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Federal Pacific Electric Stab-Lok and Zinsco breakers will not trip, continuously providing electricity to the short circuit, which can cause intense heat and in some cases fire. When working properly, circuit breakers are designed to prevent fires. They are designed to cut off the flow of electricity when charged with excessive electrical demand or short circuit, also known as "arching."

The Federal Pacific Electric company no longer exists but experts estimate millions of defective circuit breakers it manufactured remain in homes all over the country. Published reports show not every Federal Pacific circuit breaker is defective. In the wake of the controversy, Underwriters Laboratories (UL) removed the U-L listing for the breakers, but not before millions were sold and installed in homes built from the 1950s to the 1980s.

The Consumer Product Safety Commission did conduct additional testing of the Federal Pacific circuit breakers in the 1980s. Controversy and legal challenges followed the testing. Many called on the CPSC to recall the breakers, but they were never recalled. Some experts have said the CPSC did not recall the Federal Pacific circuit breakers because it did not have the budget to battle a possible legal fight from Federal Pacific's then-parent company

Here is a document with more info pictures of Federal Pacific Electric Stab-Lok breaker panels Federal Pacific Information

Aftermarket replacements for the Zinsco breakers are available; however, it may be more cost effective simply to replace the entire panel with a more modern and safer design from another manufacturer, depending on the number of breakers to be replaced. If the bus bar shows signs of corrosion, or if any of the breakers show signs of overheating, the panel should be replaced entirely. Many electricians advocate replacement of the panel in any case, due to its historically poor reliability.