I'm not sure you can tell everything about backups; but the one I installed in our air conditioner has been working fine for about 2 weeks now.
Electric Replacement UBIF020N Made in Connecticut
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β‘ 20 Amp Single Circuit Breaker for Q120
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Adjustable Regulator Generator PEMENOL Controller
Vacuum cleaner KARCHER VC 3, yellow
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Adjustable AC Current Sensing Switch: SZC23 No AL-CH Model, 0.2A-30A Range
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π NuTone 5901A000 Blower Wheel Assembly: Superior Efficiency and Performance