Power systems quietly and reliably move enormous amounts of energy every day. But when things go wrong—when there is too much current or a fault on the line, something has to act fast. That job belongs to the circuit breaker. In this episode, host Dave Whitehead and guest Kylan Robinson, engineering director at SEL, discuss how circuit breakers sense trouble, interrupt currents as powerful as a lightning bolt, work with protective relays to keep the grid safe, and are evolving to meet new demands.