Blue Sea 100A 285-Series Surface Mount Thermal Circuit Breaker
Blue Sea 100A 285-Series Surface Mount Thermal Circuit Breaker
SAE J1171 Ignition Protected - Weather Resistant with M8 Studs

DESCRIPTION
Integrated 100A Switching and Overcurrent Protection for Marine and Mobile DC Systems
The Blue Sea 285-Series 100A Surface Mount Thermal Circuit Breaker delivers a reliable, space-saving solution for managing high-current DC electrical systems. By combining overcurrent protection and manual on-off switching into a single compact unit, this breaker eliminates the need to wire separate isolation switches and fuse holders. It is engineered specifically for demanding marine, RV, caravan, and off-grid power setups where dependable circuit protection is critical.
Engineered for Harsh Environments and Safety Compliance
When working with high-amperage DC circuits in boats or camper trailers, environmental exposure and safety compliance are paramount. The 285-Series features a weather-resistant construction designed to endure moisture, vibration, and coastal conditions. Furthermore, it meets strict SAE J1171 external ignition protection requirements. This makes the unit safe for installation aboard petrol-powered vessels and inside battery compartments where explosive fumes or gases might accumulate, reducing the risk of accidental ignition compared to standard, unrated switches.
Intuitive Operation and Fail-Safe Design
Managing your electrical distribution is straightforward thanks to the visible yellow reset lever, which clearly indicates when the circuit is open or tripped. A dedicated red push-to-trip button allows for immediate manual disconnection when servicing downstream equipment or isolating battery banks. For maximum protection against electrical faults, the internal mechanism utilises a trip-free design. This ensures the circuit breaker cannot be manually held closed during an active fault condition, protecting your wiring and expensive electronics from thermal damage and potential fire hazards.
Key Features and Benefits
- Dual-Function Design: Combines 100A thermal circuit protection and manual on-off switching in one compact housing.
- SAE J1171 Ignition Protected: Safe for installation in petrol boat bilges, engine rooms, and enclosed battery boxes.
- Trip-Free Mechanism: Internal contacts cannot be forced closed while an overcurrent fault persists, ensuring fail-safe protection.
- Clear Visual Status: High-visibility yellow reset lever provides instant confirmation of the circuit status, paired with a red push-to-trip button.
- Marine-Grade Terminals: Equipped with corrosion-resistant M8 stainless steel threaded studs to secure heavy-duty ring terminals with minimal voltage drop.
- Terminal Insulation: Integrated rubber protection caps cover the M8 studs to prevent accidental short circuits in tight wiring enclosures.
- Weather-Resistant Build: Sealed housing resists moisture and dust ingress, suited to exposed marine and 4WD environments.
Application Considerations and Installation
The recessed mounting holes allow for a clean, secure surface-mount installation on flat panels, bulkheads, or power distribution boards. The M8 stud terminals provide ample surface area for high-current lugs, whilst the attached insulating boots fold directly over the connections for neat and compliant wiring.
Important Application Note: While this unit functions as a convenient manual disconnect switch, do not use the breaker as a primary switch where high inrush currents are expected, as repeated high-inrush switching can degrade the thermal tripping contacts over time.
Upgrade Your DC Circuit Protection
Equip your vessel, caravan, or dual-battery system with the Blue Sea 285-Series 100A Circuit Breaker for compliant, resettable protection that stands up to tough Australian conditions.
SKU: BS-7187B
SPECIFICATIONS
| Specification | Details |
|---|---|
| Product type | Thermal circuit breaker |
| Mounting / form factor | Surface mount |
| Switching function | On-off |
| Ignition protected | Yes |
| Standards / compliance | SAE J1171 external ignition protection requirements |
| SKU: | BS-7187B |
| Model #: | BS-7187B |
| MPN: | BS-7187B |
| Package weight: | 0.18 kg |
| Package length: | 0.1 m |
| Package width: | 0.08 m |
| Package height: | 0.06 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.

