7620. Manual Control: No. Coil Voltage: 12V DC. Combines battery banks during charging and isolates under discharge. 500 Ampere continuous rating suitable for use with large battery banks, starters, alternators, and inverter/chargers. Includes ML-Series Remote Control Contura Switch PN 2146. Silver alloy contacts provide high reliability. 3/8" copper studs, using Blue Sea Systems superior one piece stud technology, suitable for 300 Ampere continuous rating and large cable connections. 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.