A small busbar interconnection switch is typically located between sections of a sectionalized busbar system, allowing controlled connection or isolation of bus sections.

Function and Placement

In electrical switchgear and substations, busbars are conductive bars that distribute power to multiple outgoing feeders or equipment . When a busbar is divided into sections for reliability, a busbar interconnection switch (often a circuit breaker or isolator) is installed between the sections. This switch allows operators to:

• Connect two bus sections to share load
• Isolate a section for maintenance or fault conditions
• Maintain continuity of supply while minimizing downtime

Typical Locations

• Indoor Substations or Switchboards: The interconnection switch is mounted on the busbar support structure, often in the middle of the busbar layout, connecting the main and spare sections .
• Sectionalized Busbar Systems: In a single bus-bar system with sectionalization, the bus is divided into two or more sections. The interconnection switch is placed between these sections, enabling selective isolation without shutting down the entire system .
• Compact or Small Systems: In smaller distribution panels or low-voltage switchboards, the interconnection switch may be a small-rated breaker or switch directly bridging the busbar segments, often rated for the expected load of the connected sections .

Key Considerations

• The switch must be rated for the voltage and current of the busbar sections it connects.
• It should be easily accessible for operation and maintenance.
• Proper insulation and clearance are required to prevent short circuits or overheating . In summary, a small busbar interconnection switch is physically located between busbar sections, either in a substation, switchboard, or distribution panel, and serves to connect or isolate sections for operational flexibility and safety.