Relé de càrrega automàtic ML-ACR amb control manual - 12 V CC 500 A

The Blue Sea Systems ML-ACR (Automatic Charging Relay) is a device designed to manage high-demand battery systems. It automatically combines and isolates battery banks, ensuring efficient charge distribution with very low current draw whether the relay is ON or OFF. This model is specifically designed for 12V DC systems with a continuous capacity of 500A.

This ML-ACR relay has a DC current capacity of 500 amperes (A). It can also handle an intermittent current of 700A for 5 minutes and a cranking rating of 1450A for 30 seconds when wired with 2x 4/0 AWG (2x 120 mm²) cables.

Yes, the ML-ACR relay is designed to be robust and durable in harsh environments. It is rated IP66, meaning it is protected against powerful water jets and dust, making it ideal for marine and automotive applications.

The Magnetic Latching (ML) technology allows the relay to maintain its state (ON or OFF) without continuously consuming power. It only draws a moderate current for a very brief period during state changes. This significantly reduces the system's overall power consumption.

Yes, this ML-ACR relay model (PN 7622) is supplied with a Contura remote control switch of SPDT ON-OFF-ON type, allowing manual control of the relay functions from a convenient location such as the helm station.

The ML-ACR relay integrates two advanced isolation functions:

Start Isolation (SI): Temporarily isolates house loads from the engine circuit during engine start, protecting sensitive electronics from voltage drops.Engine Isolation (EI): Can be configured to isolate two engines in operation, protecting engine electronics and optimizing alternator output.Note that the ML-ACR can be configured for either of these functions, but not both simultaneously.

To achieve the continuous 500A capacity of this relay, it is recommended to use 2x 4/0 AWG (2x 120 mm²) wiring. This sizing ensures maximum conductivity and optimal performance under high loads.

The recommended maximum torque for 3/8"-16 (M10) terminal studs is 140 in-lb (15.8 N•m). It is critical to adhere to this specification to ensure a secure electrical connection and prevent damage to the relay.

The physical dimensions of the ML-ACR relay (model 7622) are as follows:

Width: 95.3 mm (3.75 inches)Height: 138.9 mm (5.47 inches)Depth: 51.6 mm (2.03 inches)Its weight is approximately 0.93 kg (2.04 lb).

Yes, the ML-ACR relay complies with ISO 8846 and SAE J1171 ignition protection requirements, making it safe for use in engine compartments of boats where flammable vapors may be present.

In automatic mode (for a 12V DC system), the relay combines battery banks when the detected voltage reaches:

More than 13.5V for 30 seconds, or
More than 13.0V for 90 seconds.
This ensures that batteries are only combined when a charge is present and stable.

In automatic mode (for a 12V DC system), the relay isolates the battery banks when the detected voltage drops below:

12.35V for 10 seconds, or 12.75V for 30 seconds. This protects the batteries from excessive discharge and ensures one bank remains available for starting.

The standard ML-ACR relay (reference 7622B-BSS) is optimized for AGM/GEL to AGM/GEL and AGM/GEL to lithium battery configurations. However, it is not specifically designed for lithium-to-lithium or lithium-to-lead-acid systems due to predefined voltage thresholds. For full compatibility with lithium battery systems, the ML-ACR Li-Ion version is recommended.

The ML-ACR relay includes protections against extreme voltages:

Undervoltage lockout: The relay prevents battery combining if the voltage of any battery is below 9.6V (for a 12V DC system). Overvoltage lockout: The relay prevents battery combining if the voltage of any battery is above 16.2V (for a 12V DC system). These thresholds protect the relay and batteries from hazardous conditions.

No, this specific model of the ML-ACR automatic charging relay (reference 7622B-BSS) is designed and specified to operate only with 12V DC systems. Other models in the ML-ACR series are compatible with 24V DC systems, but this one is not.

The Magnetic Latching (ML) technology ensures very low current consumption. In the ON or OFF state, the relay consumes less than 13mA at 25°C and at nominal voltage (12V DC). During state changes, consumption is moderate, but only for approximately 20 milliseconds.

The relay contacts are made of silver alloy, ensuring high reliability for switching loads under voltage. The terminal studs are 3/8"-16 (M10) tin-plated copper, providing maximum conductivity and excellent corrosion resistance in marine environments.

The remote control switch has two LEDs that indicate the relay status:

LEDs off: Batteries are isolated.LEDs on: Batteries are combined.Slow, steady flashing: Start isolation (SI) or engine isolation (EI) is active.Fast, steady flashing: Undervoltage lockout (below 9.6V) or overvoltage lockout (above 16.2V).Double flash (Blink-Blink-Pause): Indicates manual control or a mechanical relay failure.

Although both are isolation functions, they serve different purposes:

Start Isolation (SI): Temporarily isolates house loads from the engine circuit during engine start. This protects sensitive electronics from voltage drops and spikes that can occur when starting the engine.

Engine Isolation (EI): Isolates two engines when both are running. This is useful for protecting the electronics of each engine and optimizing the output of each alternator, especially when engine manufacturers require it or when each engine has its own starter battery.

The ML-ACR can be configured for either of these functions, but not both simultaneously.