Solar Panels
Solar Controllers
Batteries
Inverters
Mains Chargers
DC-DC Chargers
Cables/Accessories
Power Converters
Monitoring
Kits
Blue Sea 350A Red e-Series 3 Position (OFF/1/2) Battery Selector Switch w/ AFD
Blue Sea 350A Red e-Series 3 Position (OFF/1/2) Battery Selector Switch w/ AFD
325A Continuous - Protects Alternator Diodes - OFF/1/2 Selector
Key features: 3-Position Selector (OFF/1/2), Ignition Protected, 350A Continuous Rating.
Highlights:Input 1 Terminal: Connection stud for Battery 1,Input 2 Terminal: Connection stud for Battery 2,AFD Terminals: Alternator Field Disconnect connection points,Output Terminal: Common output connection stud.
Demonstration of surface and panel mounting configurations compatible with e-Series switches.
Detailed dimensional diagram showing 98mm faceplate width and 76mm mounting hole centres for precise installation planning. 
Regular price
$102.00
Availability:
In Stock
View all products from Blue Sea
Guaranteed Safe and Secure Checkout
2
DESCRIPTION
Essential Battery Selection with Alternator Protection
Managing multiple battery banks on a boat or heavy-duty vehicle requires robust switching gear. The Blue Sea e-Series 3 Position Battery Selector Switch provides a reliable method to switch a single load group between two isolated battery sources. Whether you need to reserve a dedicated starting battery or cycle between two house banks, this switch offers clear, tactile control without the risk of accidental parallel connection.
Unlike standard selectors, this model includes Alternator Field Disconnect (AFD) capabilities. This critical feature protects your vessel's charging system during operation, safeguarding against costly alternator diode failure if the switch is accidentally turned to the 'OFF' position while the engine is running.
Protect Your Alternator with AFD Technology
One of the most common risks in manual battery switching is the accidental disconnection of the battery while the alternator is charging. This creates a voltage spike—often called a load dump—that can instantly destroy the rectifier diodes in your alternator.
The integrated AFD feature solves this problem. It disconnects the alternator field wire slightly before the main battery circuit opens, ensuring the alternator stops generating power before the load is removed. This simple yet effective mechanism provides peace of mind for boat owners and prevents expensive repairs to charging components.
Built for Harsh Marine Environments
Designed for the demanding conditions of the Australian marine environment, the e-Series switch features tinned copper studs for maximum conductivity and corrosion resistance. The casing is ignition protected, making it safe for installation on gasoline-powered boats where fuel vapours may be present.
With a maximum voltage of 32V DC, this switch is perfectly suited for 12V and 24V systems found in yachts, 4WDs, and caravans. The robust design handles significant power demands:
- Continuous Rating: 325A
- Intermittent Rating: 600A (5 minutes)
- Cranking Rating: 1200A (30 seconds)
Installation Flexibility and Compatibility
Retrofitting or installing a new system is straightforward thanks to the versatile case design, which allows for either surface or rear panel mounting. The switch fits standard industry mounting patterns, making it an easy upgrade for older equipment.
For heavy-duty cabling, the switch accommodates large lugs with 3/8"-16 (Approx. M10) terminal studs. The housing provides ample clearance for cables up to 4/0 AWG (Approx. 120mm²), ensuring you can maintain low voltage drop across your system.
Key Features
- 3-Position Operation (OFF/1/2): Selects between two battery sources for a single load without combining them.
- Alternator Field Disconnect (AFD): Protects alternator diodes if the switch is turned off while the engine is running.
- High Current Handling: Supports 325A continuous and 1200A cranking loads.
- Ignition Protected: Safe for use in engine rooms and fuel lockers.
- Versatile Mounting: Surface or rear panel mount with 1/4" (Approx. M6) mounting holes.
- Corrosion Resistant: Tinned copper studs and reinforced polycarbonate housing.
Reliable Power Control for Your Setup
Whether you are outfitting a cruising yacht or upgrading a touring 4WD, proper battery isolation is key to system reliability. The Blue Sea e-Series switch ensures you have power when you need it, protecting both your batteries and your charging infrastructure.
Equip your vessel with professional-grade power management. Secure your Blue Sea e-Series Battery Selector Switch today.
SKU: BS-11001B
SPECIFICATIONS
Specifications
| Switch Type | Selector 3 Position |
|---|---|
| Color | Red |
| Switch Positions | 3 |
| Battery Combine | No |
| Alternator Field Disconnect | Yes |
| Maximum Voltage | 32V DC |
| Terminal Stud Torque |
140 in-lb (15.82 N·m) (approx. 11.7 ft-lb; reference only) |
| Continuous Rating | 325A |
| Intermittent Rating | 600A (5 min) |
| Starting Rating (30 sec) | 1200A |
| Battery Inputs | 2 |
| Cable Clearance For 4/0 AWG Cables |
1.10in (27.94 mm) (reference only) |
| Cable Size to Meet Ratings |
4/0 AWG (120mm²) (AWG vs mm² is an approximate equivalence; reference only) |
| Mounting Holes |
Accept 1/4" (M6) Screw (1/4" ≈ 6.35 mm; M6 is 6 mm; reference only) |
| Stud Material | Tinned Copper |
| Switching Rating | 25A |
| Terminal Stud Size |
3/8" - 16 (M10) (3/8" ≈ 9.53 mm major diameter; M10 is 10 mm; reference only) |
| Weight (min / max) |
1.15–1.30lb (0.52–0.59 kg) (approx. 520–590 g; reference only) |
| SKU: | BS-11001B |
| Model #: | BS-11001B |
| MPN: | BS-11001B |
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.
