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Angie's List and NBC Bay Area both highlighted an October 2002 ruling in a New Jersey Superior Court, which found that FPE (Federal Pacific Electric), the manufacturer of the Stab-Lok breakers and panels, "knowingly and purposefully [sic] distributed circuit breakers which were not tested to meet UL standards as indicated on their label".
Zinsco would remain with copper in both their panels and breakers until the third major copper shortage in the early 1960s, when they would switch to an aluminum bus. In 1963, Zinsco introduced the R-38 twin breaker, which was the only twin circuit breaker that also made contact on both bus-bars for 240 volts in a single breaker space.
The company, in its earliest form as Federal Electric, a lighted sign company, was founded in 1901. It later made home and kitchen appliances, neon signs, police sirens, and circuit-breakers. Everything but circuit-breakers had been spun off or sold off to other companies by the 1940s, and the name was changed to Federal Pacific Electric.
Ordnance crest "WHAT'S IN A NAME" - military education about SNL. This is a historic (index) list of United States Army weapons and materiel, by their Standard Nomenclature List (SNL) group and individual designations — an alpha-numeric nomenclature system used in the United States Army Ordnance Corps Supply Catalogues used from about 1930 to about 1958.
The failure of a neutral fuse would cut off power flow through the affected circuit, but the hot conductor could still remain hot relative to ground, an unexpected and potentially hazardous situation. Because of the presence of a neutral fuse, and in the event that it blew, the neutral conductor could not be relied on to remain near ground ...
In that era of patch panels and small numbers of high wattage dimmers, Kliegl Brothers offered its "Safpatch" patch panels, and "Rotolector" rotary power switches, both developed by Herbert Kliegl. Both products interlocked the electrical contacts with a circuit breaker, preventing arcs while switching or patching.