Zinsco UBIZ280 Miniature Circuit Breaker

This breaker is engineered specifically for legacy Zinsco load centers requiring Type QC breakers. It features a specialized plug-in clip design that attaches to the unique flat connecting busbars found in older Zinsco and Sylvania-Zinsco enclosures.

The UBIZ280 is an aftermarket replacement manufactured by Connecticut Electric. It serves as a direct cross-reference for obsolete 80A two-pole Zinsco breakers, specifically replacing original QC80 and QCAL80 catalog numbers.

The UBIZ280 is a full size, thick series molded case circuit breaker. It occupies two standard spaces in a compatible Zinsco load center, distinguishing it from the half-size tandem breakers that were also produced for these panels.

A two-pole 80A breaker is frequently installed to protect heavy electrical loads such as large central air conditioning systems, electric furnaces, or to serve as a feeder breaker supplying power to a secondary subpanel.

The box lugs accept wire gauges from 14 AWG to 2 AWG. Installers can use either copper or aluminum conductors, provided the wire is sized correctly for the 80A load and the terminals are torqued to the manufacturer specifications to prevent arcing.

The breaker features a fixed long time and instantaneous (LI) trip function. The thermal bimetal component provides delayed tripping for sustained overloads, while the magnetic component ensures an immediate trip response to high fault currents up to its 10kAIC rating.

Yes. While designed to fit legacy infrastructure, the Connecticut Electric UBIZ280 is a newly manufactured component that is ETL Listed to UL 489 standards for molded case circuit breakers, ensuring it meets modern safety and performance requirements.