Heavy-Duty Battery Selector SwitchThe 721 Battery Selector Switch is our heavy duty selector switch. Housed in the same module as the 720, it includes the same removable plates and back cover. While BEP Marine recommends isolated battery systems as outlined with our distribution clusters, the 721 offers a simple economical way of separating two batteries. Please note selector switches will not separate electronics from harmful engine starting spikes.Specifications: DC Voltage: 48 Stud Size (Imperial): 3 x 3/8" Stud Size (Metric): 2 x 10mm Continuous Rating: 350 Intermittent Rating: 500 Cranking Rating: 1500 WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.