Identify Sea-Dog SD-17 Surface-Mount Circuit Breakers

For an SD-17 breaker attached to a flat surface rather than through a panel, look to the Sea-Dog 830220 series. These sealed thermal breakers have visible trip indication and ¼-28 stud connections, but each part number specifies a different current rating. Do not select a higher rating because the existing breaker trips.

Identify surface-mount SD-17 breakers

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 inspect before 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.

Matching part-number listings

Each card opens an exact UsedRVParts product listing. Check the stated condition and current availability; viewing and pickup in Kelowna are by appointment.

Continue with marine ignition switch types, compact SD-13 breakers, panel-mount SD-17 breakers. For more general electrical switching see our Sea-Dog toggle-switch identification guide. For inline fuse components, visit the Sea-Dog AGC fuse-holder identification guide.

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