IEC 61169-1-3:2026

Overview

IEC 61169-1-3:2026 defines the performance requirements and testing methods for surge protective devices (SPDs) built into coaxial radio-frequency (RF) connectors. Issued by the International Electrotechnical Commission (IEC), this international standard is specifically intended for SPD use in telecommunications and signalling networks to provide protection against transient overvoltages caused by lightning and electrical surges. By integrating SPDs directly into coaxial connectors, the standard aims to safeguard electronic equipment connected to networks with nominal voltages up to 1 000 V AC and 1 500 V DC.

SPDs described in this standard include several types: gas discharge tube (GDT), ¼ wavelength short stub, flash-off gap, and hybrid designs. These devices ensure reliable surge current diversion and mitigate damage to sensitive electrical apparatus.

Key Topics

• Scope of Protection: The standard covers surge protection for telecom and signalling networks, addressing direct and indirect lightning effects as well as other transient surges.
• Built-in SPD Types:
  • Gas discharge tube (GDT) type
  • ¼ wavelength short stub type
  • Flash-off gap type
  • Hybrid configurations
• Service and Test Conditions:
  • Service ambient conditions, including air pressure, temperature ranges (–40°C to +70°C), and humidity (up to 100% for outdoor enclosures)
  • Abnormal service conditions and device conditioning protocols
• Electrical Requirements:
  • Sparkover voltage limits in line with IEC 61643-311
  • Return loss (VSWR), insertion loss, and insulation resistance requirements
• Performance Testing:
  • Testing for DC sparkover, impulse sparkover, and impulse durability using prescribed procedures
  • Use of standardized test circuits and measurement setups to verify SPD characteristics
  • Requirements for testing at extreme temperatures for accurate performance assessment
  • Evaluation before and after surge endurance testing to ensure continued compliance
• Test Equipment:
  • Withstand voltage testers, oscilloscopes, high-voltage probes, and lightning surge testers for different test setups

Applications

IEC 61169-1-3:2026 is essential for manufacturers, designers, and operators of RF connectors and telecommunications infrastructure aiming for enhanced surge protection. Key practical applications include:

• Telecommunications Networks: Protecting base stations, switching equipment, and transmission lines from service disruptions or failures due to lightning surges.
• Broadcast and Data Communication: Safeguarding sensitive electronics connected via coaxial cabling from voltage spikes.
• Industrial and Signalling Installations: Ensuring system reliability by complying with international surge withstand requirements in critical industrial communications and SCADA systems.
• Equipment Manufacturing: Enabling connector OEMs and SPD manufacturers to design, specify, and test built-in surge protection that meets rigorous IEC standards.
• Field Installation and Maintenance: Assisting technicians and engineers in verifying connector and SPD performance under a wide range of operational conditions.

By standardizing SPD integration and testing in coaxial connectors, organizations can achieve higher equipment protection, network reliability, and safety compliance.

Related Standards

A range of IEC and ITU standards relate to the implementation and testing of surge protective devices:

• IEC 61083-1 - Instruments for high-voltage impulse tests
• IEC 61169-1 & IEC 61169-1-2 - General requirements for RF connectors and specific electrical test methods
• IEC 61643-311 - Performance requirements for gas discharge tubes in surge protective devices
• IEC 61643-21 - SPDs for telecommunications and signalling networks
• IEC 60068-series - Environmental testing for electrical equipment
• ITU-T Recommendations K.12, K.20, K.21, K.55, and K.65 - Specifications for SPDs and resistibility testing in telecommunication environments

Adhering to IEC 61169-1-3:2026 and its related standards ensures international compatibility, safety, and the reliability of surge protection in modern telecom and data networks.