The best modular UPS systems are designed to increase the reliability and availability of the overall system with minimum downtime thanks to their hot-swappable parts and cost-effective redundancy, the complete independence of each module and the prevention of fault propagation if one of the modules fails.

The aim of this guide is to help users understand failure rate and MTBF concepts for monolithic and modular UPS systems, clarifying the different MTBF definitions:

  • Failure definitions for a monolithic UPS system,
  • Modular UPS structures,
  • Failure definition for modular UPS systems,
  • Definition of a power module failure in modular UPS systems,
  • Similarities between power modules and monolithic UPS systems,
  • Typical failure rates of a modular UPS system.