Blue Sea Systems 7622 ML-ACR Automatic Charging Relay 12V 500A

System Voltage: 12V DC
Continuous Amperage: 500A*
5 Minute Intermittent Amperage: 700A*
30 Second Cranking Amperage: 1450A*
*Requires parallel 4/0 AWG cables to achieve ratings
Battery Bank Inputs: 2
Relay Function: Bi-Stable
Current Draw Open/Closed State: 0A
Current Draw Changing State: 7A @ 40 ms
Mechanical Endurance Low Current: 100,000 Cycles
Mechanical Endurance 300A Live Switching: 10,000 Cycles
Remote Switch Function: Latched SPDT
Ignition Protected: Yes, ISO 8846 and J1171
Ingress Protection: IP66 - water resistant protected against powerful water jets

Relay Positions
Combine 30 Seconds: 13.5V
Combine 90 Seconds: 13.0V
Open 10 Seconds: 12.35V
Open 30 Seconds: 12.75V
Open High Voltage: 16.2V

Stud Size: 3/8in
Stud Count: 2
Max Wire Size: Parallel 4/0 AWG*
*Requires parallel 4/0 AWG cables to achieve ratings
Mounting Holes: 4
Mounting Screw: #10 (M5)
Mounting Options: Surface mount
Pigtail Wire Size: 16 AWG
Pigtail Wire Count: 5
Start Isolation Wires: 3
Remote Switch Format: Carling Contura 2/3

The ML-ACR functions like all other ACRs. The ACR senses voltage on either battery bank and when it is above charging voltages it combines both banks automatically. This is the equivalent of switching the selector switch to 1+2 (but automatically). When the charging source is turned off and the voltage drops below the designated voltage the ACR isolates the banks leaving them as 2 separate banks again, automatically. Then the cycle repeats itself. The result is you only turn the switch on at the beginning of the day, and off at the end. You never worry about the ACR during the day. Automation is a beautiful thing.

These ML-ACRs are special with their ability to continuously handle 500A, switch live currents, and have 0A operating current when open or closed.

All of those features make this a great ACR, but sometimes it's the little things that take a product from great to phenomenal. For us the manual override knob on this ACR does just that. So not only is it an ACR but can be a remotely controlled parallel switch for jumpstarting. This ML-ACR does it all.