Blue Sea Systems
Blue Sea SI-ACR 7610 wiring diagram
Connect two battery banks with the Blue Sea SI-ACR 7610. See both fused positive paths and its small control-ground connection, then adapt the example to your charging system.
- Compatible systems
- 12 V / 24 V
Connection essentials
One bank on each stud
A and B are interchangeable. Protect the positive cable at each battery.
Give GND its own fuse
Connect GND to common DC negative through a 1 A fuse. Keep load returns on the negative bus.
Plan starting separately
This relay must not carry engine-starting current. Optional SI and LED wiring are outside this example.
Wiring diagram
How the SI-ACR 7610 is wired.
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Two 12 V AGM placeholder banks share a negative bus. Each positive reaches a separate ACR stud through its own 175 A fuse and 50 mm² cable. These conservative example choices use the manual's up-to-120 A table, not a prediction of bank-to-bank current. GND has the required 1 A inline fuse. Replace placeholder bank limits and verify fuse type, location and charging source. In Simulate, select Combined or Isolated manually; automatic timing and equalization current are not predicted. Manufacturer installation manual
Edit this wiring exampleCable sizing for this example
Two placeholder AGM banks share a negative bus. Crimp selects Combined or Isolated manually; it does not predict equalization current.
Cable sizes depend on the connected equipment, current and cable lengths. Add those details in Crimp to size each run.
Installation notes
Before you install.
Open a question for model-specific guidance and sources.
Verified against the manufacturer's documentation (rev. 990170140 Rev.011), checked 2026-09-16. Manufacturer documentation →
Where do the two batteries and GND connect?
Each battery positive goes to one large stud; GND is a separate small control connection. Follow the Blue Sea 7610 installation diagram:
- A and B: one bank on each stud, with a fuse at each battery. The studs are interchangeable.
- Common negative: connect the battery returns to the system's negative bus.
- GND: connect to common DC negative through its own 1 A inline fuse. It is not a load-return terminal.
Does the SI-ACR charge the batteries or limit current?
It joins banks during charging and isolates them when appropriate; it does not regulate charging current. Its 120 A continuous rating describes the relay contacts. Current depends on the surrounding batteries, charging sources and wiring.
For controlled battery-to-battery charging, compare the Orion XS. The ML-ACR 7622 is also a different product.
What do the example's cable and fuse sizes cover?
The example has two 12 V AGM placeholder banks and a shared negative bus. Each 1 m ACR positive lead uses 50 mm² cable and a 175 A fuse, meeting both manufacturer tables for up to 120 A. The control-ground lead has its separate 1 A fuse. See the wire and fuse tables.
Replace the banks and their assumed limits, then add your charging source and loads. These sizes do not predict bank-equalization current. Check protection location, interruption capacity and disconnects for the completed circuit.
Does the example include engine-starting and automatic switching?
The 7610 must not carry engine-starting current. An emergency-start arrangement needs a suitable separate switching path. The optional start-isolation (SI) and remote LED leads are outside this example; use Blue Sea's full installation diagram.
In Crimp, select Combined or Isolated in Simulate to inspect a chosen contact state. The real relay senses voltage automatically; Crimp does not simulate its thresholds, delays or equalization transients.
Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
12/24 V dual-sensing automatic charging relay, 120 A continuous. Connects two battery banks during charging; it is not a charger or an emergency-starting path. GND requires a 1 A fused connection. Simulate selects combined or isolated contacts manually; voltage thresholds, delays, optional SI and remote LED wiring are not modeled.
- Compatible systems
- 12 V / 24 V
Terminal map
A and B are interchangeable battery-positive studs. GND is the small control return, not a load-return bus. Optional start-isolation (SI) and remote LED leads are omitted; follow the manufacturer diagram for them. The relay must not carry engine-starting current. A 120 A contact rating does not mean the relay limits charging current to 120 A.
A
positive · bidi
B
positive · bidi
GND (1A fused)
negative · input
Sources and sizing method
Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.
Example sizing. Cable labels apply to the connected example, not a fixed cable size for this component. Set your actual equipment, current, lengths and installation conditions in Crimp before choosing hardware.
Read how the sizing worksNext step
Plan your installation with SI-ACR 7610.
Open this example as a new project, or add this component to your existing diagram. Use your equipment and cable lengths to review the sizing.
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