---
product_id: 271435958
title: "Automatic Charging Relays (ACRs)"
brand: "blue sea systems"
price: "$348.27"
currency: USD
in_stock: true
reviews_count: 6
category: "Blue Sea Systems"
url: https://www.desertcart.ec/products/271435958-automatic-charging-relays-acrs
store_origin: EC
region: Ecuador
---

# 12/24V auto-ranging voltage input 120A high-output alternator support Hermetically sealed, vaporproof contacts Automatic Charging Relays (ACRs)

**Brand:** blue sea systems
**Price:** $348.27
**Availability:** ✅ In Stock

## Summary

> ⚡ Stay Powered, Stay Ahead – The Ultimate Smart Relay for Next-Level Marine Energy

## Quick Answers

- **What is this?** Automatic Charging Relays (ACRs) by blue sea systems
- **How much does it cost?** $348.27 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/271435958-automatic-charging-relays-acrs)

## Best For

- blue sea systems enthusiasts

## Why This Product

- Trusted blue sea systems brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rugged Vaporproof Design:** Hermetically sealed contacts ensure reliable, corrosion-resistant performance even in harsh marine environments.
- • **High-Capacity Power Handling:** Supports alternators up to 120 amps, perfect for high-output systems demanding efficient charging.
- • **Ignition Protected for Safety:** Certified safe for gasoline-powered boats, giving you peace of mind on every voyage.
- • **Smart Dual Battery Management:** Automatically isolates house loads during engine cranking to protect sensitive electronics and optimize battery life.
- • **Universal Voltage Compatibility:** Seamlessly works with both 12V and 24V systems, adapting to your vessel’s power needs without manual adjustments.

## Overview

Blue Sea Systems Automatic Charging Relay (ACR) 7610 is a robust, hermetically sealed relay designed for 12/24V systems, supporting up to 120A alternators. It intelligently isolates house loads during engine cranking to protect sensitive electronics and optimize battery charging. Ignition protected and vaporproof, it’s engineered for safe, reliable use aboard gasoline-powered boats, making it a top choice for professional mariners seeking seamless dual battery management.

## Description

Blue Sea Systems Si-Acr Automatc Charging Relay - 12/24V Dc / 120A (7610) : desertcart.ae: Automotive

Review: Found at the right time - It’s fullfilled my requirements in the right time
Review: This dual sensing smart relay seamlessly pairs with my dual batteries doing the job better than what I expected. I’ve used the pilot led facility inside the cab so I can see the unit connecting and disconnecting the batteries. Highly recommend the 7610 unit fro Blue Sea and will be telling everyone about how good this product works

## Features

- Protects sensitive electronics by temporary isolation of house loads from engine circuit during engine cranking
- 12/24 volt auto ranging voltage input
- Hermetically sealed contacts/vaporproof
- Ignition protectedâsafe for installation aboard gasoline powered boats
- Supports high-output alternators up to 120 amperes

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000OTIPDQ |
| Batteries | 1 Unknown batteries required. |
| Batteries Included? | No |
| Best Sellers Rank | #3,580 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Accessory Power Relays |
| Brand | Blue Sea Systems |
| Color | No Color |
| Customer Reviews | 4.8 4.8 out of 5 stars (642) |
| Date First Available | 6 August 2012 |
| Department | boating |
| Display Type | LED |
| Included Components | AUTOMATIC CHARGING RELAY "ACR" |
| Is Discontinued By Manufacturer | No |
| Item model number | 7610 |
| Length | 0 inches |
| Manufacturer | BLUE SEA |
| Material Type | Plastic |
| Number of Items | 1 |
| Product Dimensions | 10.16 x 15.24 x 22.86 cm; 0.28 g |
| Shape | As Shown |
| Size | One Size |
| Style | 12/24v Si Acr |
| Usage | personal |
| Wattage | 2880 watts |
| Weight | 1.2 Pounds |
| Width | 0 inches |
| connector-type | Quick Connect |

## Product Details

- **Connector type:** Quick Connect
- **Contact material:** Silver
- **Contact type:** Hermetically Sealed, Vaporproof Electrical Contacts
- **Current rating:** 120 Amps
- **Mounting type:** floor mount or none

## Images

![Automatic Charging Relays (ACRs) - Image 1](https://m.media-amazon.com/images/I/91ODeRBr3SL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Just to be clear, is the this a relay or solid state diodes?  Will there be a 0.7 Volt drop across the switch as in the case with power diodes?**
A: There are  200A devices w/ RDS in the milliohm range: DigiKey has one for $25, so solid state is possible.

**Q: Will this work to combine both battery's power together if only the accessories are off one Battery. In other words the second battery only goes to th**
A: My new Sea Ray boat has these ACRs installed on them. I do not think it is working correctly. I started getting warning displays on my dash about "low voltage, and to run the engine over 1000 RPM or turn things off to prevent battery drain". SO last night I went down with a test meter and checked the batteries with engine idling above 1000 RPM. The engine battery is charging but the house battery is not.  SO does it only charge all when the house battery voltage drops to a certain point or?

**Q: My 2008 Jeep Wrangler has a 140 amp alternator.  Will the 120 amp version be dangerous or just inefficient if used?**
A: It will work. I have a 220 amp alternator on my van and have this installed. Just make sure you have a fuse in-line to the next battery. 120 amp charges the secondary battery very quick

**Q: Will this isolate a single battery in a pop up from tow vehicle charging system when the engine is off?  I don't want to rewire the vehicle battery**
A: Yes, you could use it in this application.  Just wire the camper battery to one side and the charging connection from the tow vehicle to the other side.  The unit will connect the camper battery to the vehicle charging system when the engine is running.  Once the vehicle is off and the battery voltage drops below the "combine" threshold, it will isolate the two systems.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Found at the right time
*by K***R on 4 February 2022*

It’s fullfilled my requirements in the right time

### ⭐⭐⭐⭐⭐ Review
*by G***D on 11 May 2025*

This dual sensing smart relay seamlessly pairs with my dual batteries doing the job better than what I expected. I’ve used the pilot led facility inside the cab so I can see the unit connecting and disconnecting the batteries. Highly recommend the 7610 unit fro Blue Sea and will be telling everyone about how good this product works

### ⭐⭐⭐⭐⭐ Review
*by C***T on 28 May 2015*

very good bit of kit for the landrover and works a treat. has to be the bst auto charge relay out there

## Frequently Bought Together

- Blue Sea Systems 7610 SI-ACR Automatc Charging Relay - 12/24V DC / 120A
- Blue Sea Systems 5026 ST Blade Fuse Block 12 Circuit with Ground and Cover
- Blue Sea Systems 6011 m-Series Battery Switch Dual Circuit Plus, Red

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-21*