7620100 ML ACR Charging Relay 12V 500A with Deutsch Connector
500 Amp 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: Deutsch DTM
- Nominal Voltage: 12VDC
- Manual Control: No
- Engine Isolation: Yes
- Mounting: 10
- Start Assist: Yes
- Start Isolation: Yes
- 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 Seconds: 1450A DC
- Cable Size to Meet Ratings: 2x (4/0)
- Live Current Switching: 300A@12VDC
- Master Control Switch Capability: No
- Switching Cycles: 100,000
- Terminal Ring Diameter Clearance: 1.18″ (29.97 mm)
- Terminal Stud Length: 1.50″ (38.1 mm)
- Terminal Stud Size: 3/8″ – 16 (M10)
WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.

![T-H Marine 27 Series Battery Holder Tray w/Stainless Buckled Strap [NBH-27-SSC-DP]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/t-h-marine-27-series-battery-holder-tray-w-stainless-buckled-strap-nbh-27-ssc-dp.webp)
![Blue Sea 7702100 ML Solenoid 24V 500A w/Manual ControlDeutsch Connector [7702100]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/blue-sea-7702100-ml-solenoid-24v-500a-w-manual-controldeutsch-connector-7702100.webp)
![Egis Mini On/Off Battery Switch 701 [2701]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/egis-mini-on-off-battery-switch-701-2701.webp)
![Blue Sea 7719100 - ML-Series Solenoid Switch - Deutsch Connector - 24V[7719100]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/blue-sea-7719100-ml-series-solenoid-switch-deutsch-connector-24v-7719100.webp)
![Blue Sea 7719 - ML-Series Solenoid Switch - Stripped Wire - 24V[7719]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/blue-sea-7719-ml-series-solenoid-switch-stripped-wire-24v-7719.webp)
![Blue Sea 7621100 ML ACR Charging Relay 24V 500A w/Deutsch Connector [7621100]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/blue-sea-7621100-ml-acr-charging-relay-24v-500a-w-deutsch-connector-7621100.webp)
![Blue Sea 7623100 ML ACR Charging Relay 24V 500A w/Manual ControlDeutsch Connector [7623100]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/blue-sea-7623100-ml-acr-charging-relay-24v-500a-w-manual-controldeutsch-connecto.webp)
![Blue Sea 7718100 - ML-Series Solenoid Switch - Deutsch Connector - 12V[7718100]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/blue-sea-7718100-ml-series-solenoid-switch-deutsch-connector-12v-7718100.webp)