Path: Home > GB/T > Page727 > GB/T 27746-2025

Price & Delivery

US$859.00 · In stock · Download in 9 seconds
GB/T 27746-2025: Technical specification for metal oxide varistors (MOV) used in low-voltage apparatus
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Status: Valid

Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 27746-2025	English	859	Add to Cart	6 days [Need to translate]	Technical specification for metal oxide varistors (MOV) used in low-voltage apparatus
GB/T 27746-2011	English	879	Add to Cart	6 days [Need to translate]	Technical specification for metal oxide varistors (MOV) used in low-voltage apparatus

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

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 29.120.01 CCSK30 National Standards of the People's Republic of China Replaces GB/T 27746-2011 Metal oxide varistor for low-voltage electrical appliances Resistor (MOV) Technical Specifications low-voltage apparatus Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III Introduction IV 1.Scope 1 2 Normative References 1 3.Terms and definitions, symbols and abbreviations 2 3.1 Terms and Definitions 2 3.2 Symbols and Abbreviations 6 4 categories 7 4.1 Differentiate according to the nominal varistor voltage of the MOV 7 4.2 Differentiate according to MOV installation method 7 4.3 Differentiate according to the special functions of MOV 7 4.4 Classification based on the main material of MOV 7 5 Rated value 7 5.1 Ratings of leaded low-voltage MOVs 7 5.2 Ratings of lead-wire high-voltage MOVs 8 5.3 Ratings of surface mount MOVs 10 6.Usage conditions 10 6.1 Normal operating conditions 10 6.2 Extended Usage Conditions 11 7 Technical Requirements 11 7.1 General Requirements 11 7.2 Electrical Requirements 11 7.3 Terminal requirements 13 7.4 Environmental Requirements 13 8.Test Methods 14 8.1 General Requirements 14 8.2 General Inspection 14 8.3 Electrical Tests 15 8.4 Lead-out test 21 8.5 Environmental Testing 23 9.Inspection Rule 25 9.1 Test Classification 25 9.2 Type testing 25 9.3 Batch-by-batch inspection 26 9.4 Periodic Inspection 27 Appendix A (Normative) Test Pulse 29 A.1 Type of Test Pulse 29 A.2 Terms and Definitions 29 A.3 Permissible deviation 30 Appendix B (Normative) Installation Method for Measuring SMV Type MOV 33 B.1 Installation Example 33 B.2 Substrate Requirements 33 B.3 Wave soldering 33 B.4 Reflow Soldering 34 Appendix C (Informative) MOV Failure and Failure Modes 35 C.1 Deterioration Failure Mode 35 C.2 Short-circuit fault mode 35 C.3 High Limiting Voltage Failure Mode 35 C.4 Leakage current ramp-up failure mode 35 C.5 Pin or terminal burn-out failure mode 35 C.6 Resistor fracture fault mode 35 References 36

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document supersedes GB/T 27746-2011 "Technical Specification for Metal Oxide Varistors (MOVs) for Low-Voltage Electrical Appliances" and is consistent with... Compared with GB/T 27746-2011, apart from structural adjustments and editorial changes, the main technical changes are as follows. ---Added the terms and definitions for "varistor voltage," "AC leakage current," and "DC leakage current" (see 3.1.11, 3.1.16, and 3.1.17); ---Added rated standard values for leaded high-voltage MOVs with nominal varistor voltages of 1400V, 1600V, and 1800V. (See Table 4); ---The temperature-voltage stress stability test has been removed (see 7.2.7 in the.2011 edition). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee on Standardization of Low Voltage Electrical Appliances (SAC/TC189). This document was drafted by. Shanghai Electrical Apparatus Research Institute, Changzhou Chuangjie Lightning Protection Electronics Co., Ltd., and Suzhou Yieryi Electrical Manufacturing Co., Ltd. The company, Yunnan Xingsheng Electric Power Technology Co., Ltd., Hangzhou Breco Electric Co., Ltd., and Shanghai University of Electric Power. The main drafters of this document are. Jia Feng, Shu Jing, Li Chengli, Yao Guojun, Jiang Zhuangxian, and Bian Xiaoyan. The release history of this document and the document it replaces is as follows. ---First published in.2011 as GB/T 27746-2011; ---This is the first revision.

Introduction

Low-voltage electrical appliances operate in circuits with a rated AC voltage of 1000V, DC voltage of 1500V and below, and are used for circuit switching and control. Electrical appliances that perform detection, protection, transformation, and regulation functions are fundamental components of complete sets of electrical equipment, used in large quantities and with wide applications. Low-voltage electrical... When used in a circuit, the device inevitably encounters lightning overvoltages, switching overvoltages, and electrostatic discharges conducted from the circuit. These overvoltages can... Overvoltage can cause arcing at electrical contacts, accelerate the aging and damage of device insulation, or interfere with adjacent circuits. Therefore, overvoltage suppression devices must be used to limit these overvoltages. Within safe limits. Currently, metal oxide varistors (MOVs) are widely used and economical in low-voltage electrical appliances for suppressing overvoltages. Device. This document, based on the application environment and specific usage of low-voltage electrical appliances, proposes technical requirements for MOVs that meet the usage requirements of low-voltage electrical appliances. This document outlines requirements, test methods, and inspection rules. Its purpose is to provide technical guidance for manufacturers and users of MOVs for low-voltage electrical applications. The guide coordinates the requirements of both parties to ensure that the MOV can achieve the intended protection function in low-voltage electrical appliances. Metal oxide varistor for low-voltage electrical appliances Resistor (MOV) Technical Specifications

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) ...