Why Choose the ABB MBN374 N+PE / Terminal Expansion 3PW?
The ABB MBN374 is a modular N/PE busbar and terminal expansion kit designed for ABB CombiLine N electrical distribution systems. Supplied under ABB order code 2CPX041750R9999, this unassembled interior fitting module provides a structured solution for incorporating neutral and protective earth busbars together with terminal blocks inside compatible sub-distribution enclosures.
The MBN374 combines a 2-pole horizontal busbar system with an additional DIN rail for terminal blocks. The DIN rail is continuously adjustable in depth using the ZW59P2 depth angle arrangement, providing a usable mounting depth of 90–145 mm. The module incorporates ABB ZX518 busbar holders, supports a maximum of two copper busbars and is additionally braced in the middle due to its 3-field width.
With a module height of 300 mm and a 3 PW / 750 mm field width, the MBN374 provides 72 space units and approximately 688 mm usable width for terminal blocks. The busbar system has a maximum rated current of 440 A, making the MBN374 suitable for substantial commercial and industrial electrical distribution applications.
Key Advantages
- Purpose-designed N/PE busbar and terminal expansion module for ABB CombiLine N systems.
- 3 PW / 750 mm field width provides generous installation space.
- 2 GU / 300 mm module height with 72 space units.
- Supports a 2-pole horizontal N/PE busbar system.
- Maximum rated current of 440 A for demanding distribution applications.
- Additional DIN rail provides approximately 688 mm usable width for terminal blocks.
- 90–145 mm adjustable usable depth provides flexible component positioning.
- Compatible with EDF and WR mounting frames for flexible CombiLine N construction.
Key Features
- ABB MBN374 N/PE busbar and terminal expansion kit.
- ABB order code 2CPX041750R9999.
- 2 GU / 300 mm module height.
- 3 PW / 750 mm field width.
- 72 space units.
- 2-pole horizontal busbar system.
- Supports a maximum of two copper busbars.
- 440 A maximum rated current.
- Equipped with ZX518 busbar holders.
- Additional depth-adjustable DIN rail for terminal blocks.
- 688 mm usable terminal width.
- 90–145 mm usable mounting depth.
- Closed plastic covers with 90-degree press-and-turn closures.
- RAL 7035 cover finish.
- Suitable from a cabinet depth of 200 mm.
Flexible N/PE Distribution and Terminal Mounting
N/PE busbar modules provide dedicated infrastructure for neutral and protective earth distribution within electrical assemblies. The ABB MBN374 combines this function with an additional DIN rail for terminal blocks, allowing installers to organise power distribution and field wiring efficiently within a single modular section.
The 3-field design provides approximately 688 mm of usable terminal width, while the continuously adjustable mounting depth accommodates different terminal and wiring configurations. Combined with a 2-pole horizontal busbar system rated up to 440 A, the MBN374 provides a versatile solution for professional CombiLine N sub-distribution assemblies.
Typical Applications
- Electrical sub-distribution boards.
- ABB CombiLine N distribution assemblies.
- Neutral and protective earth busbar distribution.
- Terminal block mounting and field wiring.
- Commercial and industrial electrical installations.
- Modular switchgear and distribution panel construction.
