These high-performance cut-outs protect power cables and the low-voltage devices in buildings and rooms that depend on them from residual current. Unlike fuses, which cannot be used after they are triggered, a circuit breaker can be reset. The functionality is quite simple: If a faulty consumer, such as a machine, needs too much current for a long period of time, the circuit breaker automatically disconnects the downstream circuit from the grid. Greater current consumption can overheat the conducting cables and cause fires. To ensure that the circuit breaker is not triggered when a vacuum cleaner turned on, for example there are many circuit breaker versions with varying triggering characteristics, performance index, and features.