See? Good and evil. An RCD (or GFCI in the States) is a kind of circuit breaker that trips when the amount of current in the hot and neutral mains power lines aren’t equal and opposite ...

Arc-fault circuit breakers are a boon for household electrical safety. The garden-variety home electrical fire is usually started by the heat coming from a faulty wire arcing over. But as any ...

Circuit breakers, despite any techy magic happening beneath the surface, should be the most predictable things in the world.

Here's what to know about so-called “circuit breakers" and when they're used to halt trading on stock markets.