GB/T 21711.3-2025 English PDF

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GB/T 21711.3-2025: Electromechanical elementary relays - Part 3: Relays with forcibly guided (mechanically linked) contacts
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21711.3-2025	234	Add to Cart	3 days	Electromechanical elementary relays - Part 3: Relays with forcibly guided (mechanically linked) contacts	Valid

Similar standards

GB/T 17737.104   GB/T 17738.2   GB/T 21711.10   GB/T 21711.2   GB/T 21711.1   

Basic data

Standard ID: GB/T 21711.3-2025 (GB/T21711.3-2025)
Description (Translated English): Electromechanical elementary relays - Part 3: Relays with forcibly guided (mechanically linked) contacts
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: L25
Classification of International Standard: 29.120.70; 31.220.99
Word Count Estimation: 11,138
Date of Issue: 2025-05-30
Date of Implementation: 2025-05-30
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 21711.3-2025: Electromechanical elementary relays - Part 3: Relays with forcibly guided (mechanically linked) contacts

---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 29.120.70;31.220.99 CCSL25 National Standard of the People's Republic of China Basic Electromechanical Relays Part 3.Positive positioning (mechanical interlocking) contacts Relay (IEC 61810-3.2015,IDT) Released on 2025-05-30 2025-05-30 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Functional Requirements 2 4.1 Forced positioning (mechanical interlock) operation 2 4.2 Changeover contact 2 4.3 Mechanical durability 2 4.4 Electrical durability 3 4.5 Working conditions 3 4.5.1 Ambient temperature 3 4.5.2 Excitation 3 4.6 Characteristic values and markings 3 4.6.1 Characteristic value 3 4.6.2 Sign 3 5 Verification and type testing 4 5.1 Design Verification 4 5.2 Type test 4 5.3 Test Procedure 4 5.3.1 Disconnection failure test 4 5.3.2 Mechanical and electrical durability 5 References 6 Figure 1 A-type forced positioning (mechanical interlocking) contact group symbol 3 Figure 2 Symbols for Type B relays 4

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is part 3 of GB/T 21711 "Basic electromechanical relays". GB/T 21711 has been published in the following parts. --- Part 1.General and safety requirements; --- Part 2.Reliability; --- Part 2-1.Reliability B10 value verification procedure; --- Part 3.Forced positioning (mechanical interlocking) contact relays; --- Part 7.Test and measurement procedures; --- Part 10.Additional functional characteristics and safety requirements for large capacity relays. This document is equivalent to IEC 61810-3.2015 "Basic electromechanical relays Part 3.Forced positioning (mechanical interlocking) contact relays "Instrument". Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee for Standardization of Electrical Relays (SAC/TC217). This document was drafted by. Xiamen Hongfa Electroacoustic Co., Ltd., Zhangzhou Hongfa Electroacoustic Co., Ltd., Xinda Electric Co., Ltd., Zhejiang Hongfa Industrial Automation Control Electronics Co., Ltd. and China Electronics Technology Standardization Institute. The main drafters of this document. Zhou Yanmei, Lin Weilin, Jiang Zhichen, Zhu Yiqing, Wen Qihong and Wang Jue.

Introduction

In order to standardize the development, testing, quality assessment and use of relay products in my country and promote the steady and coordinated development of the relay industry, this GB/T 21711.GB/T 21711 is the basic product specification for various basic electromechanical relays and is intended to consist of seven parts. --- Part 1.General and safety requirements. The purpose is to determine the basic electromechanical relays used in various fields of electrical or electronic engineering Functional and safety requirements and safety related characteristics. --- Part 2.Reliability. The purpose is to standardize the requirements for reliability assessment of basic electromechanical relays. --- Part 2-1.Reliability B10 value verification procedure. The purpose is to standardize the reliability index assessment of basic electromechanical relays and reliability growth requirements assessment requirements. --- Part 3.Forced positioning (mechanical interlocking) contact relays. The purpose is to add applicable Special requirements for forced positioning (mechanical interlocking) contact relays. --- Part 4.General and safety requirements for reed relays. The purpose is to provide reed relays suitable for general control circuits. Establish basic functional and safety requirements. --- Part 7.Test and measurement procedures. The purpose is to specify the test and measurement procedures applicable to basic electromechanical relays. --- Part 10.Additional functional characteristics and safety requirements for large capacity relays. The purpose is to build on the general requirements of Part 1. In addition, additional functional characteristics and safety requirements applicable to large-capacity relays are added. Basic Electromechanical Relays Part 3.Positive positioning (mechanical interlocking) contacts Relay

1 Scope

This document specifies specific requirements and tests for positive position (mechanical interlock) contact based relays. These requirements are based on Special requirements based on the general requirements of GB/T 21711.1. NOTE 1 This document does not apply to electromechanical control circuit appliances as described in IEC 60947-5-1. NOTE 2 IEC 61810-2-1 provides guidance on the evaluation of reliability values. NOTE 3 This document does not consider contacts that are not positively positioned (mechanically interlocked).

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 21711.1-2023 Basic electromechanical relays Part 1.General and safety requirements (IEC 61810-1.2015, IDT) IEC 60947-5-1 Low-voltage switchgear and controlgear Part 5-1.Control circuits and switching elements Electromechanical control circuits Note. GB/T 14048.5-2017 Low-voltage switchgear and controlgear Part 5-1.Control circuit devices and switching elements Electromechanical control circuits Electrical appliances (IEC 60947-5-1.2016, MOD) Note. GB/T 21711.7-2018 Basic electromechanical relays Part 7.Test and measurement procedures (IEC 61810-7.2006, IDT)

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 elementaryrelay An all or nothing relay that operates and releases without any predetermined delay. NOTE. In this document, the word “foundation” is sometimes omitted for clarity. [Source. GB/T 2900.63-2003, 444-01-03, modified] 3.2 Failure to open A fault or failure condition where the contacts do not open as expected. ......

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