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What is EN 48135?

EN48135 is a technical standard employed in various industries that deal with electronic devices and equipment. It specifically focuses on the safety requirements and test methods for small transformers and power supply units (PSUs) used in these devices. This article will delve into the details of EN48135, including its scope, key requirements, and how it impacts the design and manufacturing processes.

The Scope of EN48135

EN48135 applies to small transformers and PSUs with an output power ranging from 1 watt to 500 watts. These devices are commonly found in household appliances, communication equipment, lighting systems, and electronic toys. The standard defines the safety aspects related to electrical, thermal, mechanical, and chemical hazards posed by these devices during their use. It sets forth the guidelines to ensure the protection of end-users and prevents any potential risks or accidents.

Key Requirements of EN48135

EN48135 outlines several key requirements that manufacturers must adhere to when designing and producing small transformers and PSUs. These include electrical insulation, protective earthing, overcurrent protection, temperature limits, creepage and clearance distances, and the prevention of fire hazards. Compliance with these requirements not only ensures the safety of the end-user but also guarantees the proper operation and reliability of the electronic device itself.

Impact on Design and Manufacturing Processes

The implementation of EN48135 has significant implications for both the design and manufacturing processes of small transformers and PSUs. Design engineers have to meticulously consider the safety aspects laid out in the standard while developing new products. They must carefully select appropriate materials, minimize clearance distances, incorporate protective mechanisms, and carry out thorough testing to comply with the standard's requirements. Manufacturers, on the other hand, need to establish strict quality control processes to consistently meet EN48135 standards during production.


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