Protect Plus M400

Modular UPS

10 – 40 kVA
1/1, 3/1 or 3/3 phase

up to 4 UPS in parallel operations

Protect Plus M400 is a modular on-line (VFI-SS-111) UPS system with a high operating AC/AC efficiency and compact footprint. The Protect Plus M400 UPS system is designed to protect critical data and IT infrastructures with the ultimate on-line power protection. The Protect Plus M400 is based on a 2U high 10kVA/kW power module that can be housed in one of two frame sizes (20 kVA or 40 kVA) providing up to 40 kVA maximum capacity or 30 kVA N+1 configurations. Up to 4 frames can be operated in parallel for additional resilience or capacity. The operating efficiency in on-line mode is up to 95% and 98% in Eco Mode. The UPS delivers up to unity-power factor and the system can be configured for 1/1, 3/1 or 3/3 input/output connections at installation. The standard Frame Plus provides space for a 20 kVA or 40 kVA frame and internal battery shelves. Longer runtimes can be achieved using external battery cabinets.



  • Double Conversion(VFI-SS-111)
  • Modular design with N+X built-in redundancy
  • Transformer-less architecture
  • Power capability up to 40 kVA
  • 10 kVA power modules (2U height each) with independent LED status indications
  • Hot-swappable modules
  • ECO Mode up to 98% efficiency
  • Idle Mode, to increase operating efficiency, even with low load
  • Output PF up to 1
  • Frequency converter mode
  • 7″ color Touch Screen graphic display
  • Built-in ‘Intelligent Test Mode’
  • Centralized (static and manual) Bypass Module
  • Centralized (external) battery connection
  • Parallel capability up to 4 units



Protect Plus M400 combines a high operating efficiency value, with a compact footprint and modular architecture. The 20 and 40 kVA frames can be used as stand-alone units (on casters) or installed inside a 19″ rack cabinet or in a Frame Plus UPS and battery cabinet.

The Protect Plus M400 UPS is designed to meet the power protection requirements of server racks, small-to-medium sized data centers, transportation, retail and other critical applications where power reliability, a compact footprint and operating efficiency are key factors.

The UPS is based around a 10 kVA power module and can be scaled up to 40 kVA capacity or 30 kVA N+1. The modules are hot-swappable and up to four frames can be operated in parallel to achieve a total power capacity of 160 kVA.

The 10 kVA power module uses the latest IGBT double conversion technology and has a low input THDi and almost unity input power factor (input PF > 0.99 and input THDi < 3%) even when a low percentage of load is applied. These features help the UPS to achieve a high operating efficiency, low total cost of ownership and a compact footprint. For long runtimes, the UPS can be installed with an optional 10 A battery charger to ensure a fast recharge time.



Minimized costs and optimal protection:

Protect Plus M400 is designed to maximize savings in terms of footprint (m2), power installed (kVA), electrical system (cabling and protection devices), security (MTTR and MTBF) and most importantly, power management (kW and cost). The scalable architecture reduces CAPEX and optimizes OPEX costs.

The installed capacity can easily be increased or decreased depending upon the connected load. Each power module has independent hardware and controllability, able to operate and coordinate with other modules within the system. The control of power modules connected in parallel is decentralized in the single 10 kVA device, increasing operational safety. The omission of the master/slave architecture eliminates any possibility of a problem due to the failure of a single power module.

The common frames are available in two di erent dimensions, able to house up to 2 or 4 power modules (including redundancy). The frames allow for input/output connections to the input electrical system (both with common or separated lines for rectifier and bypass inputs) and to the protected load, with centralized static and manual bypass lines. Both frame models can be connected in parallel up to 4 units.

Easy installation, operation and maintenance:

The Protect Plus M400 can be configured as a 1/1, 3/1 or 3/3 phase system upon installation. The 7″ LCD touch-screen built into the frame’s front panel provides access to a range of operating information for the entire UPS system as well as each individual power module including, historical logs, alarms, operating parameters, load and electrical system measurements.
The power modules can also be accessed from the front of the frame for easy removal and inspection.
The Mean Time To Repair (MTTR) is significantly low thanks to the hot swappable architecture. The models are held in place by four screws and slide into/out of their position in the UPS frame. Bottom and top cable entry are available for the frames.

Intelligent Test Mode:

An AEG PS Service Engineer can set the Intelligent Test Mode, for full load test, without the need of a dummy load or wasting energy: the current that flows through the UPS can be equal to the current to the load connected.

  • Energy-saving of more than 90 % (only consumption of the UPS itself)
  • Load free, an AEG Service Engineer can test the UPS system with di erent current rates without load connected
  • Simple wiring, convenient for on site demonstrations and easy for factory and site testing




User interface and accessories:
  • User-friendly interface
  • Monitoring, managing and shutdown software
  • RS232 serial port
  • USB port
  • EPO push button (on the front) and contact (for remote control)
  • Modbus port available as standard
  • SNMP card (optional)
  • Larger Remote Panel (optional)
  • Optional additional battery charger module (up to 15 A), that extends the nominal charging current (3,5 A per power module)