primarily intended for use in circuits for trimming purposes which require infrequent adjustments. This part of IEC 60393 prescribes preferred ratings and characteristics and selects from IEC 60393-1 the appropriate quality assessment procedures, tests and measuring methods. It provides general performance requirements for this type of potentiometer. This standard gives the minimum performance requirements and test severities. This edition includes the following significant technical changes with respect to the previous edition:
a) revision of the information on the assessment level EZ and FZ (zero nonconforming);
b) complete editorial revision.
This publication is to be read in conjunction with IEC 60393-1:2008.

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IEC 60393-5:2015 applies to single-turn rotary low-power wirewound and non-wirewound potentiometers, with a rated dissipation less than to 10 W. These potentiometers are primarily intended for use in electronic equipment. This part of IEC 60393 prescribes preferred ratings and characteristics and selects from IEC 60393-1, appropriate quality assessment procedures, tests and measuring methods. It provides general performance requirements for this type of potentiometer. This standard gives the minimum performance requirements and test severities. This edition includes the following significant technical changes with respect to the previous edition:
a) revision of the information on the assessment level EZ and FZ (zero nonconforming);
b) complete editorial revision.
This publication is to be read in conjunction with IEC 60393-1:2008.

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IEC 60393-6:2015 applies to surface mount preset potentiometers for use in electronic equipment. This part of IEC 60393 prescribes preferred ratings and characteristics and selects from IEC 60393-1, the appropriate quality assessment procedures, tests and measuring methods, and it gives general performance requirements for this type of potentiometers. This standard gives the minimum performance requirements and test severities. This edition includes the following significant technical changes with respect to the previous edition:
a) revision of the information on the assessment level EZ (zero nonconforming);
b) complete editorial revision.
This publication is to be read in conjunction with IEC 60393-1:2008.

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IEC 61753-091-2:2012 contains the minimum test and measurement requirements and severities which a fibre optic circulator as specified by IEC 62077 should satisfy in order to be categorized as meeting the requirements of circulators used in controlled environments as specified in IEC 61753-1. Keywords: fibre optic circulator

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This part of IEC 60393 is applicable to all types of resistive potentiometers, including leadscrew actuated types, presets, multi-turn units, etc. to be used in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. It has been mainly written, and the test methods described, to conform to the widely used single-turn rotary potentiometer with an operating shaft. For other types of potentiometers: - the angle of rotation may be several turns; - the reference to an operating shaft shall apply to any other actuating device; - the angular rotation shall be taken to mean mechanical travel of the actuating device; - a value for force shall be prescribed instead of a value for torque if the actuating device moves in a linear instead of a rotary manner. These alternative prescriptions will be found in the sectional or detail specification. When a component is constructed as a variable resistor, i.e. as a two-terminal device, the detail specification shall prescribe the modifications required in the standard tests.

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IEC/TR 62453-61:2009(E), which is a technical report, explains the guidelines and rules for the implementation of a Device Type Manager (DTM) with regard to the user interface and its functions. These guidelines and rules are part of the FDT specification and are intended to ensure that all users are provided with clear and consistent user interface functions and features across DTM devices in a system.

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IEC 60393-1:2008(E) is applicable to all types of resistive potentiometers, including lead-screw actuated types, presets, multi-turn units, etc. to be used in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. It has been mainly written, and the test methods described, to conform to the widely used single-turn rotary potentiometer with an operating shaft . This edition contains the following significant technical changes with respect to the previous edition: implementation of Annex H which replaces Section 3 of the previous edition. It also includes minor revisions related to tables, figures and references.

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IEC 60393-1:2008 is applicable to all types of resistive potentiometers, including lead- screw actuated types, presets, multi-turn units, etc., to be used in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. It has been mainly written, and the test methods described, to conform to the widely used single-turn rotary potentiometer with an operating shaft. This edition contains the following significant technical changes with respect to the previous edition: implementation of Annex H which replaces Section 3 of the previous edition. It also includes minor revisions related to tables, figures and references.

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Details the test specifications for metal oxide varistors (MOV), which are used for applications up to 1000 V a.c. or 1500 V d.c. in power line, or telecommunication, or signalling circuits. The MOVs are designed to protect apparatus or personnel, or both from high transient voltages. Does not deal with hybrid devices. Does not apply also to mountings and their effect on the MOVs characteristics.

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Supersedes CECC 41 101 Issue 2 * CECC WG 4B work handled by SR 40

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