ABB MBS331 is a 3PW CombiLine horizontal 3-pole busbar module expansion rated up to 850 A with 100 mm busbar spacing and a ZX520 busbar holder for compatible ABB sub-distribution assemblies.
Why Choose the ABB MBS331 Busbar Module Expansion 3PW?
The ABB MBS331 is a modular busbar module expansion designed for ABB CombiLine sub-distribution assemblies. Supplied under ABB order code 2CPX041745R9999, this unassembled interior fitting kit provides a dedicated horizontal busbar section for professional low-voltage distribution-panel construction and is part of ABB’s DESUJ Sub Distribution product group.
Designed in a 3PW / three-field-width format, the MBS331 measures 750 mm wide and 450 mm high, providing 108 space units. It is configured for a 3-pole horizontal busbar system with a 100 mm busbar centre distance and uses the ABB ZX520 busbar holder.
The MBS331 supports up to three copper busbars and is designed for a maximum rated current of 850 A. The copper busbars themselves are ordered separately, allowing the module to be configured for the required distribution arrangement, while installation is intended for compatible cabinets from 275 mm depth.
Key Advantages
Purpose-designed horizontal busbar module for ABB CombiLine systems.
3PW / 750 mm field width provides substantial busbar distribution space.
Maximum rated current of 850 A for high-current distribution applications.
3-pole configuration supporting up to three copper busbars.
100 mm busbar centre spacing for structured system construction.
Integrated ZX520 busbar holder supports coordinated ABB system assembly.
Key Features
ABB MBS331 busbar module expansion.
3PW / three-field-width configuration.
3 RE / 450 mm module height.
750 mm module width.
108 space units.
3-pole horizontal busbar system.
850 A maximum rated current.
100 mm busbar centre distance.
Designed for a maximum of three copper busbars.
Supplied with ZX520 busbar holder.
Closed plastic covers with 90-degree press-and-turn closures.
RAL 7035 cover finish.
High-Current Busbar Distribution for Electrical Assemblies
Busbar modules provide a structured method of distributing electrical power through low-voltage switchboards and distribution assemblies. The ABB MBS331 creates a dedicated horizontal busbar section capable of supporting up to three copper rails, providing a coordinated platform for high-current distribution within compatible CombiLine installations.
With its 850 A maximum rated current, 100 mm busbar spacing and ZX520 busbar holder, the MBS331 is designed for professional panel construction where robust power distribution and modular system integration are required. Continuous busbars can also be used to combine different module widths within compatible cabinet configurations.
Typical Applications
ABB CombiLine sub-distribution assemblies.
Low-voltage electrical distribution boards.
Horizontal 3-pole busbar distribution systems.
Commercial and industrial switchboards.
High-current electrical distribution panels.
Panel-building and modular switchgear projects.
Technical Specifications
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Busbar Centre Distance (mm)
100 mm
Device Type
Busbar
Product Series
ABB CombiLine
Series
CombiLine
Product type
Busbar module expansion
Expansion width
3PW
Raster units
3 RE
Space units
108
Module height
450 mm
Module width
750 mm
Busbar system
Horizontal
Number of poles
3
Maximum rated current
850 A
Busbar centre distance
100 mm
Maximum number of copper busbars
3
Busbar holder
ZX520
Compatible copper busbar size
40 × 10 mm
Copper busbars
Ordered separately
Cover material
Plastic
Cover design
Closed
Closure
90-degree press-and-turn closure
Colour
RAL 7035
Minimum cabinet depth
275 mm
Compatible mounting frame
WR
Mounting frame
Ordered separately
Supply format
Kit, unassembled
ABB order code
2CPX041745R9999
EAN
4011617417453
Product group
DESUJ Sub Distribution
Frequently Asked Questions
What is the ABB MBS331 used for?
The ABB MBS331 is a busbar module expansion designed to provide a horizontal 3-pole busbar section within compatible ABB CombiLine sub-distribution assemblies.
What is the maximum rated current of the ABB MBS331?
The MBS331 is designed for a maximum rated current of 850 A.
What size is the MBS331 busbar module?
The MBS331 is a 3PW / three-field-width module measuring 750 mm wide × 450 mm high and providing 108 space units.
What busbar spacing does the MBS331 use?
The MBS331 uses a 100 mm busbar centre distance and is designed for a horizontal 3-pole busbar arrangement.
Are the copper busbars included with the MBS331?
No. The MBS331 provides the busbar module and ZX520 busbar holder, while the required copper busbars must be ordered separately.
What cabinet depth is required for the ABB MBS331?
The MBS331 is designed for compatible cabinets from a minimum depth of 275 mm.
What is the ABB order code for the MBS331?
The ABB order code for the MBS331 busbar module expansion is 2CPX041745R9999.
Trusted by Panel Builders and Electrical Professionals
ABB CombiLine busbar modules provide panel builders, contractors and electrical engineers with coordinated high-current distribution solutions for professional low-voltage assemblies, supporting structured, dependable and serviceable switchboard construction.
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