Blue Sea ML-ACR (Automatic Charging Relay)

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  • $275.00
  • Regular price $340.12
  • 1 available


Blue Sea's ML-ACR 12V is an automatic battery charging relay. This is the perfect product for dual battery set-ups that require the batteries to be connected for charging, but disconnected while not charging. For example, if you have your main starter battery connected to your alternator, the ML-ACR will automatically connect your second battery when there is charge being applied (ie: vehicle is running) but will automatically disconnect the batteries when there is no charge. (ie; vehicle is off, but lights or fridge are running). This isolates your starting battery from any draw while the vehicle is off. 

Additionally, the Blue Sea ML-ACR can be set to manually connect or disconnect the batteries. This is useful in the event you need to self-jump start your vehicle from your auxiliary battery. 

500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine

  • Manual control switch provides an added level of safety allowing control with or without power, and offering LOCK OFF capability for servicing
  • Includes ML-Series Remote Control Contura Switch PN 2146
  • Automatically manages the charging of two large battery banks
  • Allows paralleling of battery banks for emergency starting
  • 500 Ampere continuous rating to support high-output alternators
  • Magnetic Latch (ML)—ACR draws very low current (<40mA to monitor terminal voltage) in the "ON" or "OFF" states, and draws moderate current for very short time when changing state
  • Dual sensing—senses charge on both battery banks
  • Start Isolation (SI)—can be configured for temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics
  • Engine Isolation (EI)—can be configured for isolation of two engines while both are running to protect engine electronics and maximize alternator output
  • Senses charging on two battery banks
  • LED output to remotely indicate when batteries are combined, isolated, in voltage lockout, or in Start or Engine isolation
  • 3/8"-16 tin-plated copper studs for maximum conductivity and corrosion resistance
  • 7/8" (22mm) stud length accepts multiple cable terminals
  • Silver alloy contacts provide high reliability for switching live loads
  • Label recesses for circuit identification