Following the successive releases of the international standard IEC 62368-1:2023 (4th Edition) and the European harmonized standard EN IEC 62368-1:2024 (4th Edition), the U.S. standard UL 62368-1:2025 (4th Edition) was officially published on July 31, 2025, and was concurrently adopted as an American National Standard by the American National Standards Institute (ANSI) on the same day.
The release of UL 62368-1:2025 marks a significant new phase in the safety regulations for Audio/Video, Information, and Communication Technology (AV/ICT) equipment in the United States.
Update 1: Components Certified Under Legacy Standards No Longer Accepted
Certification of components/subassemblies based on the legacy standards IEC 60950-1 (for IT Equipment) or IEC 60065 (for Audio/Video Equipment) is no longer accepted. Manufacturers relying on such components must urgently review their Bill of Materials (BOM), as a significant number of components are expected to require re-certification or replacement.
Update 2: Revised Structure Requirements for Button Batteries
The standard has updated structural requirements for button batteries and now incorporates the safety requirements of UL 4200A (the Standard for Safety for Products Incorporating Button Batteries).
Update 3: Updated Requirements for External Circuits
The tables related to external circuit requirements have been revised. The definitions for classifying external circuits have been corrected to align with IEC TR 62102, and the overvoltage values for different circuit categories have been amended.
Update 4: Revised Openings in Fire Enclosures
Requirements for openings in fire enclosures have been updated, primarily focusing on corrections to the dimensional requirements for openings on the sides of enclosures.
Update 5: Enhanced Foreign Object Testing for Wireless Chargers
The requirements for Foreign Object Detection (FOD) testing in wireless chargers have been clarified. The standard now specifies that the centers of the wireless charger and the device-under-charge coils must be aligned (or assisted in alignment) prior to testing. Furthermore, two test conditions are now defined: Part A (power on before placing the foreign object) and Part B (place the foreign object before powering on).
Update 6: New Requirements for Fusible Resistors
For fusible resistors used as safety protective devices, a new requirement mandates that they must comply with IEC 60127-8.
Update 7: Expanded Requirements for Liquid Cooling Components
New requirements have been established for modular liquid cooling systems (LFCs) with a capacity exceeding 1 liter. These cover leak detection, fluid compatibility, and pressure relief, applying to thermal management scenarios in servers, high-performance computers, engraving machines, etc.
Update 8: Major Updates for Rechargeable Lithium Batteries
The standard introduces significant updates to requirements for rechargeable lithium batteries. This includes new mandatory requirements for stationary lithium battery systems, covering non-portable equipment like data center backup power supplies and large-scale energy storage installations. For batteries with segmented parameters, segmented testing is now explicitly required.
Update 9: New Fire Spread Test for Specific Enclosures
A new test for fire spread from an external ignition source is now required for equipment with mesh/grid structures, equipment using air-permeable materials, and equipment with surfaces covered by foam or textile.
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Post time: Nov-11-2025
