Final answer:
An open electrical circuit due to a failed circuit breaker is a fail-open system, which prevents the flow of electricity in the event of a failure, ensuring safety.
Step-by-step explanation:
An open electrical circuit as a result of a failed circuit breaker is considered to be a fail-open system. In such a system, when a failure occurs, the circuit opens and prevents the flow of electricity. This term is often used in safety and reliability engineering to describe a system that, upon failure, fails to a safe or a default state where it does no harm. For instance, a circuit breaker is designed to open and cut off electricity when an overload or a short circuit is detected, thereby preventing potential damage to the electrical system and reducing fire hazards.