Determining if an Eaton circuit breaker has failed involves checking for several physical and functional indicators: frequent nuisance tripping without an overloaded circuit, a spring handle that feels loose, spongy, or fails to stay firmly in the ON position, visible burn marks, soot, or melted plastic around the housing terminals, or a burning plastic odor emanating from the load center. You can verify failure by testing terminal voltage output with a digital multimeter while the breaker is switched ON.
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