Sea-Dog SD-17 50A Thermal Circuit Breaker | Marine
Sea-Dog SD-17 50A Thermal Circuit Breaker | Marine — Product description
The Sea-Dog SD-17 is a 50-amp resettable thermal circuit breaker built for 48-volt DC marine circuits. It surface-mounts with 1/4 inch-28 stud terminals, carries an IP67 rating, and resets by hand after a fault. If you're protecting a heavy accessory run or a high-voltage battery lead, it's a clean, code-friendly way to do it.
The Sea-Dog SD-17 is a resettable thermal circuit breaker rated for 50 amps at 48 volts DC. It's the kind of protection you wire into a heavy accessory run when a fuse alone won't do the job and you want to reset the circuit yourself without digging for a spare. It trips on an overload, and you flip it back on once you've sorted out the cause.
That 48-volt DC rating is what sets this one apart. A lot of marine breakers top out at 12 or 32 volts, so if you're running a 48-volt battery bank, a high-thrust electric-drive lead, or another 48V load, this breaker is built for that voltage. It handles up to 50 amps of continuous current, which makes it a good match for larger pumps, windlasses, inverters, and other loads that pull real amperage.
It's a surface-mount unit, so it bolts flat to a bulkhead, panel, or mounting board. The connections are 1/4 inch-28 stud terminals, which take a ring terminal and a nut for a solid joint that won't shake loose. That matters on a boat. Screw terminals back out over a season of pounding, and studs don't. The body is black plastic, and the reset is manual and switchable, so you can also use the lever to shut the circuit off by hand when you're working on it.
The SD-17 carries an IP67 protection rating, so it's sealed against dust and short-term water immersion. That doesn't mean you should drop it in the bilge, but it'll shrug off spray, rain, and the damp that lives in every console. It's built to SAE J1625, ABYC E-11, UL1077, and SAE J1171 standards, so it meets the marine electrical codes surveyors and insurers care about.
Wire it inline as close to the power source as you can, size your cable to the load, and you've got a circuit you can protect and reset without tools. It's sold as a single breaker.
Key Features
- 50-amp rating at 48 volts DC handles heavy loads like windlasses, inverters, pumps, and high-voltage battery banks
- IP67 protection rating seals against dust and short-term water immersion, so it shrugs off spray, rain, and console damp
- 1/4 inch-28 stud terminals take ring terminals for a vibration-proof connection that won't back out over a season of pounding
- Manual switchable reset lets you trip and reset by hand, and use the lever as an on/off disconnect when you're working on the circuit
- Surface-mount black plastic body bolts flat to a bulkhead, panel, or mounting board
- Built to SAE J1625, ABYC E-11, UL1077, and SAE J1171 standards for code-compliant marine wiring
Why Buy from NVN Marine
- Authorized Sea-Dog reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Sea-Dog SD-17 Resettable Thermal Circuit Breaker, 50 Amp, 48 Volt DC, Surface Mount |
|---|---|
| Brand | Sea-Dog |
| Manufacturer Part Number | 830223 |
| UPC | 035514830324 |
| Series | SD-17 |
| Amperage Rating | 50 Amp |
| Voltage Rating | 48 Volt DC |
| Breaker Type | Resettable Thermal |
| Reset Type | Manual / Switchable |
| Color | Black |
| Material | Plastic |
| Mounting | Surface Mount |
| Terminal Type | 1/4 Inch-28 Stud Terminal |
| Standards | SAE J1625 / ABYC-E11 / UL1077 / SAE J1171 |
| Protection Rating | IP67 |
| Quantity | Single |
Frequently asked questions
What voltage and amperage is the SD-17 rated for?
It's a 50-amp breaker rated for 48 volts DC. That higher voltage rating is what separates it from typical 12V or 32V marine breakers, so it suits 48-volt battery banks and electric-drive circuits.
Is the SD-17 waterproof?
It carries an IP67 protection rating, which means it's sealed against dust and can handle short-term water immersion. It'll take spray, rain, and console humidity, though we'd still mount it out of standing water.
How does it mount and connect?
It's a surface-mount breaker that bolts flat to a bulkhead or panel. The connections are 1/4 inch-28 stud terminals, so you crimp on ring terminals and lock them down with nuts for a joint that won't vibrate loose.
What does a switchable reset mean?
The reset is manual, so after the breaker trips on an overload you flip it back on by hand. Switchable means you can also use the same lever as an on/off disconnect to kill the circuit when you're servicing it.
Does it meet marine electrical codes?
Yes. It's built to SAE J1625, ABYC E-11, UL1077, and SAE J1171 standards, which are the marine electrical specs surveyors and insurers look for.
Does this come as more than one breaker?
No, the SD-17 is sold as a single breaker.
