Why Choose the ABB MBT343 NH1 Fuse Switch Expansion 3PW?
The ABB MBT343 is a CombiLine NH1 fuse switch-disconnector expansion module kit designed for high-capacity fused power distribution within professional low-voltage electrical assemblies. Supplied under ABB order code 2CPX041781R9999, this 3PW module is unequipped and prepared for the installation of up to six NH1 fuse switch-disconnectors.
The MBT343 is designed for ABB ZH431 NH1 fuse switch-disconnectors, rated up to 250 A per device, and a three-pole busbar system. Its double-storey arrangement supports a maximum rated current of 630 A, providing a robust modular platform for feeder protection, circuit isolation and fused distribution in compatible ABB CombiLine assemblies.
With a module height of 750 mm, width of 750 mm and installation from a cabinet depth of 225 mm, the MBT343 provides 180 space units. The module is supplied as an unassembled and unequipped kit with RAL 7035 plastic covers featuring equipment cut-outs and 90-degree press-and-turn fasteners; the required WR mounting frame, fuse switch-disconnectors and busbar system are ordered separately.
Key Advantages
- Purpose-designed NH1 fuse switch-disconnector module for ABB CombiLine distribution assemblies.
- Prepared for installation of up to six NH1 fuse switch-disconnectors.
- Compatible with ABB ZH431 250 A NH1 fuse switch-disconnectors.
- Three-pole busbar system supports structured high-current distribution.
- Maximum rated current of 630 A in the double-storey configuration.
- Large 3PW format with 180 space units provides substantial fused-distribution capacity.
Key Features
- ABB MBT343 CombiLine interior fitting module kit.
- 3PW / three-field-width configuration.
- 5 grid units / 750 mm module height.
- 750 mm module width.
- 180 space units.
- Provision for up to 6 × NH1 fuse switch-disconnectors.
- Compatible with ABB ZH431 NH1 fuse switch-disconnectors.
- Three-pole busbar system.
- Maximum rated current of 630 A.
- Plastic covers with equipment cut-outs.
- 90-degree press-and-turn cover fasteners.
- RAL 7035 finish.
- Suitable from a cabinet depth of 225 mm.
Reliable Fused Power Distribution for Electrical Assemblies
NH fuse switch-disconnectors combine fuse-based overcurrent protection with circuit isolation, making them well suited to feeder and distribution circuits in industrial and commercial low-voltage assemblies. The ABB MBT343 provides a structured mechanical platform for integrating up to six NH1 devices into a large three-field-width CombiLine section.
When configured with the appropriate ABB ZH431 fuse switch-disconnectors and three-pole busbar system, the MBT343 provides a modular solution for distributing substantial electrical loads while maintaining organised circuit protection and isolation. Its 630 A maximum rated current and six-device capacity make it particularly suitable for larger distribution-board and switchboard installations.
Typical Applications
- Low-voltage electrical distribution boards.
- Commercial and industrial switchboards.
- NH1 fused feeder circuits.
- High-capacity power distribution sections.
- Main and sub-distribution assemblies.
- Industrial circuit isolation and fuse protection.
- Electrical panel building and system integration.
- ABB CombiLine N interior expansion systems.
