UL-Classified replacement circuit breaker cross-reference by panel brand

Residential circuit breakers that Underwriters Laboratories has Classified for use in a different manufacturer's load centre, taken from each manufacturer's own catalog. Each record is one classified breaker: its own catalog number, its ampere rating, and the competing brands' breakers it is listed to replace. Answers 'my panel is a Square D and the supply house only has Eaton in stock — what fits'. There is no single public database of this because UL Classification is tested breaker-by-breaker and every manufacturer publishes only its own outbound mapping, never the full grid across competitors.

The data

Where this came from

Every record above links the page it was taken from and quotes the sentence that states it. These are the 2 sources this dataset was assembled from.

• s3.amazonaws.comhttps://s3.amazonaws.com/globalthesource/pdfcatalog/151/Circuit_Breakers_CL_Classified.pdf
• contractor.compas.siemens-info.comhttps://contractor.compas.siemens-info.com/assets/speedfax/SF17_Sect01.pdf

Machine-readable

• data.jsonThe whole dataset — every record with its source URL and source quote.
• Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
• data.csvThe same records as one flat table, for a spreadsheet or a dataframe. The last four columns are the source URL, the quoted sentence it was read from, the date we last checked it, and which columns are our reading rather than the page's words.
• How this is made and checkedWhat "verified against source" does and does not mean.

From your own code

Same records, same quotes, without scraping the page: refsource is on PyPI and npm. Each value comes back carrying the URL it was read from and the sentence on that page that states it — .source and .quote sit on the value itself rather than in a side channel, so the checking step is available instead of skipped.

pip install refsource
refsource lookup ul-classified-circuit-breaker-cross-reference-by-brand classifying_brand=Eaton

npx -y refsource lookup ul-classified-circuit-breaker-cross-reference-by-brand classifying_brand=Eaton

Set your AI assistant up to use this

Two files and no account. Put this in .mcp.json at the root of your project — Claude Code, Cursor, Windsurf, VS Code and Codex all read that file — and your assistant can look this dataset up instead of recalling it. The server is remote, keyless and read-only.

{
  "mcpServers": {
    "referencesource": {
      "type": "http",
      "url": "https://referencesource.org/mcp"
    }
  }
}

Add to Cursor · or, on the command line: claude mcp add --transport http referencesource https://referencesource.org/mcp --scope project

Then one line in the project's CLAUDE.md or AGENTS.md, so the assistant knows when to reach for it:

When a question needs "UL-Classified replacement circuit breaker cross-reference by panel brand", call the referencesource MCP server at https://referencesource.org/mcp (tool `search_records`, dataset_slug `ul-classified-circuit-breaker-cross-reference-by-brand`) instead of answering from memory — every record it returns carries its source URL and a verbatim quote from that page.

What each tool does, and the servers built over single registers: Connect your AI assistant.

26 records. last verified against source 2026-08-26. due for re-check by 2028-08-25.

Licence. factual compilation from manufacturer catalogs