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Zinsco QC20 Molded Case Circuit Breaker
- 20A
- 2 Pole
- Plug-On
Zinsco
QC20
Molded Case Circuit Breaker
Brand
Zinsco
SKU
QC20
Quantity
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Zinsco QC20 - 20A 2 Pole Molded Case Circuit Breaker
Re-Certified
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Zinsco QC20 - 20A 2 Pole Molded Case Circuit Breaker
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Quantity
| Brand | Zinsco |
|---|---|
| Part Number | QC20 |
| Series | QC |
| Amperage | 20A |
| 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, SWD Rated |
Quantity
Zinsco QC20 - 20A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Zinsco |
|---|---|
| Part Number | QC20-R |
| Series | QC |
| Amperage | 20A |
| 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, SWD Rated |
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Description
Built to maintain older electrical systems, this 20A two-pole breaker delivers dependable long-time and instantaneous trip functions for everyday loads. It integrates seamlessly into original Zinsco panelboards, offering a precise physical fit without modification. This component acts as a substitute for the UBIZ220. Rated for 10kAIC at 120/240VAC, the breaker includes HACR and SWD certifications, ensuring safe operation for air conditioning equipment and fluorescent lighting circuits.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QC20-R |
| Series | QC |
| Amperage | 20A |
| 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, SWD Rated |
Product FAQs
6 answersWhat panels are compatible with the Zinsco QC20 circuit breaker?
The QC20 is designed for use in vintage Zinsco and Sylvania load centers that accept type QC plug-on breakers.
Is there a modern replacement available for the Zinsco QC20?
Yes, Connecticut Electric manufactures a direct replacement for this breaker under the catalog number UBIZ220. It provides an exact physical fit for original Zinsco panels without requiring adapter kits.
Are there known safety concerns with older Zinsco circuit breakers?
Yes, vintage Zinsco panels and breakers have a documented history of safety issues. Common problems include breakers failing to trip during overloads, breakers welding to the bus bar, and bus bar corrosion. These issues can lead to overheating and fire hazards, prompting many electricians to recommend full panel upgrades.
How does the QC20 breaker connect to the panel?
The QC20 features a plug-in connection. It hooks under the hold-down tab in the panel and presses down so the plug-in clip slips securely over the bus bar stab. Ensure main power is disconnected before installation.
What types of loads is the Zinsco QC20 suitable for?
As a 20A, two-pole breaker, the QC20 is typically used for 240V residential or light commercial applications. Common uses include baseboard heaters, small well pumps, and large window air conditioners.
Can I use the QC20 in a modern electrical panel?
No, the QC20 is specifically designed for legacy Zinsco and Sylvania load centers. It will not fit or function safely in modern panels from brands like Square D, Eaton, or Siemens.
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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!