SIFU Series

SIFU (Smart Integrated Functional Unit) integrates multi-functional components in a DC high voltage system that provides a ready-to-use solution. The components are typically mounted in a metal enclosure suitable for both outdoor and indoor use.

The modular design allows to configure the box dimensions and function integration to get an optimized solution.

  • Mechanical and electrical integration
  • Integration of control and diagnostic system
  • Nominal voltage up to 3kVdc
  • Water and dust protection up to IP66
  • Flexibility and modularity
  • Compact solution
  • Easy maintenance
  • Harsh environment conditions protection
  • Standard platform based on aluminum or stainless-steel metal box
  • Wide range of our own components
  • Smart integration with advanced control & diagnostic system
  • Reduced ownership cost
  • CBM function ready
  • Walkable and/or tilting cover
  • Locking key
  • Overpressure exhaust system: with valve, labyrinth or integrated in the cover
  • Fire detection and extinguishing system
  • Fixation points
  • Remote lever with control shaft for earthing switch control
  • Intermediate assembly bracket
Data Value

Nominal Operational Voltage [Vdc] 750 / 1500 / 3000
Rated Operational Voltage Ur [Vdc] 1800 / 3600
Conventional free air thermal current Ith (at +40°C RT) [A] Up to 3200 / 1600
Maximum breaking capacity (peak-steady state) [kA] 100-70
Input External Cable Connections Up to 6
Output External Cable Connections Up to 14
Type of Cable interface Single cable glands or bushing or modular cable glands
Nominal Voltage Un [Vdc] 25 to 110
Voltage Range 0.7 – 1.25 Un
Connector type Harting Han HPR
Installation Outdoor, roof assembly
Protection index up to IP67
Shock and Vibrations (IEC61373) Cat. 1 - Class A
Indoor installation Metal switchgear in cabin
Outdoor installation Metal enclosure on roof or underframe
Overvoltage protection Option
Line Current Measurement M / T
Line Voltage Measurement M / T
Energy calculation M
Harmonics detection M
Overcurrent detection M
Main line protection M (Single or multi voltage HSCB)
Pre-charge current limitation M
Pre-charge control M
Roof line disconnection M
Ground connection M
Converter line control M
SMART functionality (diagnostic, autotest, etc.) Option
Fire detection & extinguish Option

M = Made by Microelettrica
T = Third parties