NDBU-95C ABB 3AFE64008366 Optical Divider

Model: NDBU-95C
Manufacturer: ABB
Product ID: 3AFE64008366
Product Family: NDBU-95
Product Type: DDCS optical communication divider / branching unit

EAN: 6438177221852
Network Topology: Star connection
Drive Channels: 9
Master Interface: 1 DDCS input and 1 DDCS output
Drive Interfaces: 9 DDCS inputs and 9 DDCS outputs
Data Rate: 1–4 MBd, depending on setting
Optical Components: 10 Mb components
Supply Voltage: +24 V DC ±10%
Input Current: 300 mA
Operating Temperature: 0 to +50°C

The ABB NDBU-95C, part number 3AFE64008366, is an optical communication divider for ABB DDCS drive networks. It distributes communication from a master device to multiple connected drive units, making it possible to arrange the network in a star topology.

Although it may be described as an optical divider in spare-parts listings, its documented product function is that of an active DDCS branching unit. It is not simply a passive optical splitter. ABB describes the NDBU-95 as receiving messages from the master and sending them to the connected drives simultaneously; responses from the addressed drive are then returned to the master. This arrangement can help isolate individual drive communication paths.

The NDBU-95C provides nine drive channels, with separate DDCS transmit and receive connections for the drive side, alongside the master-side input and output. Multiple NDBU-95 units can also be arranged in parallel, in series, or in combinations, subject to the applicable network design and transmission-distance limits.

For maintenance teams working with legacy ABB drive systems, the channel layout is a key identification point. A replacement should match the installed communication architecture rather than being selected only because the enclosure or connector arrangement looks similar.

ABB documentation identifies 10 Mb optical components for the NDBU-95 hardware and specifies a configurable data rate of 1–4 MBd. These figures describe different aspects of the hardware and should not be treated as interchangeable.

The unit uses a nominal 24 V DC supply, with a permitted range of ±10%, and has a documented input current of 300 mA. Green channel LEDs indicate message reception, while a separate green indicator monitors the power-supply condition. The documented operating temperature range is 0 to +50°C.

Optical hardware compatibility is particularly important: ABB's documentation states that only channels using the same type of hardware components should be connected together. Confirm the optical component type and configured data rate before reconnecting or replacing the unit.

For purchasing and inventory matching, use the full ABB product number alongside the model designation:

• NDBU-95C
• 3AFE64008366
• ABB NDBU-95 DDCS Branching Unit
• ABB DDCS Optical Divider
• EAN 6438177221852

The terms optical divider, optical branching unit and DDCS branching unit may be used differently across parts listings. The model and product number are more reliable identifiers than the generic name alone.

Before ordering, compare the label on the existing device, the required number of drive channels, the master-side connections, the optical component type and the supply requirements. For an installed system, also verify that the relevant drive and control hardware support the intended DDCS configuration.

Is the ABB NDBU-95C a passive optical splitter?

No. ABB documents the NDBU-95 as a DDCS branching unit that receives and distributes communication messages across connected drive channels.

How many drive channels does 3AFE64008366 support?

The NDBU-95C is specified with nine drive channels, with DDCS input and output connections for each channel.

What is the difference between the optical component rating and data rate?

The documentation identifies 10 Mb optical components and a configurable communication data rate of 1–4 MBd. They describe different hardware characteristics.

What power supply is required?

The specified input is +24 V DC ±10%, with an input current of 300 mA.

What should be checked when replacing an optical divider?

Confirm the NDBU-95C designation, ABB product number, channel arrangement, optical component type, data-rate setting and power requirements. Also check the compatibility of the connected drive communication hardware.

ABB NDBU-95C Optical Divider, product number 3AFE64008366, for replacement and maintenance of compatible DDCS communication networks. Verify the original unit's identification and optical configuration before ordering.

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