Blue Sea Systems SI-ACR Automatic Charging Relay - 12/24V DC 120A
SKU BLUE-7610
- Nominal Voltage
- 12V DC; 24V DC
- Start Isolation
- Yes
- Amperage Operating Current
- 175mA (combined); 15mA (open)
- Terminal Stud Torque
- 140 in-lb (15.82 Nm)
- Continuous Rating
- 120A
- Intermittent Rating
- 210A (5 min)
- Cable Size to Meet Ratings
- 1/0 AWG
- Stud Material
- Tinned Copper
Stocked items typically ship the next business day from our US warehouse. 30-day returns on unused stocked items. Exclusions apply. Return policy · Shipping policy
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About this product
SI-ACR Automatic Charging Relay - 12/24V DC 120A. Protects sensitive electronics by temporary isolation of house loads from engine circuit during engine cranking. Designed for 12 or 24 volt systems.
Key features
- Protects sensitive electronics by temporary isolation of house loads from engine circuit during engine cranking
- Designed for 12 or 24 volt systems
- 12/24 volt auto ranging voltage input
- Hermetically sealed contacts/vaporproof
- Ignition protected—safe for installation aboard gasoline powered boats
- Supports high-output alternators up to 120 Amperes
- Dual sensing
- Start Isolation allows temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics from sags and spikes
- Remote LED remotely indicates ACR states - requires optional LED
For installation planning, check the manufacturer's ratings: nominal voltage: 12V DC; 24V DC; amperage operating current: 175mA (combined); 15mA (open); continuous rating: 120A.
Manufacturer part 7610. Confirm the circuit rating, mounting arrangement, and required accessories against the manufacturer specifications before selecting this part.
Manufacturer specifications
- Nominal Voltage
- 12V DC; 24V DC
- Start Isolation
- Yes
- Amperage Operating Current
- 175mA (combined); 15mA (open)
- Terminal Stud Torque
- 140 in-lb (15.82 Nm)
- Continuous Rating
- 120A
- Intermittent Rating
- 210A (5 min)
- Cable Size to Meet Ratings
- 1/0 AWG
- Stud Material
- Tinned Copper
- Terminal Ring Diameter Clearance
- 1.12in (28.45 mm)
- Terminal Stud Length
- 0.875in (22.23 mm)
- Terminal Stud Size
- 3/8" - 16 (M10)
- Combine 30 sec
- 13.6V @ 12 V; 27.2V @ 24 V
- Combine 90 sec
- 13.0V @ 12 V; 26.0V @ 24 V
- Open 10 sec
- 12.35V @ 12 V; 24.7V @ 24 V
- Open 30 sec
- 12.75V @ 12 V; 25.5V @ 24 V
- Open High
- 16.0V @ 12 V; 30.0V @ 24 V
- Overvoltage Lockout
- 16.0V @ 12V; 32.0V @ 24V
- Undervoltage Lockout
- 9.5V @ 12 V; 19V @ 24 V
- Weight
- 1.25lb (0.57 kg)
Product details
- Series
- SI
- Voltage
- 12V DC; 24V DC
- Amperage
- 120 A
- Function
- Charge Relay
- Device Type
- SI-Series
- Manufacturer
- Blue Sea Systems
- Product Type
- SI-Series
Shipping & returns
- Stocked items typically ship the next business day from our US warehouse.
- 30-day returns on unused stocked items. Exclusions apply. See policy
- Custom and quoted items are non-returnable once production begins.
Warranty
Backed by the original manufacturer’s warranty plus our workmanship guarantee on assembled harnesses. Contact us with your invoice and we’ll coordinate any covered repair or replacement.
Read the full warranty termsTechnical support
Need help choosing the right part?
Our marine electrical team can review your setup and recommend compatible products. Send a photo, a sketch, or your circuit list and we'll come back with a parts list that fits the boat.
Certifications & training
- ABYC-aware build practices
- OEM-grade marine wire & terminals
Additional capabilities are based on hands-on experience building marine wiring systems rather than third-party certification.
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Why buy from Common Ground Marine
- 20+ years building marine wiring harnesses, panels, and shore-power systems.
- Engineers — not a phone tree — review every custom build before parts are cut.
- OEM-grade components: tinned copper, sealed connectors, marine-rated jackets.