Blue Sea Systems 7138 187 Series DC Circuit Breaker - Surface Mount, 40 Amps
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You have 30 days to request a return. All sale items are final sale.
Blue Sea Systems 7138 187 Series DC circuit breaker combines a single-lever switch function with thermal circuit protection for marine DC systems—helping guard wiring and equipment while providing clear, visible control.
Key Features
- Single lever operation is clearly visible.
- Ignition protected (conforming to SAE J1171) for safe installation aboard gas-powered boats.
- Weather resistant housing for marine environments.
- Surface mount design for panel installation.
- 5/16-18 terminal studs for secure connections.
- Maximum voltage: 42 volts DC.
Intended Use
- Marine DC electrical systems
- Boat battery and distribution panels
- General DC circuit protection where switching and overcurrent protection are both required
Product Details
- Blue Sea Systems 7138 187 Series DC Circuit Breaker - Surface Mount, 40 Amps
- Type: DC circuit breaker (surface mount)
- Current rating: 40 Amps
- Terminal studs: 5/16-18
- Maximum voltage rating: 42 volts DC
- Ignition protection: Conforming to SAE J1171
Parts Desk Insights
Best Use Case: Ideal for DC distribution panels where you need one device to both switch a circuit and provide thermal circuit protection, with external ignition protection suitable for gas-powered boat installations.
Common Issues: During installation, confirm correct panel opening and ensure terminal hardware fully seats on the 5/16-18 studs. If nuisance trips occur, verify the load draw and wiring condition (including correct conductor size and tight, corrosion-resistant connections).
Related Products & Accessories
- Browse Fuses & Breakers - Use the breakers/fuses category to pair this breaker with appropriate upstream protection and matching panel accessories.
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.