IEC 61811-1:2015

Overview

IEC 61811-1:2015 - Electromechanical telecom elementary relays of assessed quality - Part 1: Generic specification and blank detail specification - is the generic IEC standard that defines the structure, test methods and quality-assessment procedures for electromechanical relays intended for telecommunication applications. The standard consolidates requirements for telecom relays, selects appropriate test methods (from the IEC 61810 series and other sources), and provides blank detail-specification templates and basic test schedules to be used when preparing device-specific detail specifications.

This second edition cancels earlier IEC 61811 parts and constitutes a technical revision to create a single document for telecom relays and to update relevant normative references.

Key topics and technical requirements

The standard covers technical and quality topics including:

• Rated values and electrical characteristics: rated coil voltages, contact-circuit resistance, insulation and dielectric requirements, impulse-voltage tests and insulation resistance.
• Marking and documentation: relay and package marking, coded manufacture date and required documentation for ordering and certification.
• Test methods and schedules: selection and sequencing of tests, groupings (Group A, B, C), order of tests and standard test conditions.
• Quality assessment procedures: primary manufacture controls, qualification approval, quality conformance inspection, periodic inspection, sampling, lot formation and screening procedures.
• Endurance and reliability: electrical and mechanical endurance testing, number of operations for endurance classifications, contact failure-rate definitions and reliability data analysis (Annex A describes Weibull and WeiBayes approaches).
• Specification templates and characteristic data: blank detail-specification templates (Annex C) and recommended characteristic values for coil, contacts, mounting and environmental performance (Annex B).

Practical applications and who uses this standard

IEC 61811-1 is primarily aimed at:

• Relay manufacturers - to prepare product detail specifications, qualify relay designs and implement standardized test schedules.
• Telecom equipment designers and procurement teams - to select relays with assessed quality and ensure suppliers meet defined test and marking requirements.
• Test laboratories and quality-assurance engineers - to perform standardized tests, sample inspection and reliability assessments.
• Industrial users - where telecom-grade electromechanical relays are applied in control systems and require traceable quality and endurance data.

Using IEC 61811-1 helps reduce variability between suppliers, speeds qualification and supports consistent reliability and traceability in telecom and related industrial applications.

Related standards

• IEC 61810 series (relay general test methods and requirements) - IEC 61811-1 selects appropriate methods from these documents.
• Other referenced IEC normative documents (updated in this edition) as listed in the standard’s normative references.

Keywords: IEC 61811-1, electromechanical telecom relays, telecom relays, relay testing, relay quality assessment, IEC standards, generic specification, detail specification, relay reliability, WeiBayes, Weibull.