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Up to 500A continuous rating for large diesel engines. One-piece tin-plated copper stud design never loosens over time. Terminal studs accept 1/2" or M12 ring terminals. Ignition protected and UL Listed. Selector features make-before-break contact design. AFD ( Alternator Field Disconnect models allow switching while running the engine without damaging the alternator. Cranking Rating 30 sec.: 1600A DCCranking Rating 1 min.: 1150AIntermittent Rating 5 min.: 700AContinuous Rating: 500A