Sea-Dog SD-87 50A 48V DC Marine Circuit Breaker
Sea-Dog SD-87 50A 48V DC Marine Circuit Breaker — Product description
The Sea-Dog SD-87 is a 50-amp resettable circuit breaker built to protect the high-draw circuits on your boat. Manual reset, surface mount, and sealed to an IP66 rating so it holds up in wet, exposed spots. It handles up to 48 volts DC, which covers everything from a 12-volt house circuit to a 48-volt trolling motor bank.
A circuit breaker earns its keep the day something goes wrong. The Sea-Dog SD-87 sits inline on a high-current circuit and trips before an overload can cook your wiring or the gear on the other end. It's rated at 50 amps, and unlike a one-shot fuse, you just push the button to reset it and you're back in business.
What makes this one worth a look is the 48-volt DC rating. That covers a lot of ground. A 12-volt house circuit, a 24-volt windlass, a 36 or 48-volt trolling motor bank, all of it falls inside what this breaker is built to handle. So if you're wiring up a bigger boat or a serious bow-mount motor setup, you're not stuck hunting for a higher-voltage part.
The SD-87 uses a manual reset. When it trips, it stays open until you press it back in, which is exactly what you want on a circuit feeding a bilge pump, a windlass, or an inverter. No guessing whether it quietly reset itself. You know the state at a glance.
Mounting is straightforward. It's a surface-mount body with 5/16 inch-18 stud terminals, so you land your ring lugs, torque them down, and you've got a solid mechanical connection that won't back off with vibration. The black plastic housing keeps things low-profile whether you tuck it behind the helm or mount it near the battery bank.
Out on the water, corrosion and spray are the real enemies. This breaker carries an IP66 protection rating, so it shrugs off dust and heavy wash-down without letting moisture into the mechanism. It also meets the standards that matter for marine work: SAE J553, ABYC-E11, UL1077, and SAE J1171. If you're wiring to ABYC practice, this one checks the box.
It's a single breaker, sold on its own, so grab the amperage you need for each circuit. For protecting a 50-amp load on anything up to a 48-volt system, it's a clean, serviceable choice that you can reset in seconds instead of digging for a spare fuse.
Key Features
- 50-amp rating protects high-draw circuits like windlasses, inverters, and trolling motor banks from overload
- 48-volt DC maximum covers 12V, 24V, 36V, and 48V systems with a single part
- Manual reset button stays open after a trip, so you always know the circuit's state
- 5/16 inch-18 stud terminals take ring lugs for a vibration-proof mechanical connection
- IP66-rated housing seals out dust and heavy spray in exposed, wash-down locations
- Meets SAE J553, ABYC-E11, UL1077, and SAE J1171 for a compliant marine install
- Surface-mount black plastic body installs low-profile at the helm or near the battery bank
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-87 Resettable Circuit Breaker, 50 Amp, 48 Volt DC |
|---|---|
| Brand | Sea-Dog |
| Manufacturer Part Number | 830523 |
| UPC | 035514830676 |
| Model | SD-87 |
| Amperage Rating | 50 Amp |
| Voltage Rating | 48 Volt DC |
| Reset Type | Manual Reset |
| Color | Black |
| Material | Plastic |
| Mounting | Surface Mount |
| Terminal Type | 5/16 Inch-18 Stud Terminal |
| Standards | SAE J553 / ABYC-E11 / UL1077 / SAE J1171 |
| Protection Rating | IP66 |
| Quantity | Single |
Frequently asked questions
What amperage is the Sea-Dog SD-87 rated for?
It's a 50-amp breaker, so it protects circuits carrying up to a 50-amp load.
What voltage systems does it work with?
It's rated to 48 volts DC, which covers 12V, 24V, 36V, and 48V systems, including trolling motor banks.
Is the SD-87 a manual or automatic reset breaker?
It's a manual reset. After it trips, it stays open until you press the button back in, so you always know the circuit is off.
How does the breaker mount?
It's a surface-mount body with 5/16 inch-18 stud terminals. You land ring lugs on the studs and torque them down for a solid connection.
Is the SD-87 waterproof?
It carries an IP66 protection rating, so it seals out dust and heavy spray. It's built for exposed, wash-down locations on a boat.
Does it meet marine wiring standards?
Yes. It meets SAE J553, ABYC-E11, UL1077, and SAE J1171, so it fits an ABYC-compliant install.
