Why Choose the ABB MR303 Busbar Module Expansion 3PW?
The ABB MR303 is a CombiLine busbar module expansion designed for 60 mm horizontal busbar systems in low-voltage sub-distribution assemblies. Supplied under ABB order code 2CPX041416R9999, this mounted interior module provides a structured platform for integrating D0 and NH fuse switch disconnectors or compatible bus-mounted fuse sockets.
As part of the ABB DESUJ Sub Distribution product group, the MR303 is configured for a 3-pole horizontal busbar system and incorporates the ABB ZX146 busbar holder. It accommodates up to three copper busbars and is supplied unpopulated, allowing the appropriate switching or fuse equipment to be selected for the application.
The 3PW configuration provides a module width of 750 mm, a height of 450 mm and a useful width of 665 mm. With 108 PLE, a maximum rated current of 630 A and a minimum cabinet depth of 275 mm, the MR303 is well suited to substantial commercial and industrial distribution assemblies.
Key Advantages
- Purpose-designed 60 mm horizontal busbar module for ABB CombiLine systems.
- 3PW / 750 mm width provides generous equipment installation space.
- Maximum rated current of 630 A.
- Supports a 3-pole busbar system with up to three copper busbars.
- Suitable for vertical installation of D0 and NH fuse switch disconnectors or compatible bus-mounted fuse sockets.
- Integrated ZX146 busbar holder and additional centre bracing for the 3-field format.
Key Features
- ABB CombiLine interior expansion module.
- MR303 Busbar Module Expansion 3PW.
- 60 mm busbar centre distance.
- Horizontal busbar orientation.
- Capacity for a maximum of 3 copper busbars.
- 108 PLE installation capacity.
- Closed plastic cover with 90-degree press-and-turn closure.
- Designed for expansion on a separately ordered WR mounting frame.
High-Capacity Busbar Expansion for Distribution Systems
The ABB MR303 provides a modular 60 mm busbar platform for distributing power and mounting compatible fuse switching equipment within CombiLine low-voltage assemblies. Its horizontal 3-pole arrangement supports organised integration of vertically mounted D0 and NH fuse switch disconnectors or compatible bus-mounted fuse sockets.
With a maximum rated current of 630 A, 108 PLE and additional centre support for its three-field construction, the MR303 provides a robust solution for larger distribution panels where equipment capacity, accessibility and structured busbar distribution are important.
Typical Applications
- ABB CombiLine low-voltage distribution boards.
- 60 mm horizontal busbar systems.
- D0 and NH fuse switch disconnector installations.
- Commercial and industrial sub-distribution panels.
- Bus-mounted fuse equipment installations.
- Professional panel-building and switchgear applications.
