Blue Sea 7620 – ML-ACR Automatic Charging Relay 12V DC 500A with Remote Control Switch

ID 1001823

$ 418.86

1-2 weeks delivery time

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The Blue Sea 7620 ML-ACR Automatic Charging Relay is a 12V DC magnetic latching (bi-stable) relay rated 500A continuous, 700A (5 min) and 1450A cranking (30 sec) for automatic combining and isolation of two large battery banks. It features dual sensing, start isolation, engine isolation, start assist, and low standby draw (13mA, <40mA monitor). The unit uses 3/8"-16 (M10) tinned copper studs with 1.50" length, supports 4/0 AWG x2 cable, and includes SPDT Remote Control Contura Switch PN 2146. Operating range −10°C to +60°C, live current switching up to 300A @ 12V DC, weight 2.04 lb.

Description
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Blue Sea 7620 – ML-ACR Automatic Charging Relay 12V DC 500A with Remote Control Switch

The Blue Sea 7620 ML-ACR Automatic Charging Relay is a 12V DC magnetic latching (bi-stable) relay designed to automatically combine batteries during charging and isolate them during discharge and engine starting. It is rated for high current systems and supports automatic management of two large battery banks.

The ML (Magnetic Latch) design provides very low holding current draw and only draws moderate current for a very short time when changing state. The unit supports dual sensing, start isolation, engine isolation, and emergency start assist functions. A remote control Contura switch (PN 2146) is included.

Key Features

Magnetic latching (bi-stable) Automatic Charging Relay
Automatically combines batteries during charging and isolates when discharging
500A continuous rating for high-output alternators
Dual sensing on both battery banks
Emergency paralleling for engine starting
Start Isolation (SI) to protect sensitive electronics during cranking
Engine Isolation (EI) to isolate two engines while running
Very low current draw in ON/OFF states
LED output for remote status indication
Silver alloy contacts for switching live loads
Label recesses for circuit identification

Included

Qty	PN	Description
1	2146	SPDT Remote Control Contura Switch – ON-OFF-ON

Electrical Ratings

Nominal Voltage	12V DC
Continuous Rating	500A
Intermittent Rating	700A (5 min)
Cranking Rating	1450A DC (30 sec)
Live Current Switching	300A @ 12V DC
Operating Current	13 mA
Operating Current (state change)	< 7.0 A

Voltage Thresholds

Combine (30 sec)	13.5V
Combine (90 sec)	13.0V
Open (10 sec)	12.35V
Open (30 sec)	12.75V
Open High	16.2V

Isolation & Assist Functions

Start Isolation: relay open during engine starting to protect electronics
Engine Isolation: isolates engine start batteries when two engines are running
Start Assist: relay closed during engine starting to combine batteries if required

Connections & Mounting

Terminal Stud Size	3/8"-16 (M10)
Stud Length	1.50 in (38.1 mm)
Stud Material	Tinned Copper
Terminal Ring Clearance	1.12 in (28.45 mm)
Terminal Torque	140 in-lb (15.82 Nm)
Cable Size to Meet Ratings	4/0 AWG x 2
Wire Size (control)	20 AWG
Control Circuit Connection	Tinned wire
Mounting	#10