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MNS R - Main distribution switchgear
System Guide
ABB SACE 1
MNS R
main low voltage
distribution switchgear
Index
General
Introduction .................................................................................................................................2
Technical data ............................................................................................................................. 3
Construction and functional characteristics
Switchgear frame ........................................................................................................................ 4
Earthing ...................................................................................................................................... 4
Circuit-breakers used .................................................................................................................. 5
Circuit-breaker compartment ...................................................................................................... 5
Instrument compartment ............................................................................................................. 6
Busbar compartment ..................................................................................................................7
Main busbars .............................................................................................................................. 7
Distribution busbars .................................................................................................................... 8
Cable compartment ....................................................................................................................9
Segregation forms ..................................................................................................................... 10
Construction forma type ............................................................................................................ 10
Typical units and cross-sections ................................................................................................12
Ventilation ................................................................................................................................. 13
Standardisation
Typical configurations ................................................................................................................ 14
Switchgear depth ......................................................................................................................16
Versions
Available versions ......................................................................................................................17
Arc-proof .................................................................................................................................. 17
Power Motor Control Center integrated solutions ...................................................................... 17
Intelligent switchgear .................................................................................................................20
Installation
Fixing the units to the floor ........................................................................................................22
Tests and certifications .........................................................................................................23
ABB PC30 23-11-2009, 8:121
2 ABB SACE
General
Introduction
The MNS R main low voltage distri-
bution switchgear with rear access
had been studied for installation in
large electrical plants, such as petro-
chemical plants, steel works, rolling
mills, power stations, oil rigs, ships,
etc.
The service conditions on these plants
are often extremely severe: the high
currents involved and the effective
short-circuit levels require high per-
formances switchgears. Furthermore,
must be guaranteed personnel safety,
service continuity, easy inspection,
maintenance, erection and installa-
tion. Easy extension applications as
well as compact overall dimensions
are a must. The Power Center MNS
R switchgear fully complies with all
these requirements. In addition to
that, due to a perfect integration with
all the latest generation of ABB appa-
ratus, it easily meets all market re-
quirements.
ABB PC30 23-11-2009, 8:122
ABB SACE 3
Technical data
Reference Standards ABB SACE L.V. MNS R switchgear
Standards conformed to CEI EN 60439-1, IEC 439-1
Test certification Test certificates ABB SACE, ACAE LOVAG and SINAL
Electrical Data Rated voltages Rated insulation voltage up to 1000 V AC 1500 V DC
Rated service voltage Ue up to 690 V AC 750 V DC
Rated frequency 50 - 60 Hz
Impulse withstand voltage 12 kV
Rated currents Main busbars:
Rated current up to 6300 A
Rated peak withstand current up to 220 kA
Rated short-time withstand current (1s) up to100 kA
Distribution busbars:
Rated current 630÷4000 A
Rated peak withstand current 220 kA
Rated short-time withstand current (1s) 100 kA
Arc-proof Values 100 kA, 0,3 s. at IEC 61641 (on request)
Mechanical Dimensions Height 2200 mm
characteristics
Widht 300, 400, 600, 800, 1000, 1200 mm
Depth 1025, 1200, 1400, 1600 mm
Module base (height) E = 25 mm DIN 43660
Surface protection Frame Al-Zn galvanisation
Internal divisions Galvanised sheet UNI EN 10130
Transversal section Electrolytic galvanisation UNI ISO 4520
Housing (doors and external curtain panels) Painting RAL 7035
Degrees of protection With door open IP20
IEC 529, EN 60529 Standards
With door closed IP30 standard, up to IP 54
Construction form 3a, 3b, 4b
Normal conditions Installation internal for service
Ambient temperature -5 °C; +40 °C
Relative humidity max. 50% at 40 °C
Max. altitude ) 2000 m
Extra options Paint External protection colour on request
Busbar system Main and branch busbars
sheathed busbars, treated busbars (Ag/Sn)
Forms of segregation According BS 60439-1 4b type 1÷7
ABB PC30 23-11-2009, 8:123
415 V
4 ABB SACE
Construction and functional characteristics
Switchgear frame
The MNS R frame is based on
modular 2 mm thick still C sec-
tions, pre-drilled at a pitch of 25
mm. Each unit is based on
modular elements and consists
of:
– circuit-breaker compartments
– instruments compartments
– busbar compartment
– cable compartment.
All compartments are meccani-
cally segregated from the others.
The switchgear is pre set for
easy extensions on both sides.
Earthing
The switchgear is provided with a
continuous electrolytic copper earth-
ing busbar, with a cross-section suit-
able for the proper switchgear short-
circuit rating and pre-set on both
sides for connection to the earthing
network.
Are connected to the earthing busbar
- all the metallic structures of the indi-
vidual units;
- all not live metallic parts of the cir-
cuit-breakers;
- all CTs and VTs secondary earthing
connections.
All others not live metallic parts of the
apparatus are connected to the earth-
ing busbar by means of the unit me-
tallic structure.
The doors with apparatus installed are
connected to the structure by means
of flexible copper braids. All the
ground connections are made with
screws or bolts provided with gripping
washers.
ABB PC30 23-11-2009, 8:134
ABB SACE 5
Circuit-breaker compartment
The compartment is suitable to accept both air and
moulded-case circuit-breakers and it is accessible from the
front side by means of a locked hinged door. The circuit-
breakers can be installed in all the available versions, fixed,
plug-in and withdrawable. With all the widrawable circuit-
breakers, in order do guarantee the maximum safety level
to the operator, the apparatus handling can be carried out
with the door closed.
Circuit-breaker compartment with EmaxCircuit-breaker compartment with Isomax
Circuit-breakers used
System Pro M modular circuit-breakers (MCBs)
SACE Emax air circuit-breakers (ACBs)
SACE Isomax S moulded-case circuit-breakers (MCCBs)
Tmax moulded-case circuit-breakers (MCCBs)
ABB PC30 23-11-2009, 8:135
6 ABB SACE
Construction and functional characteristics
Instrument compartment
The instrument compartment as well
is located in the front side of the
switchgear and it is accessible by
means of a locked hinged door. It can
be dedicated to each functional unit
or be common to several ones. The
measuring instruments, protection re-
lays, control and signalling devices are
normally mounted on the door,
whereas any other auxiliary appara-
tus, such as miniature circuit-break-
ers, protection fuses and auxiliary re-
lays are placed inside the compart-
ment. Apparatus wiring is made with
flexible copper cables and arranged
in dedicated wiring channels. Each
circuit-breaker terminal blocks are
separated from the others and prop-
erly identified.
Internal compartment with auxiliary apparatus and terminal boxes
Instrument compartment with protection relay mounted on the door
ABB PC30 23-11-2009, 8:136
ABB SACE 7
Busbar compartment
The busbar compartment is located
in the middle section of the
switchgear. Main busbars can be lo-
cated at the top, in the centre or at
the bottom of the panel depending on
the selected design and they distrib-
ute the power to the various
switchgear panels. In some of the ex-
isting configurations main busbars
can be directly connected to a circuit-
breaker as well. Distribution busbars
are located into the single column and
positioned vertically to feed panel cir-
cuit-breakers. The busbar system can
be composed by 1, 2 or 3 busbars
per phase, according to requested
rated current, short-circuit level and
operational ambient conditions in
terms of temperature, altitude and
humidity. Busbars are normally bare
copper made, on request can be suit-
ably treated with tinning, silver-plating
and/or sheathing.
Main busbar system with connections for incoming busbars and bus-tie from the top
Main busbars
MNS R main busbars are available for
currents up to 6300 A. Main busbars,
as well as distribution busbars, can be
completely segregated. Each MNS R
panel can be fitted with three busbar
systems at the same time (top-cen-
tre-bottom) each segregated from the
others.
Detail of a compartment with entry from the top and connection on the main busbar system
ABB PC30 23-11-2009, 8:137
8 ABB SACE
Construction and functional characteristics
Distribution busbars
MNS R distribution busbars are avail-
able for currents up to 4000 A. Distri-
bution busbars, branched directly
from main busbars, are vertically in-
stalled either on the right or on the left
in the column. They are feeding out-
going circuit-breakers, and are con-
nected to them by means of rigid or
flexible copper busbars, or cables. In
any case, all the connections are suit-
ably sized to withstand the thermody-
namic stresses of the fault currents.
Busbar distribution system with connections to the outgoing circuit-breakers made with copper
busbars and cables.
Cable
connections
Copper busbar
connections
ABB PC30 23-11-2009, 8:138
ABB SACE 9
Cable compartment
The cable compartment is located in
the rear side of the panel and and it is
accessible by means of a locked
hinged door or a removable bolted
door.
Its purpose is to contain:
– power terminals
– outgoing cables
– current reducers
– auxiliary terminal boxes (if any).
Removable
sheets
for cable
entry
Distribution
busbars
Connection
terminals
ABB PC30 23-11-2009, 8:139
10 ABB SACE
Construction and functional characteristics
Segregation forms
The MNS R segregation forms are
compliant with the relevant standard
IEC 60439-1 annex D. The purpose
of the segregations is mainly to allow
safety access to the internal parts of
the switchgear to operational person-
nel and to minimize propagation of
any faults it may happen in the circuits
and in the adjacent compartments, to
the benefit of service continuity of the
installation.
Form 4b, rear side.
Both main and distribution busbars are metallically segregated, plastic covers are used for cable
connections.
Form 1 No segregation
Form 2a Segregation of the busbars from the functional units; terminals are not separated from the busbars
Form 2b Segregations of the busbars from the functional units; the terminals are separated from the busbars
Form 3a Segregations of the busbars from functional units and between functional units; segregation of the terminals
from the functional units, but not from the busbars; terminals not separated from each other
Form 3b Segregations of the busbars from the functional units and between functional units; segregation of the
terminals from the functional units and from the busbars, but not from each other
Form 4a Segregations of the busbars from the functional units and between functional units; segregation of the
terminals from the functional units and from the busbars; the terminals for external conductors are in the same
compartment as the associated functional unit
Form 4b Segregations of the busbars from the functional units and between functional units; segregation of the
terminals from the functional units and from the busbars; the terminals for external conductors are not in the
same compartment as the associated functional unit
Form 4b, rear side Both main and distribution busbars are metallically segregated, plastic covers are used for cable connections.
Construction forms type
ABB PC30 23-11-2009, 8:1410
ABB SACE 11
Form 3a
Construction solution of one unit with moulded-case
circuit-breaker in form 3a
View from the top of a column with moulded-case
segregated circuit-breaker in form 3a
Form 3b
Construction solution of one unit with moulded-case
circuit-breaker in form 3b
View from the top of a column with moulded-case
segregated circuit-breaker in form 3b
Form 4b
Construction solution of one unit moulded-case
circuit-breaker in form 4b
View from the top of a column with moulded-case
segregated circuit-breaker in form 4b
MNS R form 3a, 3b and 4b construction solutions
ABB PC30 23-11-2009, 8:1411
12 ABB SACE
Construction and functional characteristics
Typical units and cross-sections
The ABB MNS R switchgear is de-
signed for the installation of ABB
Emax air circuit-breakers as well as
ABB Tmax and Isomax moulded-
case circuit-breakers, in all the avail-
able versions, fixed, plug-in and with-
drawable. It allows installation of the
main ABB apparatus and of the
measuring and protection instruments
available on the market, according to
different design requirements.
Construction solutions with ABB
Emax air circuit-breakers and ABB
Isomax and Tmax moulded-case cir-
cuit-breakers
Emax air circuit-breakers panels are
available with both top and bottom
entry design.
For modules sizing, please refer to ta-
bles at page 15.
Tmax and Isomax moulded-case cir-
cuit-breakers are installed horizontally
and vertically as well in the unit.
For modules sizing, please refer to ta-
bles at page 14.
The bus-duct can easily be connected to the busbar
system of the circuit-breakers in the switchgear.
Typical realisation of a structure with Emax circuit-breaker
connected in the top part to a bus-duct.
Typical section with two superimpo-
sed Emax air circuit-breakers. The
circuit-breaker placed in the bottom
is an incoming/outgoing feeder
that can be provide with cable as
well as bus-duct connection.
The circuit-breaker placed on top
of the feeder is a bus-tie and
it connects the two main
busbar systems
The switchgear allows the installation of bus ducts with various current carrying capacities
ABB PC30 23-11-2009, 8:1412
ABB SACE 13
A
B
C
Ventilation
The ABB MNS R switchgear have
been studied to create separated air
flows for all the internal compartments
in order to guarantee an efficient natu-
ral ventilation to all the installed com-
ponents. Ventilation grides for natural
cooling are placed on the front and
rear side of the the panel on both, top
and bottom positions, and on the roof
as well.
A= Apparatus area
B= Busbar area
C= Cable area
Diagram of natural ventilation of the unit
ABB PC30 23-11-2009, 8:1413
14 ABB SACE
B1 B4
A1 A4
Standardisation
Typical configurations
The ABB MNS R switchgear has great
application flexibility. Several assembly
configurations are possible, for incom-
ing, outgoing and bus-ties.
Some examples are given below:
Typical Incoming/Outgoing solutions
Typical Incoming/Outgoing solutions
for 5000/6300 A main busbar system
Typical Incoming/Outgoing solutions
for main busbar system up to
4000 A
Depth: 1200-1400-1600
PC 3.0 PC 3.0 PC 3.0
MORSETTIERE MORSETTIERE MORSETTIERE
SACE
SACE
Depth: 1200-1400-1600
PC 3.0
MORSETTIERE
PC 3.0
MORSETTIERE
PC 3.0
MORSETTIERE
SACE
Depth: 1400-1600
PC 3.0
MORSETTIERE
SACE
MORSETTIERE
PC 3.0
SACE
PC 3.0 PC 3.0
MORSETTIERE
PC 3.0
Depth: 1400-1600
PC 3.0
MORSETTIERE
SACE
MORSETTIERE
PC 3.0 PC 3.0 PC 3.0
MORSETTIERE
PC 3.0
ABB PC30 23-11-2009, 8:1414
ABB SACE 15
C1 C4
D1 D4
Typical Incoming and Bus-tie
solutions
Typical Incoming and Bus-tie solu-
tions for main busbar system from
5000 to 6300 A
Typical Incoming and Bus-tie solu-
tions for main busbar system
up to 4000 A
For customised solutions, please contact ABB SACE S.p.A. directly
Depth: 1200-1400-1600
PC 3.0 PC 3.0PC 3.0
SACE
SACE
SACE
PC 3.0
SACE
PC 3.0
SACE
PC 3.0
Depth: 1200-1400-1600
PC 3.0
SACE
MORSETTIERE MORSETTIERE MORSETTIERE MORSETTIERE MORSETTIERE MORSETTIERE
Depth: 1400-1600
PC 3.0PC 3.0
SACE
PC 3.0
SACE
SACE
PC 3.0 PC 3.0
Depth: 1400-1600
PC 3.0 PC 3.0 PC 3.0PC 3.0
SACE
SACE
SACE
MORSETTIERE MORSETTIERE MORSETTIERE MORSETTIERE MORSETTIERE MORSETTIERE
ABB PC30 23-11-2009, 8:1415
16 ABB SACE
PABC
1025 450 525 50
1200 450
400 350
525 225
1400 450
525 425
650 300
1600 450
525 625
650 500
FRONT
Switchgear depth
The switchgear can have different
depths. Selection mainly depends on
the rated current of the main busbar
system, on the short-time withstand
current and on the space needed for
feeder connections.
Depth
Standardisation
Switchgear depth in relation to the main busbars rated current
Amperes Depth
Max. 50 kA 400 1200
630 1200
800 1200
1000 1200
1250 1200
1600 1200
2000 1200
2500 1200
Max. 75 kA 400 1025-1200
630 1025-1200
800 1025-1200
1000 1025-1200
1250 1025-1200
1600 1025-1200-1400
2000 1025-1200-1400
2500 1025-1200-1400
3200 1025-1200-1400-1600
Max. 100 kA 3200 1400-1600
4000 1400-1600
5000 1400-1600
6300 1400-1600
ABB PC30 23-11-2009, 8:1416
ABB SACE 17
Available versions
The ABB MNS R switchgear is avail-
able in the following versions/types:
- For indoor installation
- Top and bottom entry power cables
- Top and bottom entry bus-duct
- Top and bottom entry auxiliary cables
- Standard painting
- Special painting cycle for aggressive
environments
- Bare busbars
- Sheathed busbars
- Busbars with protective electrolytic
treatment
- Flame-proof cables and wiring
- Flame-proof and alogen free cables
and wiring
- Arc-proof
- Degree of protection IP30…54
- IEC segregation forms 3a, 3b and 4b.
Versions
Arc-proof
On request, in order to achieve the
maximum safety level, is available a
version tested in conformity with the
technical report IEC 61641. The arc
proof ABB MNS R switchgear can
withstand the stresses caused by any
internal arcs for short-circuit
currents up to 100 kA for 300 ms at
at 415 V unaltered.
Version according to UL Standards
ABB MAX SG is the solution available
in accordance with the American
Standards UL 1558. Please refer to the
relevant technical documentation for
details.
ABB PC30 23-11-2009, 8:1417
415 V, still keeping the voltage value
18 ABB SACE
Versions
Power Motor Control Center integrated solutions
By means of a busbar transition panel, it is possible to
make Power Motor Control Centers to supply widrawable
motor control feeder units.
ABB PC30 23-11-2009, 8:1518
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