Each ring network connection line can be equipped with a load switch or vacuum circuit breaker.

Any branch circuit can freely withdraw from and put into operation, while other ring network circuits are not affected.

A fuse can be attached to the load switch. When a short circuit occurs in a certain branch circuit, the fuse on this branch circuit can quickly disconnect the faulty circuit and impact the tripper of the load switch to trip it. The faulty circuit is isolated, ensuring the power supply continuity of the non-faulty branch circuit.