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System 4

System 4 Low Voltage Switchboards

Technical Data
Electrical Data
Rated operational voltage Ue 440V
Rated insulation voltage Ue 690V
Rated frequency Ue 50Hz
Rated current horizontal bushbars 1250-4000A
Rated short time with stand current 50kA 3s

  • Type tested factory built assembly to BS EN 60439: Part 1
  • Environment protection IP312 to IP54 to BS EN 60529
  • Internal seperation Form 4 type 5 to BS EN 60439: Part 1
  • Front or rear access cabling versions
  • Compact construction, unrivalled stacking density


Packaged Substations

  • Indoor packaged substations comprise of a “SYSTEM 4” low voltage switchboard coupled to one or more dry type, air colled, cast resin transformers to IEC 60076/BS EN 60076 (formerly BS 171)
  • Ratings 500-2500kVA are available with enhanced ratings possible, by forced cooling with the addition of integral fans
  • The standard primary and secondary windings are 11kV and 433 Volt respectivelky, connected in Delta/Star, but other primary and secondary voltages are available
  • The packaged substation can be in various physical arrangements, to suit the requirements of individual installations


M-Pact Air Circuit Breakers

  • Incorperation of the M-Pact 2 withdrawable Air Circuit Breaker into System 4 switchboards offers state of the art circuit protection and system management together with reliability and performance with which the name M-PACT has always been associated.
  • 3 or 4 Pole configurations
  • ASTA, KEMA & LOVAG certified in accordance with IEC 947-2/BSEN60947



Depending on the selected type, the M-PRO protection relays offer the following features:

  • Earth fault protection
  • 12t Cropping
  • Neutral Protection
  • Thermal memory
  • Communication
  • Trip History and Indication
  • Manual or Automatic Reset
  • Watch dog in case of microprocessor malfunction
  • Plant Associated Memory Module
  • Outputs
  • Programmable Inputs
  • Load Monitoring
  • Overload Protection
  • Short Circuit Protection