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GB/T 27746-2025Technical specification for metal oxide varistors (MOV) used in low-voltage apparatus (English PDF)

低压电器用金属氧化物压敏电阻器（MOV）技术规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 31, 2025

Implementation date

May 1, 2026

Scope

GB/T 27746-2025 is the English-translated version of 低压电器用金属氧化物压敏电阻器（MOV）技术规范.

GB/T 27746-2025 is the Chinese standard "Technical specification for metal oxide varistors (MOV) used in low-voltage apparatus". Its scope clause reads: This document applies to electrical equipment with AC voltage not exceeding 1000V (RMS), 50/60Hz and/or DC voltage not exceeding 1500V.

Metal oxide varistors (hereinafter referred to as "MOVs") are used to suppress transient overvoltages to protect the safety of electrical equipment.

The purpose of this document is to specify the use of MOVs in low-voltage electrical appliances. ---definition; ---Classification; --- Rated value; ---Usage conditions; ---Technical Requirements; ---Experimental methods; ---Inspection rules.

Metal oxide varistors for low-voltage surge protectors comply with the requirements of GB/T 18802.331. Note. This document can be used as a reference for electrical appliances with a rated AC voltage of 1140V.

Performance requirements for electrical appliances shall be determined through negotiation between the manufacturer and the user.

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Document preview — GB/T 27746-2025

National Standard of the People's Republic of China

ICS: 29.120.01
Classification: K 30
Replacing: GB/T 27746-2011

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
Introduction
1.Scope
2 Normative References
3.Terms and definitions, symbols and abbreviations
3.1 Terms and Definitions
3.2 Symbols and Abbreviations
4 categories
4.1 Differentiate according to the nominal varistor voltage of the MOV
4.2 Differentiate according to MOV installation method
4.3 Differentiate according to the special functions of MOV
4.4 Classification based on the main material of MOV
5 Rated value
5.1 Ratings of leaded low-voltage MOVs
5.2 Ratings of lead-wire high-voltage MOVs
5.3 Ratings of surface mount MOVs
6.Usage conditions
6.1 Normal operating conditions
6.2 Extended Usage Conditions
7 Technical Requirements
7.1 General Requirements
7.2 Electrical Requirements
7.3 Terminal requirements
7.4 Environmental Requirements
8.Test Methods
8.1 General Requirements
8.2 General Inspection
8.3 Electrical Tests
8.4 Lead-out test
8.5 Environmental Testing
9.Inspection Rule
9.1 Test Classification
9.2 Type testing
9.3 Batch-by-batch inspection
9.4 Periodic Inspection
Appendix A (Normative) Test Pulse
Appendix B (Normative) Installation Method for Measuring SMV Type MOV
Appendix C (Informative) MOV Failure and Failure Modes
References

1 Scope

This document applies to electrical equipment with AC voltage not exceeding 1000V (RMS), 50/60Hz and/or DC voltage not exceeding 1500V.

Metal oxide varistors (hereinafter referred to as "MOVs") are used to suppress transient overvoltages to protect the safety of electrical equipment.

The purpose of this document is to specify the use of MOVs in low-voltage electrical appliances.

---definition;

---Classification;

--- Rated value;

---Usage conditions;

---Technical Requirements;

---Experimental methods;

---Inspection rules.

Metal oxide varistors for low-voltage surge protectors comply with the requirements of GB/T 18802.331.

Note. This document can be used as a reference for electrical appliances with a rated AC voltage of 1140V. Performance requirements for electrical appliances shall be determined through negotiation between the manufacturer and the user.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 2423.3-2016 Environmental Testing - Part 2.Test Methods - Test Cab. Constant Damp Heat Test

GB/T 2423.22-2012 Environmental Testing - Part 2.Test Methods - Test N. Temperature Change

GB/T 2423.28-2005 Environmental testing of electrical and electronic products - Part 2.Test methods - Test T. Soldering

GB/T 2423.30-2013 Environmental Testing - Part 2.Test Methods - Test XA and Guidelines. Immersion in Cleaning Agents

GB/T 5169.5-2020 Fire Hazard Testing of Electrical and Electronic Products - Part 5.Test Flame Needle Flame Test Method and Apparatus

Recognize test methods and guidelines

GB/T 5169.10-2017 Fire Hazard Testing of Electrical and Electronic Products - Part 10.Basic Test Method for Glow Wire/Hot Wire

Hot Wire Apparatus and General Test Methods

GB/T 17627-2019 High-voltage testing techniques for low-voltage electrical equipment. definitions, test and procedural requirements, and test equipment.

GB/T 18802.331-2024 Low-voltage surge protection components - Part 331.Metal oxide varistors (MOVs)

Requirements and test methods

IEC 60068-2-21.2021 Environmental testing for electrical and electronic products - Part 2.Test methods - Test U. Lead-out and overall safety gralmountingdevices)

Note. GB/T 2423.60-2008 Environmental testing for electrical and electronic products - Part 2.Test methods - Test U. Strength of leads and integral mounting components (IEC)

60068-2-21.2006)

GB/T 36277 | GB/T 34130.21 | GB/T 34130.1 | GB/T 11918.1 | GB/T 27745 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 40 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60068

Editions of GB/T 27746

Edition	Title	Revision	Status
GB/T 27746-2025	Technical specification for metal oxide varistors (MOV) used in low-voltage apparatus	current edition	Current
GB/T 27746-2011	Technical specification for metal oxide varistors (MOV) used in low-voltage apparatus	previous edition	In force

This page sells the current edition, GB/T 27746-2025. Earlier editions are listed for reference only.

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