Blue Sea 7622 ML-ACR Automatic Charging Relay with Manual Control 12V DC 500AView all products in Battery Switches

Binnacle.com #:  25236
Blue Sea 7622 ML-ACR Automatic Charging Relay with Manual Control 12V DC 500A

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500 Amp Charging Relay automatically combines batteries during charging, and isolates batteries when discharging and when starting the engine, which prevents line drop.
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Binnacle.com:   #25236
Brand:  Blue Sea Systems
MFG Part#:   7622
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Blue Sea 7622 ML-ACR Automatic Charging Relay with Manual Control - 12V DC 500A

A 500 Amp Magnetic Latching (bi-stable) Charging Relay automatically combines batteries during charging and isolates the batteries when discharging, and when starting the 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 a 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
The ML-ACR (Automatic Charging Relay) and ML-RBS (Remote Battery Switch), when paired, offer complete battery management of large battery banks with the push of a button.

In addition to automatically sharing the charge from an engine's alternator between the start and auxiliary battery, the ML-ACR control switch provides momentary battery combining to assist with starting in the event of a low engine battery.

Multiple remote battery switches can be easily connected to the ML-ACR with the optional Paralleling Link Bus for a complete remote battery management Subsystem.


  Blue Sea 7622 ML– ACR Automatic Charging Relay with Manual Control Manual

  Blue Sea 7622 ML-ACR Wiring Diagram

  Blue Sea ML-ACR Diagnostic Chart

  Blue Sea ML-ACR Brochure

BS7622 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
Amperage Operating Current when changing state <7.0A
Terminal Stud Torque 140 in-lb (15.82 Nm)
Continuous Rating  500A
Intermittent Rating 700A (5 min)
Cranking Rating 10 sec 2500A
Cranking Rating 1 min  1100A
Cable Size to Meet Ratings 4/0 AWG x 2
Live Current Switching 300A @ 12V DC
Switching Cycles 100000
Terminal Ring Diameter Clearance 1.12in (28.45 mm)
Terminal Stud Length 1.50in (38.1 mm)
Terminal Stud Size 3/8" - 16 (M10)
Wire Size 20 AWG
Relay Contact Position  
Combine 30 sec 13.5V
Combine 90 sec 13.0V
Open 10 sec 12.35V
Open 30 sec 12.75V
Open High 16.2V
Weight 2.06lb (0.93 kg)

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Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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