Sea-Dog SD-17 120A 48V DC Circuit Breaker
Sea-Dog SD-17 120A 48V DC Circuit Breaker — Product description
The Sea-Dog SD-17 is a 120-amp resettable thermal circuit breaker built for 48-volt DC marine systems. It protects heavy wiring runs on gear like 48V trolling motor rigs and bow thrusters, and the switchable design lets it double as a manual disconnect. IP67 rated and ABYC compliant, it's ready for a wet console.
The Sea-Dog SD-17 is a resettable thermal circuit breaker built for high-current 48-volt DC systems. Rated at 120 amps, it protects the heavy wiring runs that feed gear like 48V trolling motor setups, bow thrusters, windlasses, and inverters. Wired inline on the positive feed, it trips before an overload or short cooks your wiring or your gear.
What makes this one handy is the switchable design. It's a manual-reset breaker, so after a fault you flip it back on by hand once you've sorted out the problem. But that switch also works as a disconnect. You can kill power to a circuit right at the breaker without pulling a battery terminal, which is a nice touch when you're servicing a motor or laying the boat up for the season.
It's rated IP67, so it shrugs off dust and short bouts of submersion. That's good for open consoles, bilge-adjacent spots, and anywhere spray tends to find its way. The housing is black plastic, it mounts flat to a surface, and it wires in through 1/4 inch-28 stud terminals that take a proper ring lug and torque down tight.
Standards matter on a boat, and this one carries them. It meets SAE J1625, ABYC E-11, UL1077, and SAE J1171. So if you're wiring to ABYC guidelines, or you've got an insurance survey coming up, that compliance is already covered.
One sizing note before you order. Match the breaker to your wire gauge and load, not just the motor. A 120-amp breaker suits a 48V circuit pulling up to roughly that draw, so check your motor's max continuous amp rating and size your wire to match. Undersize it and you'll fight nuisance trips, oversize it and you lose the protection. Not sure what your setup pulls? Give us a call, we wire these up all the time.
Key Features
- 120-amp rating at 48 volts DC protects heavy high-current circuits like 48V trolling motors, thrusters, and windlasses
- Switchable manual reset doubles as a disconnect, so you can kill a circuit without pulling a battery terminal
- IP67 protection rating stands up to dust and temporary submersion for exposed and bilge-adjacent mounting
- 1/4 inch-28 stud terminals accept ring lugs for a secure, torque-down connection on heavy cable
- Surface-mount black plastic housing installs flat on a console, panel, or bulkhead
- Built to SAE J1625, ABYC E-11, UL1077, and SAE J1171 for compliant marine DC 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-17 120 Amp 48V DC Resettable Circuit Breaker |
|---|---|
| Brand | Sea-Dog |
| Manufacturer Part Number | 830228 |
| UPC | 035514830379 |
| Series | SD-17 |
| Type | Resettable Thermal Circuit Breaker |
| Amperage | 120 Amp |
| Voltage | 48 Volt DC |
| Reset Type | Switchable / Manual Reset |
| Color | Black |
| Material | Plastic |
| Mounting | Surface Mount |
| Terminal | 1/4 Inch-28 Stud Terminal |
| Standards | SAE J1625 / ABYC-E11 / UL1077 / SAE J1171 |
| Protection Rating | IP67 |
| Quantity | Single |
Frequently asked questions
What is the SD-17 rated for?
It's a 120-amp breaker for 48-volt DC systems. That makes it a good fit for high-current circuits like 48V trolling motor rigs, bow thrusters, and windlasses.
Is this circuit breaker waterproof?
It carries an IP67 protection rating, so it's sealed against dust and holds up to short periods of submersion. It's fine for open consoles and spray-prone spots.
What does switchable, manual reset mean?
After a fault trips it, you reset it by hand rather than it resetting on its own. The switch also works as a manual disconnect, so you can shut off the circuit right at the breaker.
What terminals does it use?
It uses 1/4 inch-28 stud terminals. Crimp a matching ring lug onto your cable, slip it over the stud, and torque the nut down for a solid connection.
Does it meet ABYC standards?
Yes. It's built to SAE J1625, ABYC E-11, UL1077, and SAE J1171, so it fits an ABYC-compliant DC wiring job.
How do I pick the right amp rating?
Size the breaker to your wire gauge and load. Check your motor or accessory's maximum continuous amp draw and match the wire and breaker to it. If you're unsure, reach out and we'll help you size it.
