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Blue Sea 24V 500A ML Series Auto Charge Relay
Blue Sea 24V 500A ML Series Auto Charge Relay
Magnetic Latch - 500A Continuous - Dual Sensing - 24V DC
Regular price
$420.00
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DESCRIPTION
High-Capacity 24V Battery Management for Marine and Heavy-Duty Systems
Managing multiple battery banks in 24V systems requires robust, reliable switching technology. The Blue Sea ML-Series Automatic Charging Relay (ACR) provides a superior solution for automatically managing the charging of two large battery banks, such as a start battery and a house bank. Designed for high-amperage applications, this unit removes the need for manual switching, ensuring your batteries are charged when a source is active and isolated when discharging to prevent accidental depletion of your starting power.
Magnetic Latching Technology for Maximum Efficiency
Unlike standard continuous-duty solenoids that generate heat and consume significant power just to stay closed, the ML-Series utilises a magnetic latching (bi-stable) mechanism. This advanced design draws very low current (less than 40mA) to monitor terminal voltage in both the "ON" or "OFF" states. It only draws moderate current for a fraction of a second when changing states. This ensures that your energy goes into charging your batteries, not heating up the relay, making it essential for energy-conscious off-grid and marine setups.
Dual Sensing and Smart Isolation
This ACR features intelligent dual sensing technology, meaning it monitors voltage on both battery banks. If you are charging your house bank via a solar array or a shore charger, the relay will close to top up the start battery. Conversely, when the engine alternator is running, it combines the banks to charge the house battery.
For sensitive electronics, the unit offers configurable Start Isolation. This feature temporarily isolates the house loads from the engine circuit during cranking, protecting navigation units, sonar, and other sensitive equipment from voltage sags and spikes.
Manual Control for Safety and Service
While the operation is fully automatic, the integrated yellow manual control knob provides complete peace of mind. It allows for:
- Lock Off: Isolate batteries completely for safe servicing or storage.
- Manual On: Combine batteries for emergency starting if the start battery is low.
- Auto: The default set-and-forget mode for daily operation.
Built for High-Output Environments
With a continuous rating of 500 Amperes, this relay is engineered to support modern high-output alternators commonly found on large vessels, heavy trucks, and commercial vehicles. The robust construction features 3/8"-16 (Approx. M10) tin-plated copper stud terminals which provide maximum conductivity and corrosion resistance. These long terminals allow for multiple cable lugs to be connected securely (accepting up to 4/0 AWG or approx. 120mm² cables).
Key Features
- 500A Continuous Rating: Handles heavy loads and high-output charging sources reliably.
- Magnetic Latch (Bi-Stable): Ultra-low power consumption with no heat generation in the hold state.
- Dual Sensing: Bi-directional charging manages inputs from alternators and solar/shore chargers.
- Silver Alloy Contacts: Ensures high reliability for switching live loads up to 300A.
- LED Output: Compatible with remote LEDs to indicate combined, isolated, or lockout states.
- Engine Isolation: Can be configured to isolate two engines while running to protect individual engine electronics.
- IP66 Rating: Protected against powerful water jets, suitable for harsh marine environments.
Note: This unit is the 24V DC model. The ML-Series Remote Control Contura Switch is not included with this SKU (BS-7623B) and is available separately if remote operation is required.
Optimise Your 24V Power System
Ensure your batteries are charged efficiently and your starting power is always protected. Upgrade to the Blue Sea ML-Series 24V ACR for professional-grade battery management.
SKU: BS-7623B
SPECIFICATIONS
Specifications
| Control Circuit Connection |
Tinned wires — provided on retail units Deutsch DTM / Amphenol ATM — provided on bulk units |
|---|---|
| Nominal Voltage | 24V DC |
| Manual Control | Yes |
| Engine Isolation |
Condition: Two engines are running
|
| Mounting |
#10 (approx. #10 major diameter 4.83 mm; reference only) |
| Start Assist |
Condition: Engine starting
|
| Start Isolation |
Condition: Engine starting
|
| Amperage Operating Current | 13mA @ 25°C nominal VDC |
| Amperage Operating Current when changing state | <7.0A |
| Terminal Stud Torque |
140 in-lb (15.82 N·m) (approx. 11.7 ft-lb; reference only) |
| Continuous Rating | 500A |
| Intermittent Rating | 700A (5 min) |
| Cranking Rating (30 sec) | 1450A DC |
| Minimum Operating Temperature | -10°C |
| Maximum Operating Temperature | 60°C |
| Cable Size to Meet Ratings |
4/0 AWG x 2 (AWG to mm² varies by strand class/standard; reference only) |
| Live Current Switching | 300A @ 12V DC |
| Stud Material | Tinned Copper |
| Switching Cycles | 100000 |
| Terminal Ring Diameter Clearance |
1.12in (28.45 mm) (reference only) |
| Terminal Stud Length |
1.50in (38.1 mm) (reference only) |
| Terminal Stud Size |
3/8" - 16 (M10) (3/8" ≈ 9.53 mm major diameter; M10 is 10 mm; 16 TPI ≈ 1.59 mm pitch; reference only) |
| Wire Size |
20 AWG (approx. 0.52 mm² conductor area for standard solid AWG; reference only) |
| Relay Contact Position |
Combine 30 sec: 27.0V Combine 90 sec: 26.0V Open 10 sec: 24.7V Open 30 sec: 25.5V Open High: 32.4V |
| Weight (min / max) |
2.10–2.10 lb (0.95–0.95 kg) (approx. 950 g; reference only) |
| SKU: | BS-7623B |
| Model #: | BS-7623B |
| MPN: | BS-7623B |
WARRANTY
Blue Sea Warranty Policy
Blue Sea Systems products sold by us are supplied with a warranty against defects for the warranty period shown below, subject to the product type, application and the terms of this warranty policy.
The express warranty provided by us is limited to a maximum of 5 years from the original date of purchase, unless otherwise required under Australian Consumer Law.
Blue Sea Systems may offer longer manufacturer support on some products at their discretion
Warranty Lengths by Product Range
| Blue Sea Product Range | Warranty Length | Application / Notes |
|---|---|---|
| Most Blue Sea Systems Products | 5 years | Applies to most Blue Sea Systems products found to be defective in materials or manufacture. |
| P12 Battery Chargers | 5 years | Warranty period starts from the original date of purchase. |
| P12 Remote Displays | 5 years | Warranty period starts from the original date of purchase. |
| Digital Meters | 3 years | Warranty period starts from the original date of purchase. |
| Vessel System Monitors | 3 years | Warranty period starts from the original date of purchase. |
Warranty Assessment and Remedy
If a Blue Sea Systems product is found to be defective in materials or manufacture within the applicable warranty period, we will, at our discretion, arrange a repair, replacement, store credit or refund, depending on the nature of the fault and the requirements of Australian Consumer Law.
Products may need to be returned for assessment before a warranty claim can be approved. Where required, the product must be returned with dated proof of purchase and a clear description of the fault.
Labour costs for removing, replacing, reinstalling or diagnosing a product are not covered by this express warranty unless otherwise required under Australian Consumer Law.
Making a Warranty Claim
To make a warranty claim, please contact us with your dated proof of purchase, product details and a description of the fault.
The product may need to be returned for inspection before the claim can be assessed. If the product is confirmed to be faulty and covered by this warranty, we will advise the available remedy.
What This Warranty Does Not Cover
This warranty does not cover faults or damage caused by incorrect installation, incorrect application, misuse, abuse, neglect, unauthorised modification, accidental damage, normal wear and tear, environmental damage, or failure to use the product in accordance with the manufacturer's instructions.
- Incorrect installation or wiring
- Incorrect product selection or application
- Misuse, abuse or neglect
- Physical or accidental damage
- Water ingress or environmental damage outside the product's intended use
- Unauthorised modification or repair
- Normal wear and tear
- Labour costs for removal, replacement, reinstallation or diagnosis
- Freight, travel or call-out costs unless otherwise required by law
- Products not returned for assessment when reasonably required
Manufacturer Support
Blue Sea Systems may provide additional manufacturer support on some products beyond the warranty period listed above. Where available, we may assist customers in contacting the manufacturer, but any manufacturer support beyond the express warranty period is subject to the manufacturer's own terms and continued availability.
Australian Consumer Law
This warranty is in addition to other rights and remedies available at law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
