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
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	27.0V
Combine 90 sec	26.0V
Open 10 sec	24.7V
Open 30 sec	25.5V
Open High	32.4V

 

 

Dimensions

 

 

 

 

Wiring Diagram

 

 

 

 

 

 

• BS-7623_Installation_Instructions.pdf
• BS-7623_FAQ.pdf