In the 1980 time frame, the U.S. Consumer Product Safety Commission investigated the performance of FPE Stab-Loc full-width double-pole CB's in ratings from 30 - 80 amps. 122 of these breakers were tested at CPSC Wright-Malta Corp to the UL criteria which included tests at 135% and 200% rated current. The test with 135% showed 51% of the breakers failed with individual poles tested and failure was at 25% with both poles tested simultaneously. The failure rates increased to 65% and 36% respectively after 500 operations of the on/off toggle handle.
FPE and their parent company Reliance Electric tested their own breakers and notified CPSC of problems associated with their two-pole Stab-Locs. Southwest Research Incorporated had consistent findings of FPE and CPSC.
Stab-Loc combination/gfi breakers were prone to jamming due to common tripping mechanism and failed many tests.
Stab-Loc Panels had three different types of bussbar arrangements, 1) cu bus bar with punched openings, 2) "Z" clip clamped to buss bar with 10-32 screw, and 3) Stab socket on a post, attached with an 8-32 steel screw. Of these types, #3 is known to have a high probability of deteriorating and overheating of the stab socket structures when subjected to significant current flow. (All three showed failures)
Reliance Electric, startlingly, brought suit against it's own subsidiary, FPE, in U.S. District Court in Cleveland, Ohio, on June 26, 1980 alleging "materially deceptive and improper manufacturing, testing, and certification practices"....
I would not have an FPE breaker in my house come hell or high water.
