How does a circuit breaker differ functionally from the fuse concept established by Murray?
Answer
A circuit breaker is designed to be reset after an overload event.
The fundamental difference in function lies in the aftermath of an interruption. A fuse, as developed by Murray and understood in its basic form, is inherently a sacrificial device; once it blows due to an overcurrent, the protective element is destroyed and must be physically replaced to restore the circuit. In contrast, a circuit breaker is engineered as a reusable mechanical switch. After it trips due to an overload event, it is designed with the capability to be manually or automatically reset, allowing the circuit to be re-energized without requiring the replacement of any internal component.
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