Isolate the fault, preserve the rest
Protection coordination aims to clear a fault while limiting unnecessary loss of supply elsewhere.
In 30 seconds
- A downstream fault should be considered with both upstream and downstream protection.
- Selectivity depends on device characteristics and fault conditions.
- Settings require engineering study and approved documentation.
Make it concrete
On a drawing, shade one faulty branch while keeping two healthy branches visible. Ask which protective boundary should contain the problem.
- 01Source
- 02Protection
- 03Load branches
Check your understanding
Is choosing a larger breaker always a solution to repeated trips?
- A downstream fault should be considered with both upstream and downstream protection.
- Selectivity depends on device characteristics and fault conditions.
- Settings require engineering study and approved documentation.
Go to the source
Sources reviewed: 13.09.2026