7622100 ML ACR Charging Relay 12V 500A with Manual Control & Deutsch Connector500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine.Features:. Manual control switch provides an added level of safety allowing control with or without power, and offering LOCK OFF capability for servicing. Automatically manages the charging of two large battery banks. Allows paralleling of battery banks for emergency starting. 500 Ampere continuous rating to support high-output alternators. Magnetic Latch (ML)""ACR draws very low current (