Why Choose the ABB MBN174 N+PE / Terminal Expansion 1PW?
The ABB MBN174 is a modular N/PE busbar and terminal expansion designed for ABB CombiLine sub-distribution assemblies. Supplied under ABB order code 2CPX041746R9999, this unassembled interior fitting kit combines provision for neutral/protective-earth busbars with additional terminal mounting space and is part of ABB’s DESUJ Sub Distribution product group.
Designed in a 1PW / one-field-width format, the MBN174 measures 250 mm wide × 300 mm high × 200 mm deep and provides 24 space units. It incorporates a horizontal 2-pole N/PE busbar system with an ABB ZX518 busbar holder, together with an additional horizontal DIN rail for terminal blocks.
The MBN174 supports up to two copper busbars and a maximum rated current of 440 A. Its terminal DIN rail is continuously adjustable in depth, providing a usable depth of 90–145 mm and a usable terminal width of 188 mm, while the module can be installed in compatible cabinets from 200 mm depth.
Key Advantages
- Combined N/PE busbar and terminal expansion for ABB CombiLine systems.
- 1PW / 250 mm field width provides a compact modular installation format.
- 2-pole horizontal busbar system for neutral and protective-earth distribution.
- Supports a maximum rated current of 440 A.
- Additional DIN rail provides dedicated mounting space for terminal blocks.
- 90–145 mm adjustable usable depth supports flexible terminal positioning.
Key Features
- ABB MBN174 N/PE busbar and terminal module.
- 1PW / one-field-width configuration.
- 2 GU / 300 mm module height.
- 250 mm module width.
- 24 space units.
- 2-pole horizontal N/PE busbar system.
- 440 A maximum rated current.
- ABB ZX518 busbar holder.
- Supports a maximum of two copper busbars.
- Additional horizontal DIN rail for terminal blocks.
- 188 mm usable terminal width.
- 90–145 mm adjustable usable depth.
Combined N/PE Distribution and Terminal Expansion
N/PE busbar modules provide a structured means of distributing neutral and protective-earth connections within low-voltage electrical assemblies. The ABB MBN174 combines a 2-pole horizontal busbar arrangement with an additional DIN rail, allowing both N/PE distribution and terminal-block mounting to be accommodated within one compact CombiLine module.
The continuously adjustable DIN rail allows the terminal mounting depth to be adapted to the installation, while the ZX518 busbar holder supports compatible copper busbars for currents up to 440 A. This coordinated arrangement makes the MBN174 suitable for professional distribution-board construction where organised wiring, modular integration and accessible termination are required.
Typical Applications
- ABB CombiLine sub-distribution assemblies.
- Neutral and protective-earth busbar distribution.
- Terminal-block mounting and conductor termination.
- Low-voltage electrical distribution boards.
- Commercial and industrial switchboards.
- Panel-building and distribution-board expansion projects.
