IEC 62040-1 specifies the safety requirements for uninterruptible power systems (UPS), published by the International Electrotechnical Commission (IEC). UPS systems store energy — typically in valve-regulated lead-acid (VRLA) or lithium-ion batteries — and release it to protect critical loads from power interruptions. IEC 62040-1 governs the safety of the complete UPS system including its battery, charger, inverter, and switchgear, making it directly relevant to battery engineers designing or supplying batteries for UPS applications.
Published by: International Electrotechnical Commission (IEC)
Current edition: IEC 62040-1:2017 (3rd edition)
Adopted as: EN IEC 62040-1:2019 (Europe)
Companion standards: IEC 62040-2 (EMC), IEC 62040-3 (performance), IEC 60896-22 (VRLA batteries), IEC 62133-2 (Li portable cells)
Scope
IEC 62040-1 applies to movable, stationary, and fixed electronic UPS systems with an output voltage not exceeding 1,000 V AC or 1,500 V DC. It covers UPS for use in information technology environments, industrial applications, healthcare facilities, and data centres. The standard addresses electrical safety, mechanical safety, thermal safety, battery safety, and protection against fire and explosion hazards within the complete UPS assembly.
Key Requirements
IEC 62040-1 specifies requirements for protection against electric shock (insulation, earthing, creepage and clearance distances), protection against fire (flammability of materials, thermal cut-offs), battery management (charge voltage limits, temperature monitoring, venting requirements for VRLA batteries, and cell balancing for lithium-ion batteries), and mechanical safety (enclosure robustness, stability). The standard requires that UPS systems incorporating lithium batteries include BMS functions meeting defined performance requirements for cell protection and system-level isolation.
Relevance to Battery Engineering
For battery engineers supplying battery modules or packs for UPS integration, understanding IEC 62040-1 requirements is essential for designing to the safety interface the UPS manufacturer expects. The standard’s battery management requirements define what protective functions the battery system must include or expose to the UPS controller. For lithium-ion UPS batteries in particular, IEC 62040-1 requirements for BMS communication interfaces, protection function outputs, and thermal management directly affect the design of battery packs intended for the UPS market.
Disclaimer: This is not a definitive guide, just an indication and it is important that you always go back to the source for legislation.
See also: EN 62040-1 (European harmonised adoption of this standard), IEC 62477-1 (general power converter system safety), NFPA 111