MNS DTR / MNS Service
Type-tested switchgear assemblies (TTA)*
Low-voltage switchgear and control gear assem-
blies **
Power switchgear and control gear assemblies **
IEC 61439 -1 and -2
EN 61439-1 and -2
Germanischer Lloyd, Hamburg / Germany
ASTA, UK
IPH, Institut für Prüffeld- und Hochspannungstechnik, Berlin / Germany
DLR German Research Institute for Aerospace e. V., Jülich / Germany
IABG Industrieanlagen Betriebsgesellschaft, München / Germany
Rated insulation voltage U
i
Rated operating voltage U
e
Rated impulse withstand voltage U
imp
Overvoltage category
Degree of pollution
Rated frequency
690 V 3~, 750 V-
6 / 8 / 12 kV, depending on equipment
II / III / IV
3
up to 60 Hz
Rated current I
e
Rated peak withstand current I
pk
Rated short-time withstand current I
cw
Distribution bars:
Rated current I
e
Rated peak withstand current I
pk
Rated short-time withstand current I
cw
up to 6300 A
up to 250 kA
up to 100 kA
up to 2000 A
up to 176 kA
up to 80 kA
Recommended height
Recommended width
Recommended depth
Basic grid size
2200 mm
400, 600, 800, 1000, 1200 mm
400, 600, 800, 1000, 1200 mm
E = 25 mm acc. to DIN 43660
Internal subdivision
Enclosure
Zinc or Alu-zinc coated
Zinc or Alu-zinc coated and
Powder coated RAL 7035, light grey
Halogen-free, self-extinguishing,
flame retardant, CFC-free
IEC 60707, DIN VDE 0304 part 3
Device compartment - device compartment
Busbar compartment - cable compartment
Busbar compartment - device compartment
Device compartment - cable compartment
Special colours (standard RAL 7035)
Insulated
Silver or tin galvanized
* Definition TTA: Switchgear assembly corresponding, to a large degree, with the original type or system of switchgear assembly type-tested
in accordance with these standards.
** Design verification by testing: When an assembly has previously been tested in accordance with IEC 60439-1 , and the results fulfil the
requirements of IEC61439 -1 / -2, the verification of these requirements need not to be repeated
*** Depending on the electrical equipment.