Samlex ACR-300 Automatic Charge Separator 300 AMP [ACR-300]ACR 300 Automatic Charge Separator 300 AMP The ACR 300 combines battery banks for charging and isolates them when charging has stopped. It provides priority for charging only the starter battery first and protects from excessive discharging of the starter battery. The Automatic Charge Separator is also referred to as a battery separator, battery isolator, or an automatic charging relay. Features: Microprocessor controlled, dual sensing Starter battery