Blue Seas ML-ACR Automatic 500A Charging Relay Solenoid w/ Manual Control Switch 7622100B

Specifications: 12V/500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine,
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 (<40mA to monitor terminal voltage) in the "ON" or "OFF" states, and draws moderate current for very short time when changing state,
Dual sensing—senses charge on both battery banks
Start Isolation (SI)—can be configured for temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics,
Engine Isolation (EI)—can be configured for isolation of two engines while both are running to protect engine electronics and maximize alternator output,
Senses charging on two battery banks,
LED output to remotely indicate when batteries are combined, isolated, in voltage lockout, or in Start or Engine isolation,
3/8"-16 tin-plated copper studs for maximum conductivity and corrosion resistance,
7/8" (22mm) stud length accepts multiple cable terminals
Silver alloy contacts provide high reliability for switching live loads,
Label recesses for circuit identification.