Blue Sea 2.5A A-Series Single-Pole Flat Rocker Circuit Breaker
Blue Sea 2.5A A-Series Single-Pole Flat Rocker Circuit Breaker
Magnetic Hydraulic Trip-Free ON/OFF Switch with Flush Actuator

DESCRIPTION
Integrated Magnetic Hydraulic Switching and Circuit Protection
Precision 2.5A Overcurrent Protection for Marine, Caravan, and Off-Grid Panels
The Blue Sea A-Series 2.5A Single-Pole Flat Rocker Circuit Breaker offers an integrated solution that combines manual ON/OFF circuit switching with precise overcurrent protection in one compact unit. Engineered for demanding electrical environments, this unit eliminates the need to wire separate switches and fuse holders, streamlining your distribution panel layout and reducing potential points of failure.
With its low-profile 2.5A rating, this breaker is specifically suited for protecting low-draw, sensitive electronics such as navigation instruments, telemetry modules, tank monitors, LED status lighting, and relay control circuits in marine vessels, caravans, and specialised industrial vehicles.
Why Choose Magnetic Hydraulic Technology?
Unlike standard thermal circuit breakers that rely on heat-sensitive bimetallic strips, this Blue Sea A-Series breaker utilises an internal magnetic hydraulic mechanism. Standard thermal devices can suffer from nuisance tripping in hot engine bays or enclosed electrical cabinets, or fail to trip promptly in freezing conditions. The magnetic hydraulic operation senses only the actual current flow, ensuring consistent, reliable tripping thresholds regardless of ambient temperature fluctuations.
Furthermore, the integrated trip-free design is a critical safety feature for high-compliance electrical systems. In the event of a dangerous fault or short circuit, the internal mechanism will trip open and cannot be manually held in the ON position. This prevents operators from accidentally overriding the safety mechanism and causing thermal damage to wiring harnesses or sensitive downstream equipment.
Key Features and Benefits
- Dual-Function Design: Combines dependable ON/OFF switching and precise 2.5A overcurrent protection into a single panel-mounted device.
- Magnetic Hydraulic Operation: Delivers accurate, temperature-independent trip performance across varied Australian climates.
- Flush Flat Rocker Actuator: Sits flush in the ON position to prevent accidental switching in tight walkways or rough seas, with clear I/O markings and colour visibility when in the OFF state.
- Trip-Free Safety Mechanism: Ensures the circuit breaker will trip during a fault current condition even if the actuator is physically held in the ON position.
- Secure Panel Mounting: Features integrated brass threaded inserts for durable, vibration-resistant attachment to custom switch panels and distribution boards.
Ergonomic Design Built for Harsh Environments
In mobile and marine applications, accidental deactivation of critical circuits is a common hazard. The A-Series flat rocker actuator is engineered to sit completely flush with the bezel when switched ON. This low-profile geometry minimises the risk of snags or unintended bumps turning off vital instrumentation. When switched OFF or tripped, the angled actuator exposes its contrasting colour portion, providing immediate visual confirmation of the circuit status at a glance.
Installation is straightforward and secure thanks to the integrated brass threaded mounting inserts built directly into the black housing. This robust construction resists stripping and loosening under the constant vibration typical of 4WD corrugations and marine wave impacts, outperforming standard snap-in switches.
Ideal Applications
- Marine helm stations and main AC/DC power distribution panels
- Caravan, camper trailer, and motorhome 12V and 24V control boards
- Protection for sensitive navigation, GPS, and communication receivers
- Low-current monitoring systems, bilge alarm circuits, and sensor arrays
- Specialised emergency, commercial, and off-grid industrial equipment
Upgrade Your Electrical Panel Protection
Equip your vessel or off-grid vehicle with professional-grade circuit management. Add the Blue Sea A-Series 2.5A Flat Rocker Circuit Breaker to your build today for reliable, temperature-stable protection on your next installation.
SKU: BS-7399B
SPECIFICATIONS
| Specification | Details |
|---|---|
| Product type | Circuit breaker |
| Actuator | Flat rocker |
| Switching function | ON/OFF |
| Operation | Magnetic hydraulic |
| Trip-free design | Cannot be held ON during a fault current condition |
| SKU: | BS-7399B |
| Model #: | BS-7399B |
| MPN: | BS-7399B |
| HS code: | 8536200040 |
| Country of origin: | MX |
| Package weight: | 0.12 kg |
| Package length: | 0.09 m |
| Package width: | 0.05 m |
| Package height: | 0.08 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.

