ABB MS331 is a 3 PW CombiLine horizontal three-pole busbar module rated up to 850 A with a 750 mm field width, 100 mm busbar spacing and ZX520 holders for high-current low-voltage distribution assemblies.
Why Choose the ABB MS331 Busbar Module Expansion 3PW?
The ABB MS331 is a factory-assembled CombiLine busbar module designed for horizontal power distribution within compatible ABB low-voltage distribution cabinets. Supplied under ABB order code 2CPX041280R9999, it provides a structured internal platform for a high-current three-pole copper busbar system with a maximum rated current of 850 A.
The MS331 is configured for 3 panel widths (3 PW), with a field width of 750 mm and a module height of 450 mm. Its 3 RE format provides 108 space units, giving panel builders a wide busbar field for substantial power-distribution sections in commercial and industrial low-voltage assemblies.
The module is designed for a 3-pole horizontal busbar system with a 100 mm centre-to-centre spacing and ABB ZX520 busbar holders. It accommodates up to three copper busbars, which are ordered separately. Closed plastic covers finished in RAL 7035 and secured with 90-degree press-and-turn closures complete the assembly, which is suitable for compatible cabinets from 275 mm depth.
Key Advantages
High-current horizontal busbar module rated up to 850 A.
3 PW configuration provides a wide 750 mm distribution field.
Designed for a 3-pole copper busbar system.
100 mm busbar centre spacing provides a defined installation geometry.
Uses ABB ZX520 busbar holders for coordinated system construction.
Accommodates up to three copper busbars.
108 space units provide substantial internal distribution capacity.
Factory-mounted configuration simplifies integration into compatible ABB distribution cabinets.
Key Features
ABB CombiLine internal mounting system.
3 panel widths (3 PW).
3 raster units (3 RE).
450 mm module height.
750 mm field width.
108 space units.
850 A maximum rated current.
Horizontal busbar orientation.
Designed for a 3-pole busbar system.
100 mm busbar centre distance.
ABB ZX520 busbar holders.
Suitable for a maximum of three copper busbars.
Copper busbars ordered separately.
Closed plastic covers finished in RAL 7035.
90-degree press-and-turn cover closure.
Reliable High-Current Busbar Distribution
Busbar modules provide a structured method of distributing substantial electrical currents throughout low-voltage switchgear and distribution assemblies. The ABB MS331 combines an 850 A maximum rated current with a wide 3 PW format, horizontal three-pole arrangement and 100 mm busbar spacing, providing a coordinated platform for high-current power distribution within the CombiLine system.
The module is supplied mounted and installed in the cabinet but without the copper busbars, allowing the required conductors to be selected separately for the finished assembly. ABB ZX520 holders maintain the defined busbar arrangement, while the 750 mm field width provides substantial space for constructing larger commercial and industrial power-distribution sections.
Typical Applications
Low-voltage power distribution boards.
ABB CombiLine distribution assemblies.
High-current busbar distribution sections.
Commercial building electrical distribution systems.
Industrial low-voltage switchgear.
Main and sub-distribution cabinet assemblies.
Panel-building applications requiring horizontal three-pole busbars up to 850 A.
Technical Specifications
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Busbar Centre Distance (mm)
100 mm
Product Series
ABB CombiLine
Device Type
Busbar
Series
CombiLine
ABB order code
2CPX041280R9999
Product type
Busbar module expansion
Panel width
3 PW
Raster units
3 RE
Module height
450 mm
Field width
750 mm
Space units
108
Rated current
Up to 850 A
Busbar system
3-pole
Busbar orientation
Horizontal
Busbar centre distance
100 mm
Busbar holder
ABB ZX520
Maximum number of copper busbars
3
Copper busbars
Ordered separately
Minimum applicable cabinet depth
275 mm
Cover material
Plastic
Cover design
Closed
Cover colour
RAL 7035
Cover closure
90-degree press-and-turn
Installation
Mounted and installed in cabinet
Mounting-frame system
WR
Fire-protection housing suitability
Not suitable
Product group
DESUJ Sub Distribution
Frequently Asked Questions
What is the ABB MS331 used for?
The ABB MS331 is a horizontal busbar module for creating a three-pole high-current distribution system within compatible ABB CombiLine low-voltage distribution cabinets.
What is the rated current of the ABB MS331?
The MS331 busbar module has a maximum rated current of 850 A.
What is the busbar spacing of the MS331?
The ABB MS331 uses a 100 mm centre-to-centre busbar spacing with ABB ZX520 busbar holders.
Are the copper busbars supplied with the MS331?
No. The MS331 accommodates up to three copper busbars, but the required copper busbars must be ordered separately.
What cabinet depth is required for the ABB MS331?
The MS331 is suitable for compatible distribution cabinets from 275 mm depth. The appropriate WR mounting frame must be ordered separately.
Trusted ABB Distribution System Components
ABB CombiLine busbar modules provide coordinated high-current distribution solutions for low-voltage assemblies, supporting structured power distribution, consistent busbar positioning and efficient integration within compatible switchgear cabinets.
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