Main Distribution Board (MDB)

A switchboard is a large single panel, frame, or assembly of panels on which are accessed from front, rear or both sides. They are generally installed immediately after the power source (transformers or generators).

MDB is designed and tested as per the new IEC standard 61439-1,2. This panel is available up to 6300A, 100kA/ 1 sec, Form 4b.

Low Voltage Switchboards are mainly used for electrical power distribution

and control.

  • RAL7035 color is standard, other colors can be provided upon
  • Neutral and earth busbars can be rated up to 100% of the main
  • Optimized solution with compact design provides 6300A in 800mm depth
Technical Data


Enclosure Name                                                             FGECO




Electrical Data


Rated voltage

Rated operating voltage Ue Up to 690 V
Rated insulation voltage Ui Up to 1000 V
Rated impulse withstand voltage Uimp Up to 12 kV
Overvoltage category Up to IV
Material group IIIa
Degree of pollution 3
Rated frequency 50/60 Hz

Rated current


Busbar type

Pure copper bars, with 99.9%conductivity
Rated current for main distribution busbar In Up to 6100 A
Conditional short circuit current Icc Up to 100 kA @ 0.2PF
Rated short-time withstand current Icw Up to 100 kA @ 1 Sec
Rated short-time withstand current Icw Up to 65 kA @ 3 Sec
Rated peak withstand current Ipk Up to 220 kA

Incoming and outgoing

Incoming feeders Up to 6300 A
Distribution feeders Up to 6300 A
Arc fault Prospective short-circuit current Up to 100 kA @ 300 ms

Direct contact protection

Form of separation Up to 4b
Protection against electric shock Yes
Seismic withstand capability test and induced vibrations Yes
Ventilation Forced / Normal


Mechanical Characteristics

Skid base height Up to 300 mm
Number of useful modules (1 module = 50mm) 43 M

Degree of protection

External mechanical impacts strength IK Up to IK10
External degree of protection IP Up to IP55

Steel components

Frame thickness Up to 3 mm

Sheet metal material

AluZinc steel Electrogalvanized /Stainless Steel

Surface protection

Electrostatic powder coating/ Epoxy
Standard colors RAL7035*
Panel mounting Free standing only



Installation environment

Ambient temperature (°C) 40*
Relative humidity max 50% at 40°C
Maximum altitude Up to 2000m*


Busbar system 3 PH, Neutral and PE
Busbar insulating material PVC sleeving
Busbar plating material Bare / tin / silver