{"title":"Battery charge relay","description":"\u003ch2\u003eBattery charging relays: distributing charge without mixing battery banks\u003c\/h2\u003e\n\u003cp\u003eAn automatic charging relay, often called an ACR (\u003cem\u003eAutomatic Charging Relay\u003c\/em\u003e), connects two battery banks only when a charging source is actually available. While sailing, it allows, for example, charging the house bank from the engine alternator while keeping the start battery isolated when the voltage drops.\u003c\/p\u003e\n\u003cp\u003eThis collection includes Blue Sea Systems charging relays suitable for 12 V and 24 V marine installations: compact 65 A models, 120 A relays with or without start isolation, 500 A ML-ACR magnetic latch relays, and Add-A-Battery kits combining ACR and Dual Circuit Plus battery switch.\u003c\/p\u003e\n\n\u003ch2\u003eChoosing the right rating: 65 A, 120 A or 500 A\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/en-us\/products\/blue-sea-m-series-relais-charge-automatique-12-24v-65a\"\u003eBlue Sea m-Series 7601 - 65 A\u003c\/a\u003e: compact ACR relay for small 12\/24 V installations, moderate alternators, powered dinghies, lightweight motorboats, or simple refits with two batteries.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/en-us\/products\/blue-sea-batterylink-relais-charge-automatique-12v-24v-120a\"\u003eBatteryLink 7611 - 120 A\u003c\/a\u003e: 12\/24 V solution for two battery banks, with 210 A intermittent rating, when a simple automatic coupling is needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/en-us\/products\/blue-sea-si-acr-relais-charge-automatique-120a-12-24v\"\u003eSI-ACR 7610 - 120 A\u003c\/a\u003e: 12\/24 V model with \u003cem\u003eStart Isolation\u003c\/em\u003e, useful for protecting electronics, chartplotters, and computers from voltage drops or spikes during engine starts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/en-us\/products\/blue-sea-ml-acr-relais-charge-automatique-500a-12v\"\u003eML-ACR 7620 - 12 V 500 A\u003c\/a\u003e, \u003ca href=\"\/en-us\/products\/blue-sea-relais-charge-automatique-ml-acr-12v-500a\"\u003eML-ACR 7622B - 12 V 500 A with manual control\u003c\/a\u003e and \u003ca href=\"\/en-us\/products\/blue-sea-ml-acr-relais-charge-automatique-24v-500a-manuel\"\u003eML-ACR 7623 - 24 V 500 A\u003c\/a\u003e: magnetic latch relays for high-output alternators, large battery banks, and high starting currents.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/en-us\/products\/blue-sea-mini-add-a-battery-kit-65a-relais-charge-automatique\"\u003eMini Add-A-Battery 7649 - 65 A\u003c\/a\u003e and \u003ca href=\"\/en-us\/products\/blue-sea-add-a-battery-kit-gestion-batterie-120a\"\u003eAdd-A-Battery 7650 - 120 A\u003c\/a\u003e: complete kits with ACR relay and Dual Circuit Plus battery switch, useful when a clean start + house bank system must be created.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical points to check before ordering\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal voltage\u003c\/strong\u003e: most ACRs in this selection accept 12\/24 V, but ML-ACR models are available in dedicated 12 V or 24 V versions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous current\u003c\/strong\u003e: 65 A for small systems, 120 A for common setups, 500 A for high-output alternators, large banks, or battery combining needs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoupling and opening thresholds\u003c\/strong\u003e: Blue Sea models typically combine around 13.0–13.6 V in 12 V systems, then isolate the bank when voltage drops to around 12.35–12.75 V. In 24 V systems, thresholds are doubled.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStart Isolation\u003c\/strong\u003e: recommended if the onboard electronics network resets or drops out during engine starts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine protection\u003c\/strong\u003e: models in this range are IP66 or IP67 depending on the reference, with ignition protection for gasoline engine compartments on relevant references.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWiring\u003c\/strong\u003e: a 500 A relay only makes sense if cable gauge, terminals, fuses, and battery switches are sized accordingly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eACR, diode isolator, or DC\/DC charger?\u003c\/h2\u003e\n\u003cp\u003eAn ACR relay is effective when sharing a charging source between two banks with the same electrical logic, with minimal losses and no diode voltage drop. It is not automatically the best solution for all lithium architectures: whenever the house bank is LiFePO4, verify the BMS, alternator protection, charge curve, and current limits. In some cases, a \u003ca href=\"\/en-us\/collections\/dc-dc\"\u003eDC\/DC charger\u003c\/a\u003e or a \u003ca href=\"\/en-us\/collections\/bms-batteries\"\u003eBMS\u003c\/a\u003e-controlled architecture will be cleaner than a simple coupling relay.\u003c\/p\u003e\n\n\u003ch2\u003eSkysat advice\u003c\/h2\u003e\n\u003cp\u003eDo not choose a charging relay based solely on price or maximum rating. Start with the alternator, number of battery banks, battery chemistry, cable length, and expected behavior during engine starts. For a classic engine + house bank setup in lead-acid, AGM, or gel, an SI-ACR 120 A or an Add-A-Battery kit often covers the need. For large banks, high-output alternators, or manual combining needs, the ML-ACR 500 A family is more appropriate.\u003c\/p\u003e\n\u003cp\u003ePair with \u003ca href=\"\/en-us\/collections\/coupe-batteries\"\u003ebattery switches\u003c\/a\u003e, \u003ca href=\"\/en-us\/collections\/fusibles\"\u003efuses\u003c\/a\u003e, \u003ca href=\"\/en-us\/collections\/distribution\"\u003ebusbars\u003c\/a\u003e, and \u003ca href=\"\/en-us\/collections\/moniteurs-de-batterie\"\u003ebattery monitors\u003c\/a\u003e to create a clean, maintainable architecture.\u003c\/p\u003e","products":[{"product_id":"quick-repartiteur-charge-electronique-1e-2s-160a","title":"Battery distributor 1E\/2S\/160A","description":"\u003cp\u003e\n    Designed to optimize energy management on board, the QUICK RC162 electronic load distributor (model ECS162 \/ FBECS1620000D00) is a solution dedicated to 12V and 24V systems. This device efficiently and independently recharges multiple battery banks from a single charging source, such as an alternator. With one input and two outputs, it manages a maximum charging current of 160 amperes per input, ensuring proper distribution to connected batteries.\n\u003c\/p\u003e\n\n\u003ch3\u003eMOSFET technology for optimized charging\u003c\/h3\u003e\n\u003cp\u003e\n    The QUICK RC162 distributor integrates MOSFET technology, giving it the major advantage of operating with negligible, even zero, voltage drop. Unlike traditional diode-based distributors that can cause significant voltage loss, this model ensures that your batteries receive the full charging voltage from your alternator or charger, optimizing their lifespan and recharge speed. It isolates battery banks, preventing mutual discharge, and automatically distributes current to the least charged battery for maximum efficiency.\n\u003c\/p\u003e\n\n\u003ch3\u003eDesign and installation\u003c\/h3\u003e\n\u003cp\u003e\n    With dimensions of 195 x 68 x 135 mm (L x H x W) and a weight of approximately 1.2 kg, the RC162 features a compact design that facilitates installation and wiring in various marine environments. Its passive cooling contributes to its reliability and silent operation. It can be installed in vertical or horizontal position, offering flexible integration. The distributor is compatible with an input voltage range of 5 to 31 Vdc and is equipped with an LED operating indicator. It is designed for low power dissipation and maintenance-free use across a wide range of ambient temperatures. The PDF documentation is included to facilitate implementation.\n\u003c\/p\u003e","brand":"Quick","offers":[{"title":"Default Title","offer_id":53723755282772,"sku":"RC162","price":210.77,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/capture_doc1_afb95317-9f7d-42d9-90a5-9a42c49f4bf2.png?v=1779963021"},{"product_id":"blue-sea-relais-charge-automatique-ml-acr-12v-500a","title":"Automatic charge relay ML-ACR with manual control - 12 V DC 500 A","description":"\u003cp\u003e\n    Designed for managing high-demand battery systems, the \u003cstrong\u003eML-ACR 7622B-BSS\u003c\/strong\u003e automatic charge relay from BLUE SEA is a robust solution for 12V DC installations. This relay uses Magnetic Latching (ML) technology to automatically combine and isolate battery banks, ensuring efficient charge distribution with very low current consumption in ON or OFF state.\u003cbr\u003e\n\u003c\/p\u003e\n\n\u003ch3\u003eTechnical performance and features\u003c\/h3\u003e\n\u003cp\u003e\n    With a continuous capacity of 500A, an intermittent capacity of 700A (for 5 minutes), and a starting capacity of 1450A (for 30 seconds), the ML-ACR 7622B-BSS is suited for high-efficiency alternators and large battery banks. It includes advanced isolation features, such as the Start Isolation (SI) function to protect sensitive electronics from service loads during engine start, and the Engine Isolation (EI) function to isolate two engines in operation, optimizing alternator output. Unlike models like the M-ACR (65A) or the SI-ACR (120A), the ML-ACR 500A is sized for applications requiring significantly higher current management.\u003cbr\u003e\n    This relay features dual-bank battery load detection and can be manually controlled via a supplied switch for emergency or maintenance situations. The silver-alloy contacts ensure high reliability for switching loads under load, and the 3\/8\"-16 (M10) tinned copper studs provide maximum conductivity and corrosion resistance. Its design complies with ISO 8846 and SAE J1171 ignition protection requirements and is IP66 certified, allowing installation in engine compartments of gasoline-powered boats. This model is optimized for AGM\/GEL batteries, differing from the ML-ACR Li-Ion version designed specifically for lithium battery systems.\u003cbr\u003e\n\u003c\/p\u003e\n\n\u003ch3\u003eIntegration and reliability\u003c\/h3\u003e\n\u003cp\u003e\n    The \u003cstrong\u003eML-ACR 7622B-BSS\u003c\/strong\u003e relay is equipped with a Contura remote control switch (PN 2146) with integrated LED, providing visual indication of the relay’s status (combined, isolated, voltage lock, start isolation, or engine isolation). Its current consumption is less than 40mA in continuous operation and under 7.0A during state changes, minimizing parasitic discharge. It is designed for 100,000 switching cycles, ensuring long-term durability in demanding marine environments. To achieve its maximum rated capacities, it requires wiring of 2x 4\/0 AWG (2x 120 mm²).\u003cbr\u003e\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"12 V \/ With","offer_id":53723787985236,"sku":"7622B-BSS","price":204.56,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_Relais_de_charge_automatique_ML-ACR_avec_controle_manuel_-_12V_DC_500A_7622B-BSS_-_Ref_c3ed6312.jpg?v=1779201660"},{"product_id":"blue-sea-m-series-relais-charge-automatique-12-24v-65a","title":"Automatic charge relay series m - 12\/24 V DC 65 A","description":"\u003cp\u003e\n    Designed for automatic management of dual-battery bank systems, the Blue Sea m-Series 7601 Automatic Charging Relay (ACR) ensures efficient power distribution for 12V DC or 24V DC installations. This model is ideal for motorboats, recreational vehicles, and off-grid power systems requiring a continuous charge capacity of up to 65 amperes and 115 amperes intermittent (5 minutes).\n\u003c\/p\u003e\n\u003ch3\u003eFeatures and technical performance\u003c\/h3\u003e\n\u003cp\u003e\n    The m-Series 7601 automatically combines batteries during charging and isolates them during discharge or shutdown, optimizing power availability and protecting the starter battery. With dual-sensing capability, it detects a load on either battery bank. It includes a Start Isolation (SI) function that safeguards sensitive electronic equipment from voltage drops and spikes during engine start-up. Compared to traditional diode-based battery isolators, ACRs like the 7601 offer superior efficiency, generating less heat and consuming minimal charge energy.\n\u003c\/p\u003e\n\u003ch3\u003eSafety and installation\u003c\/h3\u003e\n\u003cp\u003e\n    This relay is flame-resistant, compliant with external ignition protection requirements per ISO 8846 and SAE J1171, making it safe for installation on gasoline-powered boats. Its IP67 rating ensures protection against temporary immersion up to 1 meter for 30 minutes. Voltage thresholds for combining are 13.6V DC (30 sec) or 13.0V DC (2 min) for 12V systems, and 27.2V DC (30 sec) or 26.0V DC (2 min) for 24V systems. Isolation occurs at 12.75V DC (30 sec) or 12.35V DC (10 sec) for 12V systems. It features 1\/4\"-20 (M6) stud terminals and accepts cables up to 1\/0 AWG, with a recommended size of 6 AWG (16 mm²) to meet nominal current ratings. An integrated LED indicator provides visual status updates on ACR modes, including charging, isolation, undervoltage, and fault conditions. A removable insulating cover and a 1\/4\" x .032\" quick-connect ground terminal are included to simplify installation and protect terminals.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":55861152186708,"sku":"7601-BSS","price":80.36,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_m-Series_Automatic_Charging_Relay_-_12_24V_DC_65A_7601-BSS_-_Ref_ed014392.jpg?v=1779203402"},{"product_id":"blue-sea-si-acr-relais-charge-automatique-120a-12-24v","title":"Automatic charge relay SI-ACR - 12\/24 V DC 120 A","description":"\u003cp\u003eThe BLUE SEA SI-ACR (Automatic Charging Relay) 7610-BSS is designed to optimize the management of dual battery systems aboard vessels. This 120A automatic charging relay, compatible with 12\/24V DC, combines batteries during charging and isolates them during discharge or engine start. This feature protects batteries and sensitive electronic equipment from voltage fluctuations.\u003c\/p\u003e\n\n\u003ch3\u003eIntelligent energy management\u003c\/h3\u003e\n\u003cp\u003eThe SI-ACR 7610-BSS features dual sensing, capable of detecting a charging source on either battery bank, ensuring efficient power distribution. It includes a start isolation function that temporarily disconnects service loads from the starting circuit. This prevents voltage drops and spikes that could affect electronic devices. This characteristic differentiates it from other Blue Sea ACR models, such as the 7611, which offers auxiliary battery priority or starting assistance functions, by providing specific protection for sensitive electronic systems.\u003c\/p\u003e\n\n\u003ch3\u003eRobust and secure design\u003c\/h3\u003e\n\u003cp\u003eWith a continuous capacity of 120 amperes and an intermittent capacity of 210 amperes (5 minutes), this relay is suitable for high-power alternators. Its design complies with marine standards, being \u003ca href=\"https:\/\/www.bluesea.com\/resources\/regulatory_compliance\"\u003eIP67 certified\u003c\/a\u003e for temporary immersion up to 1 meter for 30 minutes, allowing installation in damp environments or engine compartments. It is also ignition protected according to UL 1500, SAE J1171, and ISO 8846 standards, making it safe for gasoline-powered boats. The unit features overvoltage protection (16.0V DC for 12V systems) and undervoltage protection (9.5V DC for 12V systems), ensuring stable operation and battery longevity.\u003c\/p\u003e\n\n\u003ch3\u003eIntegration and monitoring\u003c\/h3\u003e\n\u003cp\u003eThe SI-ACR 7610-BSS facilitates integration into existing electrical systems with its 3\/8\"-16 (M10) stud terminals and cable routing options via side and bottom ports. An integrated LED indicator provides clear visual feedback on the relay status (combined, isolated, start isolation, voltage lockout). A remote LED output is also available for remote monitoring. This model positions itself as an advanced charging management solution for systems requiring enhanced protection of onboard electronic equipment, compared to simpler relays or traditional battery isolators.","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":55861152809300,"sku":"7610-BSS","price":111.53,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_SI-ACR_Automatic_Charging_Relay_-_12_24V_DC_120A_7610-BSS_-_Ref_6877451d.jpg?v=1779203423"},{"product_id":"blue-sea-batterylink-relais-charge-automatique-12v-24v-120a","title":"BatteryLink™ automatic charge relay - 12\/24 V DC 120 A","description":"\u003cp\u003e\n    The BLUE SEA BatteryLink™ 7611 automatic charging relay is designed to optimize battery management in 12V\/24V DC systems. With a continuous capacity of 120A, it is suitable for high-efficiency alternators, ensuring automatic combining and isolation of starting and auxiliary batteries. This device allows a single charging source to be shared, ensuring both battery banks receive adequate charge without manual intervention.\n\u003c\/p\u003e\n\u003ch3\u003eAdvanced charging technology and robustness\u003c\/h3\u003e\n\u003cp\u003e\n    The BatteryLink™ 7611 features dual-sense design that monitors charging sources on both battery banks, optimizing the charging process efficiency. It outperforms traditional battery isolators with a voltage drop ten times lower, resulting in batteries that stay significantly more charged. Its fully sealed and rugged construction ensures reliability in harsh marine environments exposed to vibration and moisture, as evidenced by its IP67 certification (immersion protection up to 1 meter for 30 minutes). The relay is also CE, ISO 8846, UL 1500, and SAE J1171 marked for protection against external ignition.\n\u003c\/p\u003e\n\u003ch3\u003eSpecific features and integration\u003c\/h3\u003e\n\u003cp\u003e\n    This relay offers an optional auxiliary battery priority function that keeps combined batteries charged longer (up to 12.25V for 12V systems or 24.5V for 24V systems) while the engine is running. This allows extended use of auxiliary loads without risking starting battery discharge. The BatteryLink™ 7611 is equipped with robust 3\/8\"-16 (M10) terminals and quick-connect terminals for ground and optional functions, simplifying installation. An integrated LED indicator provides clear relay status, with an optional remote LED output for visual control at a distance. This model serves as an efficient mid-range solution compared to the 7601 (65A\/115A) for moderate to high charging needs, and below the 7620 and 7622 models (500A\/700A) designed for very high-power systems.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":55861153497428,"sku":"7611-BSS","price":99.2,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_BatteryLink_Automatic_Charging_Relay_-_12V_24V_DC_120A_7611-BSS_-_Ref_edc9a27a.jpg?v=1779203448"},{"product_id":"blue-sea-ml-acr-relais-charge-automatique-500a-12v","title":"Automatic charge relay ML-ACR - 12 V DC 500 A","description":"\u003cp\u003e\n    Designed for demanding marine and automotive applications, the BLUE SEA (PN 7620) ML-ACR 12V DC 500A automatic charging relay is a robust energy management solution for dual-battery bank systems. Positioned as one of the high-power solutions in the ML-Series, it stands out from more compact models like the M-ACR (65A continuous) or the SI-ACR (120A continuous) by its ability to handle high-efficiency alternators and large battery banks. Its Magnetic Latching (ML) technology ensures very low current draw in both ON and OFF states, with only moderate draw during state changes, thereby optimizing battery life.\n\u003c\/p\u003e\n\n\u003ch3\u003eAutomatic management and advanced isolation features\u003c\/h3\u003e\n\u003cp\u003e\n    The ML-ACR 500A automatically combines batteries during charging and isolates them when no charge is detected. It can detect charge on both battery banks, ensuring efficient management. This model offers configurable isolation functions: Start Isolation (SI) temporarily protects house loads from engine circuit voltage drops and spikes during startup, preventing damage. Engine Isolation (EI) allows isolation of two running engines to protect their electronics and maximize alternator output. These features are critical for protecting sensitive onboard electronics. The relay can also be used to couple battery banks in emergency start situations. For lithium battery systems, the ML-ACR Li-Ion version is specifically designed, while this standard model is optimized for AGM\/GEL to AGM\/GEL or AGM\/GEL to lithium configurations.\n\u003c\/p\u003e\n\n\u003ch3\u003eDesign and control\u003c\/h3\u003e\n\u003cp\u003e\n    With a continuous current rating of 500A, an intermittent capacity of 700A (5 minutes), and a starting capacity of 1450A (30 seconds), this relay is built for high performance. It features 3\/8\"-16 tinned copper studs for maximum conductivity and corrosion resistance, and silver alloy contacts for high reliability when switching loads under voltage. A Contura remote control switch (PN 2146) is typically included, providing manual control with or without power and a \"LOCK OFF\" function for maintenance. A remote LED output indicates relay status (combined, isolated, voltage lockout, or SI\/EI isolation). Its dimensions are approximately 13.65 cm long x 9.53 cm wide x 5.08 cm high, and it meets CE, ISO 8846, and SAE J1171 standards for external ignition protection, with an IP66 rating.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"12 V \/ Without","offer_id":55861154677076,"sku":"7620-BSS","price":247.57,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_ML-ACR_Automatic_Charging_Relay_-_12V_DC_500A_7620-BSS_-_Ref_09eee2e2.jpg?v=1779203494"},{"product_id":"blue-sea-ml-acr-relais-charge-automatique-24v-500a-manuel","title":"Automatic charge relay ML-ACR with manual control - 24 V DC 500 A","description":"\u003cp\u003e\n    Designed for demanding marine electrical systems, the BLUE SEA ML-ACR 7623-BSS 24V DC automatic charge relay (ACR) provides intelligent management of dual battery banks. With a continuous rating of 500A, 700A intermittent (5 minutes), and 1450A inrush (30 seconds), it ensures reliable power distribution for high-output alternators and large battery banks.\n\u003c\/p\u003e\n\u003ch3\u003eAdvanced Technology for Optimal Management\u003c\/h3\u003e\n\u003cp\u003e\n    The ML-ACR features Magnetic Latch (ML) technology, delivering extremely low current draw (\u0026lt;13mA continuous, \u0026lt;7.0A during state change), maximizing battery autonomy. It automatically combines batteries when charging voltage exceeds 27.0V for 30 seconds (or 26.0V for 90 seconds) and isolates them if voltage drops below 24.7V for 10 seconds (or 25.5V for 30 seconds), or in case of undervoltage (\u0026lt;19.2V) or overvoltage (\u0026gt;32.4V) to protect the system.\n\u003c\/p\u003e\n\u003ch3\u003eSafety and Flexibility Features\u003c\/h3\u003e\n\u003cp\u003e\n    This model includes manual control via a remote Contura switch (PN 2146 included), providing additional safety and manual override capability even without power. Start Isolation (SI) functions protect sensitive electronics from voltage spikes during engine start, while Engine Isolation (EI) allows isolation of two running engines to optimize alternator output. A remote LED indicator provides clear system status (combined, isolated, locked, isolation).\n\u003c\/p\u003e\n\u003ch3\u003eRugged and Marine-Grade Construction\u003c\/h3\u003e\n\u003cp\u003e\n    The BLUE SEA ML-ACR is built with 3\/8\"-16 (M10) tinned copper studs for maximum conductivity and corrosion resistance, and silver-alloy contacts for high reliability during load switching. It is IP66, CE certified and meets ISO 8846 ignition protection and SAE J1171 requirements, allowing safe installation in gasoline engine compartments. With 100,000 switching cycles, it is designed for long-term durability in extreme conditions. This model outperforms BLUE SEA’s M-ACR (65A) and SI-ACR (120A) series and differs from the ML-ACR Li-Ion version by being optimized for lead-acid\/AGM\/GEL batteries.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"24 V \/ With","offer_id":55861156446548,"sku":"7623-BSS","price":251.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_ML-ACR_Automatic_Charging_Relay_with_Manual_Control_-_24V_DC_500A_7623-BSS_-_Ref_fa1b1122.jpg?v=1779203534"},{"product_id":"blue-sea-mini-add-a-battery-kit-65a-relais-charge-automatique","title":"Mini battery add-on kit - 65 A","description":"\u003cp\u003e\n    Designed for dual battery systems, the \u003cstrong\u003eBlue Sea 7649-BSS Mini Add-A-Battery Kit\u003c\/strong\u003e simplifies charge management for alternators up to 65A. It includes an m-Series 7601 automatic charging relay (ACR) and an m-Series 6011 Dual Circuit Plus™ battery switch. This system enables automatic battery combining during charging and isolation during discharge, protecting the starter battery.\n\u003c\/p\u003e\n\n\u003ch3\u003eAutomated power management\u003c\/h3\u003e\n\u003cp\u003e\n    The m-Series 7601 automatic charging relay (ACR) provides intelligent management of both battery banks. It automatically combines batteries when one receives a charge and isolates them during discharge or engine start. This function protects sensitive electronic equipment from voltage drops via the Start Isolation (SI) option. The relay has a continuous capacity of 65A and an intermittent capacity of 115A (5 min), compatible with 12V or 24V DC systems. Its closing voltages are 13.6V (30 sec) or 13.0V (2 min) for 12V, and 27.2V (30 sec) or 26.0V (2 min) for 24V. Opening thresholds are 12.35V (10 sec) or 12.75V (30 sec) for 12V, and 24.7V (10 sec) or 25.5V (30 sec) for 24V. It also includes overvoltage protection (16.0V DC) and undervoltage protection (9.5V DC for 12V, 19.0V DC for 24V).\n\u003c\/p\u003e\n\n\u003ch3\u003eSystem safety and flexibility\u003c\/h3\u003e\n\u003cp\u003e\n    The m-Series 6011 Dual Circuit Plus™ battery switch allows simultaneous switching of two battery banks with a single ON\/OFF switch while maintaining bank isolation. It features a \"COMBINE BATTERIES\" function for emergency engine starts in case of a weak battery. This switch is rated for 300A continuous per circuit, 450A intermittent (5 min), and 675A cranking current (30 sec) per circuit, with a maximum voltage of 32V DC. Tinned copper stud terminals ensure maximum conductivity and corrosion resistance, accepting M10 (3\/8\") lugs. The entire kit is rated IP66\/IP67, providing protection against powerful water jets and temporary immersion up to 1 meter for 30 minutes, and is ignition-protected per ISO 8846 and SAE J1171 standards, making it safe for gasoline engine installations on boats.\n\u003c\/p\u003e\n\n\u003ch3\u003ePositioning and applications\u003c\/h3\u003e\n\u003cp\u003e\n    This \u003cstrong\u003eBlue Sea 7649-BSS Mini Add-A-Battery Kit\u003c\/strong\u003e is optimized for small boats, outboards, recreational vehicles, and off-grid solar installations requiring alternator management up to 65A. For systems with higher-power alternators, up to 120A, Blue Sea offers the Add-A-Battery 7650 kit, which uses an SI-ACR 7610 relay and an E-Series 5511E battery switch, providing higher capacity for greater power needs. The 7649-BSS is ideal for simple and efficient dual-battery setups, with versatile mounting options (surface, front or rear panel) and a removable button for security.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":55861158642004,"sku":"7649-BSS","price":129.56,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_Mini_Add-A-Battery_Kit_-_65A_7649-BSS_-_Ref_5bc05b96.jpg?v=1779203565"},{"product_id":"blue-sea-add-a-battery-kit-gestion-batterie-120a","title":"Battery add-on kit - 120 A","description":"\u003cp\u003e\n    The \u003cstrong\u003eBLUE SEA Add-A-Battery 120A\u003c\/strong\u003e kit (part number 7650-BSS) is an integrated solution designed to simplify the management and automation of charging two separate battery banks, typically a starter battery bank and a house bank, from a single charging source. Intended for marine applications, recreational vehicles, and standalone systems, this kit provides reliable electrical management without manual intervention.\n\u003c\/p\u003e\n\u003ch3\u003eDual Circuit Plus™ e-Series Battery Switch\u003c\/h3\u003e\n\u003cp\u003e\n    At the core of this system is the Dual Circuit Plus™ e-Series battery switch. This component isolates the starter and house battery banks and allows manual combination for emergency starting. It offers multiple switching positions for managing both banks while maintaining isolation to minimize the risk of draining the starter battery. It can handle continuous current of 350 amps per circuit, intermittent current of 525 amps (5 minutes), and starting current of 700 amps (30 seconds). Its maximum operating voltage is 32 volts DC. For optimal conductivity and corrosion resistance, the terminal studs are made of tinned copper. The switch complies with ABYC requirements for battery switches and is rated IP66, ensuring protection against powerful water jets. It also meets CE, UL 1500, and SAE J1171 standards for ignition protection.\n\u003c\/p\u003e\n\u003ch3\u003eAutomatic Charging Relay (SI-ACR) 120A\u003c\/h3\u003e\n\u003cp\u003e\n    The kit includes a 120-amp automatic charging relay (SI-ACR). This relay automatically combines batteries during charging and isolates them during discharge or when the engine is not charging, optimizing load sharing between the two banks without requiring regulator adjustment. Its rated capacity is 120 amps continuous and 210 amps intermittent (5 minutes). It is compatible with 12V or 24V DC systems. The ACR features a Start Isolation function that protects sensitive electronics from voltage drops and spikes during engine start-up. An under-voltage lockout function prevents combination if the voltage of a battery is below 9.5V (12V system) or 19V (24V system). The relay has an IP67 rating, making it resistant to temporary immersion up to one meter, and is certified to CE, ISO 8846, UL 1500, and SAE J1171 standards for ignition protection. An LED indicator provides a visual diagnostic of voltage status and relay function.\n\u003c\/p\u003e\n\u003ch3\u003ePositioning and Integration\u003c\/h3\u003e\n\u003cp\u003e\n    The \u003cstrong\u003eBLUE SEA Add-A-Battery 120A\u003c\/strong\u003e kit is positioned as a robust solution for alternators up to 120 amps. It outperforms the Mini Add-A-Battery 7649 version (for alternators up to 65A) in terms of current capacity, making it suitable for more demanding marine engines and electrical systems. The kit ensures efficient energy management, protection of electronic equipment, and the ability to combine batteries for emergency starting when needed. The M10 (3\/8\"-16) terminal studs on both components facilitate robust and standardized connections.\n\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":55861159264596,"sku":"7650-BSS","price":168.07,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_Add-A-Battery_Kit_-_120A_7650-BSS_-_Ref_09f4baaf.jpg?v=1779203588"},{"product_id":"blue-sea-relais-charge-ml-acr-500a","title":"ML-ACR 500 A Charge Relay","description":"\u003cp\u003eThis sheet groups Blue Sea Systems variants from the same range for quick comparison of voltage and manual control without multiplying product pages.\u003c\/p\u003e\n\u003cp\u003eSelect the variant suited to your installation: the child product retains its own price, images, and specifications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSkysat tip:\u003c\/strong\u003e verify the rating, voltage, number of circuits, or exact configuration before ordering, especially for an existing marine electrical installation.\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"12 V \/ Without","offer_id":55861154677076,"sku":"7620-BSS","price":247.57,"currency_code":"EUR","in_stock":true},{"title":"12 V \/ With","offer_id":53723787985236,"sku":"7622B-BSS","price":204.56,"currency_code":"EUR","in_stock":true},{"title":"24 V \/ With","offer_id":55861156446548,"sku":"7623-BSS","price":251.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/files\/01_-_Hero_-_BLUE_SEA_ML-ACR_Automatic_Charging_Relay_-_12V_DC_500A_7620-BSS_-_Ref_09eee2e2.jpg?v=1779203494"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3274\/4788\/collections\/blue_sea_ml-acr.png?v=1779960296","url":"https:\/\/skysat.fr\/en-us\/collections\/battery-charge-relay.oembed","provider":"Skysat","version":"1.0","type":"link"}