The Gould Panel GQF40MBB typically accommodates Gould or Siemens type circuit breakers. Common options include the GFCI, AFCI, and standard thermal magnetic breakers, specifically the GQ series. When replacing breakers, ensure they are compatible with the panel's specifications and ratings to maintain safety and functionality. Always consult the panel's documentation or a licensed electrician for precise recommendations.
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Siemens bought Gould so a Siemens panel should work.
The key to breaker compatibility is if it fits correctly into the buss bars in the electric panel.
Some Siemens may work but remember you are responsible for any fire or lives lost that may occur from using the wrong breaker. Get Gould breakers and you will then know they are safe. Can't find Gould breakers then replace the entire service panel. That is what I would do.
Only a Square D designed breaker can be installed in a Square D manufactured panel.
Depending on how many breakers you have in your exisiting panel if you only have a old 6 or 8 circuit panel then I would suggest a new panel, In the newer building world where you have a 20 or 30 circuit panel then I would suggest a sub panel.