Blue Sea 7623-BSS ML-ACR Automatic Charging Relay with Manual Control – 24V DC 500A

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

Specifications
Control Circuit Connection	Tinned Wire
Nominal Voltage	24V 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 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

Wiring Diagram
Instructions
Dimension Drawing

Additional information