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.
