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.
