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Choosing an MCB by its amp rating alone leaves several important questions unanswered: will it tolerate the load’s starting current, disconnect a fault at the far end of the cable, and interrupt the highest fault current available at the panel?…

A familiar ampere value is not enough to select a miniature circuit breaker (MCB). Devices with the same current marking can have different voltage ratings, magnetic trip thresholds and short-circuit duties. Interpreting the complete nameplate helps avoid nuisance tripping and…