Circuit breakers don't work for plasma conduits.

Why not? Plasma moves like a fluid, and we are perfectly capable of shutting off or limiting the flow of a fluid in an emergency.

They wouldn't employ a technology across an entire fleet of starships, and practically every corner of civilisation on and off world, if they weren't able to manage it to am extremely high degree of safety.

Just look inside the armoured citadel on a battleship for examples of how every single thing no matter how small are designed to ensure the crew remain unharmed and the vessel functional.

Anyway, the real problem is that we fill our consoles with rocks.