Sub Main Distribution Boards (SMDB) by NLC
Low Voltage

Sub Main Distribution Boards (SMDB)

Built with Schneider Electric: PrismaSeT, Blokset, Acti9, ComPact NS/NSX, EasyPact CVS

Sub Main Distribution Boards take power from the MDB and feed local distribution boards, mechanical equipment, and dedicated circuits within a zone of the building. They reduce cable lengths and provide intermediate protection between the main board and final circuits.

Schneider Electric's PrismaSeT range covers SMDBs from compact wall-mounted enclosures up to floor-standing assemblies with Acti9 modular protection or ComPact NS/NSX and EasyPact CVS MCCBs.

Schneider Electric Source

For full technical specifications, datasheets, and certifications, refer to Schneider Electric's official product range:

PrismaSeT, Blokset, Acti9, ComPact NS/NSX, EasyPact CVS

Sub-Main Distribution Board

Key Features

  • Wall-mounted or floor-standing enclosures
  • Acti9 modular DIN-rail protection
  • Up to 4000 A bus rating
  • Optional metering and monitoring modules
  • Compatible with PowerLogic energy management

Typical Applications

  • Floor-level distribution in commercial towers
  • Sub-distribution to mechanical and HVAC plants
  • Process areas in industrial facilities
  • Multi-zone retail and hospitality projects

Choosing an SMDB for building power distribution

An SMDB receives power from the main distribution board and supplies downstream boards or dedicated equipment. Selecting a board starts with the loads it serves, its position in the distribution system and the project protection requirements.

Electrical design inputs
Send the single-line diagram, load schedule, supply voltage, specified current rating and project fault-level information.
Outgoing circuits
List the downstream distribution boards, HVAC equipment and other loads, with the required protection and spare capacity.
Space and installation
Specify wall or floor mounting, available dimensions, cable entry direction, access requirements and the installation environment.
Monitoring and handover
Identify metering, energy-management interfaces, drawing approvals and the required factory and site acceptance documentation.

Published range capabilities describe available options. The rating, protective devices and enclosure of your SMDB must be confirmed for its particular design and installation.

Main distribution boardsFinal distribution boardsPower distribution solutions

Need a quote for Sub Main Distribution Boards (SMDB)?

Send us your project specs. Our power engineers will respond with a configured proposal.

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FAQ

Frequently asked questions

What is a Sub Main Distribution Board (SMDB)?

An SMDB takes power from the MDB and feeds local distribution boards, mechanical equipment, and dedicated circuits within a zone of the building. It reduces cable lengths and provides intermediate protection between the main board and final circuits.

What bus rating do NLC's SMDBs support?

SMDBs support up to a 4000 A bus rating, in wall-mounted or floor-standing enclosures.

Which Schneider Electric products are used in NLC's SMDBs?

They use the PrismaSeT range, from compact wall-mounted enclosures up to floor-standing assemblies, with Acti9 modular DIN-rail protection or ComPact NS/NSX and EasyPact CVS MCCBs.

Do SMDBs offer metering and energy management?

Yes. SMDBs include optional metering and monitoring modules and are compatible with PowerLogic energy management.

Where are SMDBs typically applied?

Typical applications include floor-level distribution in commercial towers, sub-distribution to mechanical and HVAC plants, process areas in industrial facilities, and multi-zone retail and hospitality projects.

What protection devices are used inside an SMDB?

SMDBs use Acti9 modular DIN-rail protection for smaller outgoing circuits and ComPact NS/NSX and EasyPact CVS MCCBs for larger feeders, configured to the load profile of each project.

Can SMDBs be wall-mounted to save space?

Yes. The PrismaSeT range covers compact wall-mounted enclosures up to floor-standing assemblies, so the format can be matched to the available space and rating.

How long does it take to get an SMDB quote and delivery?

Send us your single-line diagram and load schedule, and our power engineers will respond with a configured proposal covering rating, protection, and metering options.