Americans everywhere have experienced power outages, often caused by electrical circuit breakers that shut off power when the current in an electrical line exceeds a certain threshold. Many of us have wondered at some point why circuit breakers trip, and what triggers them. Thankfully, there is a fairly straightforward explanation for why this happens and what triggers circuit breakers to trip.
Circuit breakers are designed to shut off electricity when they detect the current passing through them is too high or too low. This protects both the power lines and the appliances in your home from potential damage due to power surges or overloading. In order to understand what triggers a circuit breaker, it’s important to first understand how they work. Circuit breakers use two types of sensors: one to detect overcurrent and one to detect undercurrent. When the current rises above the maximum threshold, the overcurrent sensor will detect it and shut off power to prevent the overload from damaging the lines or appliance. When the current drops below the minimum threshold, the undercurrent sensor will detect it and shut off power to prevent any potential damage to the lines or appliance.
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