Circuit Breaker 285 Sfcmt 50A
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The Circuit Breaker 285 Sfcmt 50A from LNS is a medium-duty, surface-mount DC circuit breaker designed to provide both switching and circuit protection in one unit. It features a trip-free design for added safety and a visible reset lever to clearly indicate an open (tripped) condition.
Key Features
- Medium-duty circuit protection for 25 to 200 amp loads when switching and circuit protection are both required.
- “Trip-free” design—cannot be held closed after a trip.
- Visible reset lever shows open condition.
- Drop-in replacement for 185-Series circuit breakers.
- Maximum operating voltage: 48 volts DC.
- Meets SAE J1171 external ignition protection requirements.
- IP67-protected against immersion up to 1 meter for 30 minutes.
Intended Use
- Marine DC electrical systems
- RVs and other 12V/24V-class power systems needing DC circuit protection
- Off-grid/industrial DC distribution requiring switching + overcurrent protection (application should be confirmed via the intended circuit-breaker layout/diagram)
Product Details
- Circuit Breaker 285 Sfcmt 50A
- Manufacturer / brand as supplied: LNS
- SKU (variant): 661-7183
- Rated current: 50A
- Maximum operating voltage: 48 volts DC
- Trip-free safety feature: cannot be held closed after trip
- Reset indication: visible reset lever shows open condition
- Regulatory / ignition protection: meets SAE J1171 external ignition protection requirements
- Ingress protection: IP67—protected against immersion up to 1 meter for 30 minutes
- Replacement note from provided description: drop-in replacement for 185-Series circuit breakers
Parts Desk Insights
Best Use Case: Choose this breaker when you need a surface-mount, medium-duty DC protection device that combines switching and overcurrent protection, with clear visual trip indication.
Common Issues: Confirm the breaker model matches the existing 185-Series footprint/placement and check the mating surfaces/gasket condition during installation. After fault events, use the visible reset lever indication to confirm the breaker is actually in the open (tripped) state before resetting.
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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.