Blue Sea Systems ML-ACR Automatic Charging Relay

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

Features:

• 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

Specifications:

• Control Circuit Connection : Tinned Wire or Deutsch DTM / Amphenol ATM
• Nominal Voltage: 12 or 24V 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
• Cable Size to Meet Ratings: 4/0 AWG x 2
• Live Current Switching: 300A @ 12V DC
• Switching Cycles: 100000
• Terminal Ring Diameter Clearance: 1.18" (29.97 mm)
• Terminal Stud Length: 1.50" (38.1 mm)
• Terminal Stud Size: 3/8" - 16 (M10)

Data Sheet