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Zinsco QCAL90 Molded Case Circuit Breaker
- 90A
- 2 Pole
- Plug-On
Zinsco
QCAL90
Molded Case Circuit Breaker
Brand
Zinsco
SKU
QCAL90
Quantity
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Zinsco QCAL90 - 90A 2 Pole Molded Case Circuit Breaker
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Description
A drop-in replacement for vintage systems, the Zinsco QCAL90 provides 90A of reliable overcurrent protection. This two-pole molded case circuit breaker restores power in older electrical setups without requiring panel upgrades. Designed as a thick series breaker with a 1.5-inch width, it installs into classic Zinsco and Sylvania load centers. For modern compliance, this unit is frequently replaced by the UBIZ290 substitute.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QCAL90-R-R |
| Series | QC |
| Amperage | 90A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Zinsco Load Centers, Sylvania Load Centers |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | HACR Rated, Common Trip |
Product FAQs
5 answersWhich electrical panels are compatible with the Zinsco QCAL90?
This breaker is specifically designed to fit legacy Zinsco and Sylvania load centers that accept QC or QCAL series plug-in breakers. It features a proprietary mounting clip that will not fit modern panels from brands like Square D, Siemens, or Eaton.
Is there a modern aftermarket replacement for the QCAL90?
Yes. The Connecticut Electric UBIZ290 is a newly manufactured, ETL-listed direct replacement for the QCAL90. It provides the same 90-amp, 2-pole protection and fits the exact same Zinsco and Sylvania load centers.
How much physical space does the QCAL90 take up in a panel?
The QCAL90 is a thick-series breaker that requires 1.5 inches of total panel space. It occupies two standard 3/4-inch slots in a compatible Zinsco or Sylvania load center.
What is the difference between the Zinsco QC and QCAL series breakers?
Both series fit the same Zinsco panels, but the QCAL designation indicates that the breaker's terminal lugs are rated for use with both copper and aluminum conductors. Always verify your wire type and gauge before installation.
Are there any special safety considerations when installing this breaker?
Legacy Zinsco panels are known for potential bus bar connection issues. Before installing the QCAL90, a licensed electrician should inspect the panel's bus bars for arcing, pitting, or corrosion. If the bus bar is damaged, a new breaker will not resolve the issue and a panel upgrade may be required.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 15 reviews.
Total 5 star reviews: 15 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
15 reviews
- DSDenise S. A.Verified BuyerReviewingEaton / Cutler-Hammer QC3070H - 70A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Great turn around!
My experience was great. I had the item quickly; and it was more reasonably priced than other places I checked. Not having to pay freight was an absolute bonus.
- DMDouglas M.Verified BuyerReviewingEaton / Cutler-Hammer QC1020 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/28/25Just what I needed
Ordering was easy and the processing was immediate. The beakers I ordered was exact. I recommend this company for your needs.
- GLGianna L.ReviewingEaton / Cutler-Hammer QC1015 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars11/27/23Great
as advertised!
- EDElmer D.ReviewingZinsco QCAL100 - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/28/23Very accurate, delivered on time
Very accurate, delivered on time and fixed my problem good job
- RBRawle B.ReviewingEaton / Cutler-Hammer QC1015 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/8/23SuperBreakers had the parts I
SuperBreakers had the parts I needed in stock, was shipped and delivered on time. Great service!