Blue Sea Systems 7146 187 Series DC Circuit Breaker - Surface Mount, 120 Amps
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Blue Sea Systems 7146 is an 187 Series 120A DC thermal circuit breaker for surface-mount installations where you need both switching control and circuit protection in one device. Its single-lever operation is designed to be easy to see, and the breaker is ignition protected to meet SAE J1171 external ignition protection requirements for installation aboard gas-powered boats.
Key Features
- Single lever operation clearly visible
- Ignition protected—meets SAE J1171 external ignition protection requirements (safe for installation aboard gas-powered boats)
- Weather resistant construction
- Surface-mount thermal circuit breaker for DC systems
- 5/16-18 terminal studs
- Maximum voltage rating: 42 volts DC
Intended Use
- DC electrical systems on marine and other off-road applications
- Boat electrical protection where ignition protection per SAE J1171 is required
- Switchable DC circuits needing overload protection (thermal, manual reset/trip-free design)
Product Details
- Brand/Series: Blue Sea Systems 187 Series
- Part Number (SKU): 661-7146
- Product type: DC circuit breaker (thermal switchable/manual reset, trip-free)
- Mounting style: Surface mount
- Amps: 120 Amps DC
- Maximum voltage: 42 volts DC
- Terminal stud size: 5/16-18
Parts Desk Insights
Best Use Case: Use this breaker as a combined switching and overcurrent protection device for a 120A DC load or branch—especially in marine builds that need SAE J1171 external ignition protection compliance.
Common Issues: If nuisance trips occur, confirm the wiring gauge/lug fit and that terminations are tightened properly on the 5/16-18 studs. Also verify the system voltage is within the breaker’s maximum voltage rating (42V DC), and confirm your installation location and sealing/mounting surfaces support weather-resistant use.
Related Products & Accessories
- Fuses - Browse related marine fuse protection components for upstream or backup protection.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.