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Blue Sea 24V 500A ML Series Solenoid Battery Isolator
Blue Sea 24V 500A ML Series Solenoid Battery Isolator
Zero Standby Draw Magnetic Latching - Silver Alloy Contacts
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DESCRIPTION
High-Amperage Magnetic Latching Switching for 24V DC Systems
Managing high-current 24V battery banks requires switching components that can handle substantial electrical loads without introducing parasitic drain or excessive voltage drop. The Blue Sea 24V 500A ML Series Solenoid Battery Isolator is engineered for demanding marine, commercial vehicle, and off-grid power architectures. Rated for a continuous 500A current, this heavy-duty solenoid provides dependable remote switching for main engine starting circuits, large inverters, high-draw house loads, and emergency battery bank combining.
Zero Standby Draw with Magnetic Latching Technology
Conventional solenoids require a continuous holding current to keep contacts closed, which gradually depletes battery reserves and generates excess heat during extended operation. The ML Series resolves this issue through advanced magnetic latching (bi-stable) technology. The unit draws zero current in either the ON or OFF state, only consuming a brief pulse of power when actively changing switch positions. This preserves critical battery capacity during long-term storage or extended off-grid deployments and eliminates coil burnout risks associated with continuous duty cycles.
Engineered for Harsh Environments and Live Load Switching
Switching high-amperage live loads can rapidly degrade standard copper contacts due to electrical arcing. To mitigate this risk, the Blue Sea ML Series incorporates silver alloy contacts, offering superior resistance to welding and contact pitting under load. This ensures consistent, reliable circuit isolation when you need it most.
Designed to withstand corrosive marine and mobile environments, the exterior connections feature 3/8"-16 (Approx. M10) tin-plated copper studs. Tin plating prevents oxidation while maintaining high electrical conductivity. With a 7/8" (22mm) stud length, the terminals easily accommodate multiple heavy-duty cable lugs, allowing for clean distribution without requiring additional busbars. Furthermore, the housing is ignition protected, making it safe for installation aboard petrol-powered vessels and in vented battery compartments.
Key Features and Benefits
- Bi-Stable Magnetic Latching: Consumes no power while maintaining an open or closed state, protecting 24V battery banks from parasitic drain.
- 500A Continuous Rating: Handles substantial DC loads, making it suitable for large inverter banks, bow thrusters, winches, and commercial engine circuits.
- Silver Alloy Contacts: Delivers high reliability and longevity when switching live loads, reducing the risk of contact failure.
- Heavy-Duty Terminal Studs: 3/8"-16 (Approx. M10) tin-plated copper studs with a 7/8" (22mm) length accept multiple heavy-gauge ring terminals for versatile wiring configurations.
- Ignition Protected Construction: Safe for installation in marine engine rooms and spaces containing potentially flammable vapours.
- Integrated Circuit Identification: Built-in recessed areas allow for clean, durable labelling of connected circuits for straightforward system maintenance.
System Integration and Important Exclusions
This solenoid allows you to mount the heavy battery switch close to the battery bank to minimise heavy-gauge cable runs, while controlling the circuit remotely from a helm, dashboard, or main control panel. Please note: This specific model (BS-7703B) is supplied as the solenoid unit only. The compatible ML-Series Remote Control Contura Switch (Part Number 2145) is not included and must be purchased separately if required for your installation.
Upgrade Your 24V Power Distribution
Equip your marine vessel, off-grid setup, or commercial vehicle with industrial-grade circuit control. Add the Blue Sea 24V 500A ML Series Solenoid to your system for efficient, zero-drain battery management.
SKU: BS-7703B
SPECIFICATIONS
| Specification | Details |
|---|---|
| Product type | Solenoid battery isolator |
| Voltage rating | 24V DC |
| Current rating | 500A continuous |
| Isolator technology | Magnetic latching |
| Current draw | Draws no current in the ON or OFF state; draws current only when changing switch state |
| Contacts | Silver alloy |
| Connections | 3/8″-16 tin-plated copper studs |
| Stud length | 7/8″ (22mm) |
| Identification | Label recesses for circuit identification |
| Applications | Engine, inverter, house loads and emergency battery combine |
| Remote control switch | ML-Series Remote Control Contura Switch not included; available separately |
| SKU: | BS-7703B |
| Model #: | BS-7703B |
| MPN: | BS-7703B |
| Package weight: | 1.68 kg |
| Package length: | 0.16 m |
| Package width: | 0.12 m |
| Package height: | 0.12 m |
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.
DOCUMENTS
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