Blue Sea Systems 12V DC 500A ML-ACR Automatic Charging Relay with Manual Control
Model: 7622-BSS
This relay is a great choice for managing large battery banks. It automatically handles the charging of two big battery banks and allows them to be paralleled for emergency starting. With a 500 Ampere continuous rating, it can support high-output alternators. The Magnetic Latch (ML) design draws very low current. Dual sensing keeps track of the charge on both battery banks. The Start Isolation (SI) feature can protect sensitive electronics during engine cranking, and the Engine Isolation (EI) can safeguard engine electronics and maximize alternator output when both engines are running. There's also a manual control switch for extra safety, which works with or without power and has a LOCK OFF option for servicing. A 500 Amp magnetic latching relay combines batteries during charging and isolates them when discharging or starting the engine.
Specifications| Control Circuit Connection | Tinned Wire |
| Nominal Voltage | 12V DC |
| Manual Control | Yes |
| Engine Isolation | Yes |
| Mounting | #10 |
| Start Assist | Yes |
| Start Isolation | Yes |
| Amperage Operating Current | 13mA |
| Terminal Stud Torque | 140 in-lb (15.82 Nm) |
| Continuous Rating | 500A |
| Intermittent Rating | 700A (5 min) |
| Cranking Rating 30 sec | 1450A DC |
| Minimum Operating Temperature | -10° C |
| Maximum Operating Temperature | 60° C |
| Cable Size to Meet Ratings | 4/0 AWG x 2 |
| Live Current Switching | 300A @ 12V DC |
| Stud Material | Tinned Copper |
| Switching Cycles | 100000 |
| Terminal Stud Length | 1.50in (38.1 mm) |
| Terminal Stud Size | 3/8' - 16 (M10) |
| Wire Size | 20 AWG |
What's in the Box:- ML-ACR Automatic Charging Relay with manual Control 12v
- SPDT Remote Control Contura Switch - ON-OFF-ON
Using this Blue Sea ML - ACR Automatic Charging Relay is quite straightforward. First, make sure to connect the control circuit using the tinned wire as specified. The nominal voltage is 12V DC, so ensure your power source matches this. You can let the relay automatically manage the charging of your two battery banks. If you need to start your engine in an emergency, use the feature that allows paralleling of the battery banks. The manual control switch gives you an extra layer of safety. You can operate it with or without power and use the LOCK OFF function when servicing the relay. When it comes to mounting, use the #10 method as recommended. For cables, use 4/0 AWG x 2 to meet the ratings. Remember, the relay has a continuous rating of 500A, so don't overload it. The operating temperature should be between -10°C and 60°C. If you notice any issues or if the relay has been used for a long time, check the terminal stud torque (it should be 140 in - lb or 15.82 Nm). Also, keep an eye on the amperage operating current, which is 13mA under normal conditions. This relay is built to last with 100000 switching cycles, but proper maintenance will ensure its long - term performance.
