The ABB NDBU-95C, catalog number 64008366D, is a Branching Unit engineered to provide safe, reliable, and efficient signal distribution in fieldbus and industrial control networks. It is primarily used within ABB Advant OCS and Symphony Plus systems, acting as a critical interface point where communication lines are branched or split to accommodate multiple devices or field instruments.

Designed with rugged industrial environments in mind, the NDBU-95C supports redundancy, shielding, and fault isolation, making it an essential component in systems requiring high availability and continuous uptime. It simplifies the physical topology of a communication network while maintaining signal integrity and allowing easy maintenance and expansion of I/O or instrumentation.

Product Specifications

Applications

The ABB NDBU-95C is widely used in mission-critical industrial environments where signal branching and communication integrity are vital. It serves various roles in:

• Power Generation Plants

  Facilitates control network branching for turbine monitoring and auxiliary systems.

• Oil & Gas Processing Facilities

  Enables distribution of control signals to remote wellheads, compressors, and RTUs.

• Chemical and Petrochemical Plants

  Provides robust and shielded signal branching in hazardous area zones.

• Water and Wastewater Treatment Plants

  Used in network expansion and segment isolation for pumps, sensors, and actuators.

• Metals and Mining Industry

  Supports harsh-condition operations such as conveyor systems, crushers, and mills.

• Pharmaceutical Manufacturing

  Ensures clean-room compatible signal routing to environmental and batch process instruments.

Key Advantages

• Reliable Signal Branching

  Provides secure distribution of fieldbus communication lines across multiple devices.

• Redundancy Capable

  Can be configured for redundant network paths, improving system resilience and uptime.

• DIN-Rail Mountable

  Easy to install in standard control cabinets with minimal space requirements.

• Shielding Terminals Included

  Reduces electromagnetic interference (EMI), ensuring cleaner signal transmission.

• Tool-Free Maintenance

  Allows quick replacement or troubleshooting without disrupting the entire system.

• System Compatibility

  Works seamlessly with ABB’s Symphony Plus, Advant, and Harmony system architectures.

• Passive Operation

  No external power required for operation, reducing wiring complexity and increasing reliability.

• Compact and Durable

  Designed to handle the rigors of industrial environments while maintaining space efficiency.

Frequently Asked Questions (FAQ)

1. Q: What is the main purpose of the NDBU-95C Branching Unit?

   A: It allows multiple devices to connect to a single fieldbus communication line, effectively branching signals without disrupting communication integrity.

2. Q: Is the NDBU-95C compatible with Symphony Plus systems?

   A: Yes, it is fully compatible with Symphony Plus as well as Advant OCS and Harmony systems.

3. Q: Does this unit support shielded wiring?

   A: Yes, it includes terminals specifically designed for cable shielding, helping reduce EMI.

4. Q: Is external power required to operate the NDBU-95C?

   A: No, it is a passive device and operates without an external power source.

5. Q: Can this branching unit be used in redundant configurations?

   A: Yes, it is suitable for systems requiring redundant network paths or fault-tolerant designs.

6. Q: How many branch outputs does the NDBU-95C support?

   A: It typically supports 5 to 8 branches, depending on its internal configuration and terminal layout.

7. Q: What wire size can be used with the terminals?

   A: The screw terminals typically accept wire sizes up to 2.5 mm².

8. Q: Is the NDBU-95C hot-swappable?

   A: No, devices should be powered down before replacing or modifying connections.

9. Q: Does it comply with industrial certification standards?

   A: Yes, it complies with CE, UL, RoHS, and other relevant industrial standards.

10. Q: Where should this unit be installed?

    A: It is intended to be mounted on DIN rails inside protective control cabinets (IP20 rating).