BS EN IEC 61558-2-4:2025

Safety of Transformers, Reactors, Power Supply Units and Combinations Thereof

Particular Requirements and Tests for Isolating Transformers and Power Supply Units Incorporating Isolating Transformers for General Applications

Introducing the BS EN IEC 61558-2-4:2025, a comprehensive standard that sets the benchmark for safety in the design and operation of isolating transformers and power supply units. This standard is essential for manufacturers, engineers, and safety professionals who are committed to ensuring the highest levels of safety and performance in electrical equipment.

Released on March 20, 2025, this standard is the latest in the series, reflecting the most current advancements and safety protocols in the industry. With a total of 20 pages, it provides detailed guidelines and requirements that are crucial for the safe operation of transformers and power supply units.

Key Features:

• Standard Number: BS EN IEC 61558-2-4:2025
• ISBN: 978 0 539 05619 8
• Status: Standard

This standard is part of the broader IEC 61558 series, which is internationally recognized for its rigorous approach to safety in electrical transformers and power supply units. The BS EN IEC 61558-2-4:2025 specifically addresses the particular requirements and tests for isolating transformers and power supply units that incorporate isolating transformers, making it indispensable for general applications across various industries.

Why Choose BS EN IEC 61558-2-4:2025?

The importance of safety in electrical equipment cannot be overstated. Isolating transformers and power supply units are critical components in many electrical systems, and their safe operation is paramount. The BS EN IEC 61558-2-4:2025 standard provides a robust framework for ensuring that these components meet stringent safety requirements, thereby reducing the risk of electrical hazards.

By adhering to this standard, manufacturers and engineers can ensure that their products are not only compliant with international safety regulations but also optimized for performance and reliability. This is particularly important in industries where electrical safety is a top priority, such as healthcare, industrial automation, and consumer electronics.

Comprehensive Testing and Requirements

The BS EN IEC 61558-2-4:2025 standard outlines specific tests and requirements that isolating transformers and power supply units must meet. These include:

• Electrical insulation and dielectric strength tests to ensure the integrity of the transformer under various operating conditions.
• Thermal performance tests to evaluate the ability of the transformer to operate safely at different temperatures.
• Mechanical strength tests to assess the durability and robustness of the transformer structure.
• Protection against electric shock to prevent accidental contact with live parts.

These tests are designed to simulate real-world conditions and ensure that the transformers and power supply units can withstand the demands of their intended applications. By passing these tests, products demonstrate their capability to provide safe and reliable performance over their operational lifespan.

Global Relevance and Application

The BS EN IEC 61558-2-4:2025 standard is recognized globally, making it a valuable asset for companies operating in international markets. Compliance with this standard not only enhances product safety but also facilitates market access and acceptance in regions where IEC standards are mandated or preferred.

For businesses looking to expand their reach, adopting this standard can be a strategic move to align with global safety expectations and demonstrate a commitment to quality and safety. It also provides a competitive edge by showcasing adherence to internationally recognized safety protocols.

Conclusion

In conclusion, the BS EN IEC 61558-2-4:2025 is an essential standard for anyone involved in the design, manufacture, or use of isolating transformers and power supply units. Its comprehensive guidelines and rigorous testing requirements ensure that these critical components meet the highest safety standards, providing peace of mind to manufacturers, engineers, and end-users alike.

Investing in compliance with this standard is an investment in safety, reliability, and global marketability. Ensure your products are at the forefront of safety and performance by aligning with the BS EN IEC 61558-2-4:2025 standard.

BS EN IEC 61558-2-4:2025

This standard BS EN IEC 61558-2-4:2025 Safety of transformers, reactors, power supply units and combinations thereof is classified in these ICS categories:

• 31.020 Electronic components in general
• 29.180 Transformers. Reactors

Replacement This part of IEC 61558 deals with the safety of isolating transformers for general applications and power supply units incorporating isolating transformers for general applications. Transformers incorporating electronic circuits are also covered by this document. NOTE 1 Safety includes electrical, thermal and mechanical aspects. Unless otherwise specified, from here onward, the term transformer covers isolating transformers for general applications and power supply units incorporating isolating transformers for general applications. For power supply units (linear) this document is applicable. For switch mode power supply units, IEC 61558-2-16 is applicable. This document is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated dry- type transformers. The windings can be encapsulated or non-encapsulated. The rated supply voltage does not exceed 1 000 V AC and the rated supply frequency and the internal operating frequencies do not exceed 500 Hz. The rated output does not exceed: - 25 kVA for single-phase transformers; - 40 kVA for polyphase transformers. This document is applicable to transformers without limitation of the rated output subject to an agreement between the purchaser and the manufacturer. NOTE 2 Transformers intended to supply distribution networks are not included in the scope. The no-load output voltage or the rated output voltage does exceed 50 V AC or 120 V ripplefree DC, and where applicable, does not exceed 500 V AC or 708 V ripple-free DC. The no-load output voltage and the rated output voltage may be up to 1 000 V AC or 1 415 V ripple-free DC for special applications. This document is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers. NOTE 3 Transformers covered by this document are used in applications where double or reinforced insulation between circuits is required by the installation rules or by the end product standard. Attention is drawn to the following: - additional requirements for transformers intended to be used in vehicles, on board ships, and aircraft (from other applicable standards, national rules, etc.); - measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing; - the different conditions for transportation, storage, and operation of the transformers; - additional requirements in accordance with other appropriate standards and national rules can be applicable to transformers intended for use in special environments. Future technological development of transformers can necessitate a need to increase the upper limit of the frequencies. Until then, this document may be used as a guidance document. This group safety publication focusing on safety guidance is primarily intended to be used as a product safety standard for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products similar to those mentioned in the scope of this group safety publication, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51. One of the responsibilities of a TC is, wherever applicable, to make use of BSPs and/or GSPs in the preparation of its publications.