Sources first. Conditions always.
Which Breaker Fits is an independent document index for U.S. residential breaker and panel questions. It provides reference material, not installation instructions or equipment approval.
Who writes the pages
A research editor who is not a licensed electrician. No licensed electrician has reviewed the pages. Manufacturer names identify sources; the site is not affiliated with them.
What the review date means
“Archived-source review” is the date the page was checked against the archived documents and verification records. It is not a claim that every document is the newest version or that every external URL was fetched on that date. The source tables retain publication dates, editions and page references. Revision and market differences are preserved.
Text preservation tests check rendering; they cannot establish factual truth. Dataset checks compare every public transcription row to the archived CSV. OCR and a PDF text layer are representations of one source, not two independent authorities. Conflicting documents remain separate. None of these reviews is an electrical inspection or a licensed professional’s sign-off.
How to use the reference
- 01
Record the label
Keep the complete panel identifier, breaker-type list, date and ratings together. Q7
- 02
Read the exact document
Keep the maker, document revision and original page with the record. E1
- 03
Retain conditions and conflicts
Record the printed limits and the panel maker’s separate statement. Q1
- 04
Bring the references to an electrician
A document search does not decide what may be installed. S10
Original drawing and source annotations
The original drawing is schematic, not a product label, field measurement or installation instruction.
Open the original full-size SVG
The panel label and the electrician / authority having jurisdiction decide.
Sources: Q7 Square D 1100CT0501 pp.33-34, 60; S10 Murray 4810366 Rev. D p.1; S1 Siemens letter 2019-09-05 pp.1-2 (copy linked from the Siemens Sandy FAQ); E1 Eaton IL00304001Y p.1;
S4 Siemens QD brochure p.2; Q1 Square D FAQ FA109246; Q4 Square D 0700DB2001; C3, C7, C8, C10 CPSC notices. This chart lists documents to read; it is not installation guidance.
Sources and corrections
Use a citation to reach the document row and then the publisher’s page. The source library includes version and SHA256 details. Create a correction record with the exact statement and source page; no message is sent automatically.
Images and independence
Native diagrams are original editorial illustrations, not real labels or product measurements. Their cited conditions remain in readable text. AI-generated concept illustrations are clearly captioned and never identify a real product, label, wiring diagram, recall or compatibility. Native source-linked diagrams supply the factual explanations. Licensed reference photographs are identified and credited in Image credits. There are no affiliate links or paid placements.