Automatinis įkrovos rele BLUE SEA SI-ACR – 12/24 V DC 120 A

The SI-ACR 7610-BSS automatic charging relay (ACR) is designed to optimize the management of dual-battery systems aboard vessels. It automatically combines batteries during charging and isolates them during discharge or engine start, thereby protecting batteries and sensitive electronic equipment from voltage fluctuations.

The SI-ACR 7610-BSS relay has a continuous capacity of 120 amperes and an intermittent capacity of 210 amperes (for 5 minutes). This makes it suitable for high-power alternators.

Yes, the SI-ACR 7610-BSS relay is designed to operate optimally with 12V and 24V DC electrical systems, automatically adapting to the system voltage.

The Start Isolation (SI) function temporarily disconnects service loads from the engine's starting circuit. This feature prevents voltage drops and spikes that could affect sensitive electronic devices during the engine start process.

The IP67 certification means the relay is protected against temporary immersion up to 1 meter depth for 30 minutes. This allows installation in damp environments or engine compartments without risk of water damage.

The relay should be installed in a dry, protected location, if possible, to prevent corrosion of the wires and connection terminals. It is also advisable to avoid locations directly above battery banks.

No, the SI-ACR relay is not designed to handle engine starting currents. For situations where batteries may need to be combined for emergency starting, it is recommended to use a battery switching system with a combining/parallel function.

To activate the Start Isolation function, connect a wire from the quick-connect terminal marked SI (start isolation) to the terminal or wire running from the ignition switch to the starter solenoid. This connection must be made through an inline fuse rated 1 to 10 amps and must be positive only when the starter is engaged and running.

Yes, it is possible to connect a remote LED indicator lamp that reflects the state of the relay’s built-in LED. To do this:

Connect the red wire of the LED to a 12/24V positive source via a 1–2 amp inline fuse. Connect the yellow wire of the LED to the quick-connect terminal marked LED on the relay.

For continuous charging current ≤120 amperes, a minimum #1 AWG wire size is recommended with a 175-ampere fuse. Larger wire sizes may be required to minimize voltage drop over long distances.

The recommended torque for 3/8"-16 (M10) stud terminals is 140 in-lbs (15.8 Nm). It is critical to respect this torque to ensure a safe and reliable electrical connection.

The SI-ACR relay features dual sensing. This means it can detect an available charge source on either of the battery banks, ensuring efficient power distribution.

The relay combines the batteries when the voltage at either terminal reaches a charging level. For a 12V system, this occurs if the voltage is above 13.6V DC for 30 seconds, or above 13.0V DC for 2 minutes. For a 24V system, the thresholds are 27.2V DC for 30 seconds or 26.0V DC for 2 minutes.

The relay isolates the batteries when the voltage drops below a set threshold, indicating no charging or discharge. For a 12V system, this occurs if the voltage is below 12.75V DC for 30 seconds, or below 12.35V DC for 10 seconds. For a 24V system, the thresholds are 25.5V DC for 30 seconds or 24.7V DC for 10 seconds.

The Over Voltage Lockout (OVL) function protects equipment by isolating batteries if system voltage exceeds a critical threshold. For a 12V system, the relay opens if voltage exceeds 16.0V DC.

The relay includes an undervoltage lockout that prevents it from closing if a battery's voltage is too low. For a 12V system, it will not close if the voltage is below 9.5V DC. For a 24V system, the threshold is 19.0V DC. This protects the relay from potential overcurrent surges and allows the weak battery to recover.

Yes, the relay is ignition-protected, making it safe for installation aboard gasoline-powered boats. It complies with external ignition protection requirements per ISO 8846, UL 1500, and SAE J1171.

Yes, with a continuous capacity of 120 amperes and an intermittent capacity of 210 amperes, the SI-ACR 7610-BSS is perfectly suited to manage the load of high-power alternators.

Blue Sea Systems supports its products for as long as you own them, reflecting confidence in the quality and durability of its equipment.