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Zinsco QC30 Molded Case Circuit Breaker
- 30A
- 2 Pole
- Plug-On
Zinsco
QC30
Molded Case Circuit Breaker
Brand
Zinsco
SKU
QC30
Quantity
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Zinsco QC30 - 30A 2 Pole Molded Case Circuit Breaker
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Zinsco QC30 - 30A 2 Pole Molded Case Circuit Breaker
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| Brand | Zinsco |
|---|---|
| Part Number | QC30-R |
| Series | QC |
| Amperage | 30A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | QC |
|---|---|
| Terminal Type | Lugs |
| For Use With | Zinsco Load Centers |
| Wire Gauge | 14-6 AWG |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Quantity
Zinsco QC30 - 30A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Zinsco |
|---|---|
| Series | QC |
| Amperage | 30A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | QC |
|---|---|
| Terminal Type | Lugs |
| For Use With | Zinsco Load Centers |
| Wire Gauge | 14-6 AWG |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
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Description
Sourced for residential and commercial applications, this 30-amp thermal-magnetic breaker restores power distribution in older electrical systems. It mounts into original Zinsco load centers, providing an exact fit without the need for aftermarket adapters. Users often cross-reference this part with the UBIZ230 substitute. Featuring a 10kA interrupting rating and HACR certification, it handles standard heating and cooling equipment loads safely.Specifications
| Brand | Zinsco |
|---|---|
| Series | QC |
| Amperage | 30A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | QC |
|---|---|
| Terminal Type | Lugs |
| For Use With | Zinsco Load Centers |
| Wire Gauge | 14-6 AWG |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
5 answersWhich load centers accept the Zinsco QC30 circuit breaker?
The QC30 is designed exclusively for legacy Zinsco and Sylvania electrical panels that accept Type QC plug-in breakers. It features a proprietary mounting clip that will not fit modern panels from other manufacturers.
Is there a modern replacement available for the obsolete Zinsco QC30?
Yes. Connecticut Electric manufactures an ETL-listed, direct drop-in replacement under the catalog number UBIZ230 or UBIZ230-1. This provides a newly manufactured alternative for maintaining existing Zinsco load centers.
What safety concerns are associated with legacy Zinsco circuit breakers?
Original Zinsco breakers have a documented history of failing to trip during overcurrent conditions and occasionally fusing to the panel bus bar. While replacing a faulty breaker restores immediate function, many licensed electricians recommend a complete panel upgrade to mitigate long-term hazards.
How much panel space does the QC30 require for installation?
The QC30 is a thick-series, two-pole breaker that requires two 3/4-inch spaces, taking up a total of 1.5 inches of width on the panel bus bar.
How does the QC30 connect to the panel bus bar?
It utilizes a plug-on connection with a deep slot that attaches directly to the flat connecting bus bars found in Zinsco and Sylvania load centers.
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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!