Blue Sea ML-ACR-Series Automatic Charging Relay with Manual Control - 12V (500A)

ML-ACR Automatic Charging Relay with Manual Control is 500 A magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine.

Features

• Senses charging on two battery banks
• Automatically manages the charging of two large battery banks
• Allows paralleling of battery banks for emergency starting
• 500 A continuous rating to support high-output alternators
• Dual sensing - senses charge on both battery banks
• Label recesses for circuit identification
• 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" (22 mm) stud length accepts multiple cable terminals
• Silver alloy contacts provide high reliability for switching live loads
• Magnetic latch (ML) - ACR draws very low current (<40 mA to monitor terminal voltage)
• Manual control switch provides an added level of safety allowing control with or without power, and offering LOCK OFF capability for servicing
• 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

Specifications

• Stud material: Tinned copper
• Control circuit connection: Tinned wire
• Nominal voltage: 12 V DC
• Manual control: Yes
• Engine isolation: Yes
• Mounting: #10
• Start assist: Yes
• Start isolation: Yes
• Amperage operating current: 13 mA
• Amperage operating current when changing state:
• Terminal stud torque: 15.82 N-m (140 inch-lb)
• Continuous rating: 500 A
• Intermittent rating (5 min): 700 A
• Cranking rating (30 sec): 1450 A DC
• Minimum operating temperature: -10 degree C
• Maximum operating temperature: 60 degree C
• Cable size to meet rating: 4/0 AWG x 2
• Live current switching: 300 A @ 12 V DC
• Switching cycles: 100000
• Terminal ring diameter clearance: 1.12" (28.45 mm)
• Terminal stud length: 1.50" (38.1 mm)
• Terminal stud size: 3/8" - 16 (M10)
• Wire size: 20 AWG
• Relay contact position combine (30 sec): 13.5 V
• Relay contact position combine (90 sec): 13.0 V
• Relay contact position open (10 sec): 12.35 V
• Relay contact position open (30 sec): 12.75 V
• Relay contact position open (high): 16.2 V
• Weight: 0.93 kg (2.06 lb)
• Certification: CE, IP66, ISO 8846 Marine, SAE J1428

Dimension Drawing

Wiring Diagram

Included Accessories

• SPDT Remote Control Contura Switch - ON-OFF-ON

Optional Accessories

• Remote Control Panel
• 360 Panel Blank ML-Contura Switch
• ML Series Link Bus

Remote Battery Management and ACR SubSystem

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.

Technical Files

Diagnostic Flowchart
Installation Instruction
Datasheet