Blue Sea 350A Red e-Series Dual Circuit Battery Switch
Blue Sea 350A Red e-Series Dual Circuit Battery Switch
350A Continuous - Switches Two Isolated Battery Banks Simultaneously

DESCRIPTION
Simplify Your Dual Battery Management with the e-Series Dual Circuit Switch
Managing multiple battery banks in marine and automotive applications often involves complex wiring and multiple isolators. The Blue Sea Systems e-Series Dual Circuit Battery Switch solves this problem by allowing you to switch two isolated battery banks simultaneously with a single turn of the knob. This innovative design replaces the need for two separate switches, streamlining your dashboard or engine room layout while maintaining critical circuit separation.
Simultaneous Switching for Isolated Banks
Designed for dual-battery systems—typically a starting battery and a house battery—this switch ensures that both circuits are energized or disconnected at the same time. Crucially, it maintains isolation between the two banks. This means your sensitive electronics on the house circuit remain powered without risking the starting battery's charge, and engine starting spikes are kept away from your accessories. It offers a straightforward ON/OFF mechanism that simplifies operation for boat owners and vehicle operators.
Ignition Protected and Marine-Grade Durability
Safety is paramount in enclosed engine spaces and fuel lockers. This unit is ignition protected, making it safe for installation aboard gasoline-powered boats or vehicles where fuel vapours may be present. The case design allows for versatile mounting options, including surface or rear panel mounting, ensuring a clean installation regardless of your setup constraints.
High-Current Handling and robust Connections
Built to handle significant electrical loads, this switch features a continuous rating of 350A and a cranking rating of 700A per circuit (30 seconds). It is engineered with tinned copper studs for maximum conductivity and corrosion resistance, essential for harsh saltwater environments.
The terminals are designed to accept large cables required for high-current applications:
- Terminal Stud Size: 3/8"-16 (Approx. M10)
- Cable Compatibility: Accepts heavy-duty lugs for cable sizes up to 4/0 AWG (Approx. 120mm²)
- Clearance: Generous 1.10" (27.94 mm) clearance for cable routing
*Note: Typical de-rating factors apply based on ambient temperature and cable sizing.
Versatile Voltage Compatibility
While often searched for as a 12V dual battery switch, this unit boasts a maximum voltage rating of 32V DC. This makes it perfectly suitable for both 12V and 24V systems commonly found in larger vessels, trucks, and off-grid 4WD setups. Whether you are refitting a yacht or upgrading a touring vehicle, this switch provides the reliability Blue Sea Systems is known for.
Key Features
- Simultaneous Control: Switches two isolated battery banks with one simple knob.
- High Amperage Rating: 350A continuous rating suitable for heavy loads.
- Safety Certified: Ignition protected for safe use around fuel sources.
- Flexible Mounting: Case design supports surface or rear panel installation.
- Corrosion Resistant: Tinned copper studs ensure long-term electrical integrity.
Upgrade Your Power System Reliability
Ensure your battery system is safe, organized, and easy to operate. Install the Blue Sea e-Series Dual Circuit Switch today for a cleaner, more efficient power distribution setup.
SKU: BS-5510EB
SPECIFICATIONS
Specifications
| Switch Type | Dual Circuit |
|---|---|
| Color | Red |
| Switch Positions | 2 |
| Battery Combine | No |
| Alternator Field Disconnect | No |
| Maximum Voltage | 32V DC |
| Terminal Stud Torque |
140 in-lb (15.82 N·m) (approx. 11.7 ft-lb; reference only) |
| Continuous Rating | 350A |
| Intermittent Rating | 525A (5 min) |
| Starting Rating (30 sec) | 700A per circuit |
| 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; 16 TPI ≈ 1.59 mm pitch; reference only) |
| Weight (min / max) |
1.16–1.30 lb (0.53–0.59 kg) (approx. 530–590 g; reference only) |
| SKU: | BS-5510EB |
| Model #: | BS-5510EB |
| MPN: | BS-5510EB |
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.














































