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Blue Sea Systems

Blue Sea Systems 7620 ML-ACR 12V 500A Relay

Blue Sea Systems 7620 ML-ACR 12V 500A Relay

$ 329.56 USD
$ 257.99 USD $ 329.56 USD
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Blue Sea Systems ML-ACR 12V DC 500A Automatic Charging Relay (7620-BSS / 7620)

The Blue Sea Systems 7620-BSS (Catalog SKU: 7620) is a heavy-duty 500A Magnetic Latching Automatic Charging Relay (ML-ACR) designed for dual-battery management in high-demand 12 V DC marine, RV, and commercial vehicle electrical systems. It automatically combines two independent battery banks (such as Start and House banks) during charging cycles and isolates them under discharge or when starting engines to preserve cranking power.

Built on a bi-stable magnetic latching mechanism, the unit draws negligible operating current (<13 mA) in either the open or closed state. The ML-ACR supports Start Isolation (SI) and Engine Isolation (EI) modes to protect sensitive marine electronics from voltage sags during engine cranking. It includes a remote Contura control switch (PN 2146) for manual override control and live status indication directly from the helm or dashboard.


500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine
  • 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
Specifications
Control Circuit Connection  Tinned Wire
Nominal Voltage 12V DC
Manual Control  No
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 30 sec  1450A DC
Minimum Operating Temperature -10° C
Maximum Operating Temperature 60° C
Cable Size to Meet Ratings 4/0 AWG x 2
Live Current Switching 300A @ 12V DC
Stud Material Tinned Copper
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 2.04lb (0.93 kg)

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