February 2026: Dielectric Strength Testing Standard Released for Electrical Engineering

Electrical engineering professionals have a crucial new resource as of February 2026 with the release of EN IEC 63522-4:2026, the international standard defining robust test methods for assessing dielectric strength in electrical relays. This single but significant standard sets out clear guidelines to verify that relays can withstand high voltages throughout their intended life cycle—from storage and transport to operational use. As automation, safety, and power system demands grow, such standards are vital for ensuring product reliability and market access.

Overview / Introduction

The electrical engineering sector underpins modern infrastructure, automation, and safety systems worldwide. In this context, standards play a pivotal role—they ensure components like relays are designed, tested, and certified for consistent performance and safety across diverse operational environments.

This article explores the latest developments in electrical relay testing standards, focusing on EN IEC 63522-4:2026, published in February 2026. Readers will gain insights into:

• The scope and practical application of the new dielectric strength test
• Technical and regulatory requirements
• Compliance best practices
• How these changes benefit engineers, manufacturers, and end-users

Detailed Standards Coverage

EN IEC 63522-4:2026 - Electrical Relays Dielectric Strength Test

Electrical Relays – Tests and Measurements – Part 4: Dielectric Strength Test

EN IEC 63522-4:2026 provides a comprehensive framework for evaluating the dielectric strength of electrical relays—a critical safety and reliability criterion. The standard is designed to ensure devices under test (DUTs) can operate reliably during expected conditions of storage, transportation, and use, resisting electrical breakdowns that could result from overvoltage, surges, or insulation failures.

Scope and Purpose:

The standard applies to the testing and measurement procedures that prove a relay's insulation can withstand specified voltages without breakdown. It is intended for use with other parts of the EN IEC 63522 series for a holistic approach to relay qualification.

Key Requirements and Specifications:

• Pre-conditioning: DUTs must undergo pre-conditioning before testing to simulate real-world aging and storage effects.
• Dielectric Strength Test: Specifies test voltages, waveform shapes, tolerances, and minimum test currents. The procedure determines the maximum voltage a relay's insulation can resist without electrical breakdown.
• Test Equipment: Standardizes requirements for generators, measurement circuits, and alternative test configurations to ensure result consistency.
• Environmental Considerations: Testing accounts for variations in temperature, humidity, and other factors that may affect dielectric properties.

Who Needs to Comply:

• Relay manufacturers serving industries such as power systems, automation, transportation, and heavy machinery
• Quality managers and certification bodies overseeing relay reliability and safety
• Electrical engineering professionals specifying components for critical applications

Practical Implementation:

Adopting EN IEC 63522-4:2026 ensures that electrical relays are robust against insulation failures—key for safety-critical systems like substations, railways, or industrial control panels. Compliance also streamlines certification processes and supports international trade by aligning with global best practices.

Notable Changes:

• Updated procedures and clearer requirements compared to prior editions
• Enhanced guidance on test voltages, equipment tolerances, and environmental pre-conditioning
• Improved harmonization with related standards (e.g., EN IEC 60068-2 and EN 61180) for environmental and high-voltage testing

Key highlights:

• Defines standardized dielectric strength test methods for relays
• Details strict procedures for pre-conditioning and high-voltage application
• Supports certification, safety, and functional reliability in demanding environments

Access the full standard:View EN IEC 63522-4:2026 on iTeh Standards

Industry Impact & Compliance

EN IEC 63522-4:2026 delivers significant benefits for the electrical engineering industry:

• Enhanced Safety: By specifying rigorous testing procedures, it minimizes the risk of relay failure under field conditions—critical for power grids, industrial automation, and transportation.
• Global Acceptance: Harmonization with IEC and CENELEC requirements eases international procurement and certification.
• Regulatory Compliance: Ensures manufacturers meet the latest compliance obligations, supporting CE marking and other market access certifications.

Compliance Timeline:

• Implementation deadline at the national level: February 28, 2027
• Withdrawal of conflicting standards: February 28, 2029

Adoption Strategies:

1. Review current test protocols against the new standard
2. Upgrade testing equipment and procedures as needed
3. Train quality and engineering teams on revised requirements
4. Engage with accredited certification bodies for compliance validation

Risks of Non-Compliance:

• Increased risk of product failure or recall
• Potential market exclusion or regulatory penalties
• Loss of customer confidence and reputational damage

Technical Insights

Common Technical Requirements

• Test Voltage: Selection based on relay type, rated insulation voltage, and application; both alternating (AC) and impulse voltages addressed.
• Waveshape and Tolerance: Clampdown on deviation to ensure repeatable, reliable results across test laboratories.
• Minimum Test Current: Table-driven approach ensures adequate detection of insulation breakdown.
• Environmental Factors: Simulated through pre-conditioning requirements—temperature and humidity.

Implementation Best Practices

• Regular calibration of high-voltage test equipment
• Storage and aging simulation for real-world relevance
• Verification against referenced standards, such as EN 60068-2 (environmental) and EN 61180 (low-voltage high-voltage testing)
• Robust documentation for audit trails and certification

Testing & Certification Considerations

• Use only accredited labs to carry out dielectric strength tests
• Maintain traceable records of all pre-conditioning, testing steps, and results
• Integrate results with broader relay qualification and risk management programs

Conclusion / Next Steps

The release of EN IEC 63522-4:2026 marks a significant step forward in harmonizing, modernizing, and strengthening relay qualification standards for the electrical engineering sector. By adopting this standard, organizations increase the safety, reliability, and marketability of their products while streamlining global compliance.

Key Takeaways:

• Early adoption positions manufacturers for regulatory readiness
• Upgraded testing and reporting enhance trust and credibility
• Ongoing staff education is essential as standards evolve

Recommended Actions:

1. Download and review the full text of EN IEC 63522-4:2026
2. Audit your existing relay products and testing procedures
3. Update internal processes and documentation as required
4. Stay connected with iTeh Standards for future updates and best practices

Access the full standard now:View EN IEC 63522-4:2026 on iTeh Standards

For further resources, in-depth guides, and ongoing updates in electrical engineering standards, visit iTeh Standards.