Sea-Dog SD-17 Surface-Mount Breakers: 25–150A Guide

Sea-Dog's 830220–830229 SD-17 breakers are surface-mounted, resettable marine thermal protectors for appropriate 12–48V DC systems. They are sealed to IP67 with a visible trip indicator, but the current rating ranges from 25A to 150A. Compare the case footprint and original circuit before selecting a replacement.

SD-17 surface-mount breaker ratings

The table compares exact manufacturer numbers and separates electrical ratings from mechanical fit. On small screens, scroll horizontally to see all specifications.

Sea-Dog MPN Amps Mounting Terminal DC maximum
830220 25A Surface mount ¼-28 studs 48V DC
830221 30A Surface mount ¼-28 studs 48V DC
830222 40A Surface mount ¼-28 studs 48V DC
830223 50A Surface mount ¼-28 studs 48V DC
830224 60A Surface mount ¼-28 studs 48V DC
830225 70A Surface mount ¼-28 studs 48V DC
830226 80A Surface mount ¼-28 studs 48V DC
830227 100A Surface mount ¼-28 studs 48V DC
830228 120A Surface mount ¼-28 studs 48V DC
830229 150A Surface mount ¼-28 studs 48V DC
Important fit distinction: Sea-Dog SD-17 surface models are not the same mounting shape as the panel versions. IP67 sealing and maximum 48V DC rating do not by themselves establish suitability for every protected branch. Never increase the breaker amperage without confirming the circuit wiring and manufacturer's protective-device requirement.

Manufacturer diagram dimensions: A = 2-7/8 in, B = 1-7/8 in, C = 1-3/4 in, D = 2-3/16 in, E = 1-1/8 in. These are the manufacturer's labelled measurements, not all mounting-hole dimensions. See the linked original drawing for what each label measures.

Hi-Amp construction: Sealed IP67 housing with a manual reset and visible trip indication. Sea-Dog lists 3,000A interrupt capacity at 14V DC and 1,500A at 48V DC, with ignition protection to SAE J1171.

Manufacturer dimension and specification references: dimension diagram. These include the original switch and breaker drawings.

What to check before selecting a replacement

  1. Check that the original breaker mounts on a surface, with sufficient clearance behind the studs and wiring.
  2. Match the amp rating to the original marine circuit and size the cables and lugs as required.
  3. Compare the case's A–E dimensions with the manufacturer's drawing before drilling mounting holes.
  4. Verify ¼-28 stud hardware and the 48V DC maximum rating against the installed system.
  5. Disconnect power and follow marine standards for secure connections, overcurrent protection and ignition-protected installations.

Find matching Sea-Dog parts

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Continue with compact SD-13 breakers, panel-mount SD-17 breakers. For more general electrical switching see our Sea-Dog maintained-versus-momentary toggle comparison. For inline fuse components, visit the Sea-Dog AGC fuse-holder selection guide.

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