Osculati Heavy Duty Dual Battery Switch High-Power Model - 380AMax Capacity (intermittent): 850A Max Capacity (continuous): 380A Terminals: M12 Voltage: Universal 12 24v Dimensions: 140 x 140 x 85mm Copper contacts stainless steel springs polycarbonate body and fitted with automatic power interruption on the alternator if the battery isolator activates before turning off the engine. Specially suited for diesel engines which due to large starters require heavy amperage.