KBOs are typically used in Main Distribution Boards (MDBs) and Sub Distribution Boards (SDBs) to provide overcurrent protection and safe power distribution.

Overview of KBO in Distribution Boxes

A KBO (commonly a type of molded case circuit breaker or MCCB) is used in distribution boxes to protect electrical circuits from overloads and short circuits. It is generally installed in Main Distribution Boards (MDBs), which serve as the central hub for distributing electricity to various sections of a building or facility, and in Sub Distribution Boards (SDBs), which redistribute power locally to specific areas such as floors, garages, or industrial sections .

Main Distribution Board (MDB)

• Function: Acts as the primary distribution point for electrical power from the utility supply.
• Components: Includes bus bars, MCCBs (or KBOs), fuses, and other protective devices.
• Applications: Used in residential complexes, commercial buildings, and industrial units to manage high-capacity loads and ensure safety .
• KBO Role: Provides main overcurrent protection and can disconnect power in emergencies.

Sub Distribution Board (SDB)

• Function: Receives power from the MDB and distributes it to localized circuits.
• Components: May include smaller MCCBs, MCBs, and KBOs depending on load requirements.
• Applications: Ideal for specific areas like individual floors, workshops, or outdoor installations.
• KBO Role: Protects branch circuits and ensures safe operation of downstream equipment .

Key Points

• KBOs are essential for both main and subpanels to prevent electrical hazards.
• They are integrated into industrial, commercial, and residential distribution boxes depending on the load and safety requirements.
• Proper selection of a KBO depends on current rating, voltage, and the number of circuits in the distribution box . In summary, distribution boxes that use KBOs are primarily Main Distribution Boards (MDBs) and Sub Distribution Boards (SDBs), where they serve as critical protective devices to manage and safeguard electrical circuits efficiently.