The Rotabloc UPS delivers high reliability and efficiency – ensuring complete protection of critical electrical loads, and low cost of ownership.

IEM Power Systems has developed the complete UPS system to protect Critical / ‘No-Break Loads’ against electrical disturbances in the event of power failures, voltage transients, or slow voltage fluctuations.

The simple, robust design allows for low maintenance while guarantees maximum reliability.

The unique systems based approach also means that IEM Power Systems is the only UPS manufacturer that will build, integrate and test your system in the factory as standard.

IEMPS Rotabloc energy storage systems provide sufficient ride-through to ensure that your critical loads are always fully protected. Other flywheel systems have been developed, but none has managed to provide the same simplicity, reliability and efficiency delivered by the Rotabloc system. The result is a DRUPS with the highest reliability and most favorable TCO for your project.


  • Efficiently protects the critical No-Break and Short-Break loads
  • Generator can be operated and maintained independent of the Rotabloc UPS, supporting continuous running
  • Lowest maintenance requirements for any UPS solution
  • Flexible configurations for all applications up to 50MW+ in low and medium voltages and isolated parallel systems
  • Very low TCO, minimal maintenance costs, high efficiency with no a/c requirement


  • Standard Alternator with no special windings and easy to adapt to your requirements
  • Low Speed Bearings with AutoLube extend system lifetime and reduce maintenance
  • Electromagnetic Coupling for no maintenance, frictionless energy transfer
  • Simple design using standard electrical and mechanical components lowers cost and increases reliability
  • Patented drive motor maintains the optional speed, automatically matching the needs of the No-Break load to the energy stored by the UPS system
  • Green technology – extremely recyclable, no a/c and very high operating efficiency – supports your facility’s green credentials

Official Partners

  • Rotabloc UPS 400 - 2000kVA (320 – 1600kW)
  • Rotabloc Integrated DRUPS System
  • 11kV & 400V Applications
  • Unrivaled low Total Cost of Ownership
  • Continuous Power Supply
  • Complete Power Conditioning
  • Electromagnetic Coupling For No Maintenance
  • Unity Power Factor, No PFC required
  • Remote Monitoring
  • 24 Hour Maintenance & Support