A mains failure for as little as a millisecond will cause serious consequences and expensive outage costs in a wide range of applications. The HITZINGER Rotary Diesel UPS Systems, specifically designed for IT power, ensures business continuity and mitigates expensive outrage costs. At the heart of the DRUPS sits the Hitzinger alternator, benefitting from over 60-years of design providing you with one of the highest efficiency systems on the market. As specialists, we provide solutions, from design to installation and with our wealth of experience you can be assured of competitive and timely solutions.

The Hitzinger Dynamic Rotary Diesel UPS, uninterruptable power supply is the perfect solution for Data centres, airports and hospitals requiring IT Grade UPS. The Hitzinger DRUPS system comprises of four major components: diesel engine, generator, kinetic energy storage module and coupling choke. The kinetic energy module, generator and coupling choke work together to provide power conditioning and ride through energy for the UPS system, whilst the diesel engine provides the long-term back up for a mains failure. These systems provide extremely high availability and reliability in case of mains failure and high efficiency during stand-by operation.

Simplified Description - The kinetic energy storage module KIN consists of two rotating parts, the inner and the outer rotor. The outer rotor is equipped with a squirrel cage and rotates at 2600 rpm whilst running freely on the shaft of the inner rotor.

The inner rotor equipped with a specially designed winding rotating at synchronous speed (1500 rpm) coupled via a flexible coupling to the synchronous alternator. In the event of mains failure the magnetic field of the inner rotor brakes the outer rotor and keeps the speed of the synchronous alternator constant an via electronic control unit.

Maximum availability and reliability
The reliability of Hitzinger Rotary Diesel UPS systems is the result of product philosophy with the use of a minimum number of system components having an optimum quality standard.

Coupling Choke
Within a Diesel UPS system the coupling choke connects the input grid supply with the UPS high quality output supply. It allows large voltage differences between both AC systems by means of reactive currents in any direction, independent of the active power flow. The special design of the choke provides a high degree of de-coupling in both directions between the input and the output. The Coupling choke provides: Static and transient voltage decoupling of the input mains and the UPS bus -Harmonic filtering -Input load levelling irrespective of 100 % unbalanced output load and Input Power factor correction > 0.98 from 0 - 100 % load at nominal voltage.

In the event of input short circuit the current flow towards the grid network is limited by the choke to < 200 % I nominal until the input is disconnected. During this transient the current feed back to the mains is wholly reactive, ensuring all the kinetic stored energy can be fully utilised for the critical load.

Hitzinger Diagnostic and Monitoring System
Hitzinger offers a complete information software package for monitoring and control of the power supply systems through serial interfaces over a network, intranet or remote connectivity via modem links etc.

Technical data

Power classes

  • Power ratings from 150 kVA to 2,500 kVA
  • Voltages from 400 V to 11 kV
  • Frequencies from 50 Hz to 60 Hz


  • Stationary setup
  • Container version
  • Enclosed version


  • Ambient temperature: -30 °C to +50 °C
  • Noise level: up to 45 dB(A) at 3 m


  • ISO 3046
  • IEC 60034-1
  • ÖVE/ÖNORM 8001
  • ÖVE/ÖNORM 8002
  • ÖVE/ÖNORM 8007
  • IEC / EN 88528-11
  • TIA 942
  • Tier I - Tier IV of the Uptime Institute
  • CAT I, CAT II of the International Civil Aviation Organization (ICAO)
  • other standards (e.g. UIC, EN, IEC, ISO, UL) to requirements

Technical highlights

  • Stabilisation and filtering to protect consumers from harmonic oscillations, voltage peaks, voltage drops and frequency faults.
  • Cutting edge engine technology ensures low-polluting emissions of our systems. As an option, our systems can also be designed for optimum fuel economy.
  • Hitzinger alternators generate voltages of up to 11 kV independently, which offers benefits such as low losses and greater reliability thanks to minimisation of components and absence of step-up transformers.
  • Preventive system protection for prolonged service life, system monitoring, coil temperature monitoring, vibration monitoring, ...
  • Downtimes/maintenance intervals reduced by automatic lubrication systems, special engine air cleaners and fuel filters that can be switched over during operation,...
  • As a general contractor, we are able to realise complete turnkey projects, including aspects such as engineering, execution planning, production with subsequent factory approval, delivery and local installation.
  • Efficiency-optimised version with up to 97 % for lowest running costs and lowest Total Cost of Ownership (TCO) with respect to system service life.
  • Redundant start-up. In the worst case scenario where the starter batteries fail or the starter is defective, a back-up solution brings the engine up to speed and the system continues to guarantee an uninterrupted supply to critical consumers.
  • “Black start”: In the absence of a grid voltage, the system can be put into operation by use of batteries or air starters – nothing should prevent the supply of power to your consumers.
  • EMC-tested, longlife modular controller, 15.4-inch touchpanel with intuitive user menu navigation.

Variants and options

  • Container version
  • Enclosed version
  • Air-start systems
  • Redundancy variants (system-/controller-redundant,..)
  • Comprehensive communications interfaces (Profibus, Profinet, Modbus,..)
  • Circuit breaker variants including 3-pole, 4-pole, plug-in technology,…
  • Manual bypass
  • Remote maintenance access to information on current system state via W-LAN
  • Touchpanel for displaying complete system
  • Comprehensive and specially tailored customer-specific factory approvals and training
  • Extended periods of warranty