Sirius Engineering

A busbar is a rigid electrical conductor, typically made of copper or aluminum, used for efficient transmission and distribution of electrical power within switchgear, panels, and substations.
Key Points:
Used in MV/LV panels, switchgear, and transformers
Carries high current loads
Provides a common connection point for multiple circuits
Usually insulated or enclosed for safety
Types:
Copper busbar – high conductivity, commonly used
Aluminum busbar – lighter and more economical
Insulated busbar – covered with insulation material
Bare busbar – without insulation (used with proper clearance)

The image shows a variety of electrical vacuum interrupters (VIs). These components are commonly used in medium-voltage switchgear such as:
RMUs (Ring Main Units)
VCBs (Vacuum Circuit Breakers)
Contactors
Load Break Switches
What they do
Vacuum interrupters are used to interrupt and isolate current safely during switching or fault conditions. The vacuum environment prevents arc formation and improves safety and lifespan.
Visual clues
Cylindrical ceramic/metal bodies
Bellows-style white insulators
Metal terminals on both ends
Some with red protective housings
Typical specifications
(Varies by model/manufacturer)
Rated voltage: 11kV / 13.8kV / 24kV / 33kV
Rated current: 400A — 2500A
Breaking capacity: up to 31.5kA