Why Choose the ABB MBN274 N+PE / Terminal Expansion 2PW?
The ABB MBN274 is a modular N/PE busbar and terminal expansion kit designed for ABB CombiLine N electrical distribution systems. Supplied under ABB order code 2CPX041748R9999, this unassembled interior fitting module provides a structured solution for installing neutral and protective earth busbars together with terminal blocks inside compatible sub-distribution enclosures.
The MBN274 combines provision for a 2-pole N/PE busbar system with an additional DIN rail for terminal blocks. Its DIN rail can be continuously adjusted in depth using the mounting arrangement, providing a usable depth of 90–145 mm. The module incorporates ABB ZX518 busbar holders and supports up to two copper busbars, which are ordered separately.
With a module height of 300 mm and a 2 PW / 500 mm field width, the MBN274 provides 48 space units and approximately 438 mm usable terminal width. The busbar system supports a rated current of up to 440 A, making this module suitable for substantial commercial and industrial sub-distribution applications.
Key Advantages
- Purpose-designed N/PE busbar and terminal expansion module for ABB CombiLine N systems.
- 2 PW / 500 mm field width provides generous space for distribution equipment.
- 300 mm module height with 48 space units.
- Supports a 2-pole N/PE busbar system with up to two copper busbars.
- Maximum rated current of 440 A for demanding distribution applications.
- Additional DIN rail provides approximately 438 mm usable width for terminal blocks.
- Continuously adjustable mounting depth provides flexible positioning within the enclosure.
- Compatible with EDF and WR mounting frames for flexible CombiLine N construction.
Key Features
- ABB MBN274 N/PE busbar and terminal expansion kit.
- ABB order code 2CPX041748R9999.
- 2 GU / 300 mm module height.
- 2 PW / 500 mm field width.
- 48 space units.
- 2-pole horizontal busbar system.
- Supports a maximum of two copper busbars.
- 440 A maximum rated current.
- Includes ZX518 busbar holders.
- Additional DIN rail for terminal blocks.
- 438 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 MBN274 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 depth-adjustable DIN rail and generous 438 mm usable terminal width provide flexibility when accommodating different terminal configurations. Combined with support for a 2-pole horizontal busbar system rated up to 440 A, the MBN274 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.
