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Zinsco QC70 Molded Case Circuit Breaker
- 70A
- 2 Pole
- Plug-On
Zinsco
QC70
Molded Case Circuit Breaker
Brand
Zinsco
SKU
QC70
Quantity
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Zinsco QC70 - 70A 2 Pole Molded Case Circuit Breaker
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Description
Restoring power in older properties requires exact-fit components like this 70A two-pole breaker. It delivers thermal-magnetic protection for 120/240V circuits while maintaining original panel specifications. This unit mounts into legacy Zinsco and Sylvania load centers, serving as an authentic alternative to the UBIZ270 substitute. Electricians appreciate the straightforward plug-on installation. Featuring a 10kA interrupting rating, the HACR-rated design safely handles HVAC equipment loads.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QC70-R |
| Series | QC |
| Amperage | 70A |
| 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, Sylvania Load Centers |
| Wire Gauge | 8 AWG - 1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 8 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, Common Trip |
Product FAQs
6 answersWhich load centers are compatible with the Zinsco QC70 circuit breaker?
The QC70 is designed for use in legacy Zinsco and Sylvania load centers that accept type QC plug-on breakers.
Are there direct replacements available for the Zinsco QC70?
Yes, the Connecticut Electric UBIZ270 is an aftermarket replacement designed specifically to fit Zinsco and Sylvania panels requiring a 70A, 2-pole QC type breaker. Sylvania and Challenger also manufactured direct equivalents under the QC70 part number.
What wire gauge is accepted by the lugs on the QC70 breaker?
The terminal lugs on the QC70 accept wire ranging from 8 AWG to 1/0 AWG. Ensure proper torque specifications are followed during installation to maintain a secure connection.
What safety precautions should be taken when installing a replacement Zinsco QC breaker?
Zinsco load centers have known historical issues with busbar degradation and arcing. A licensed electrician should carefully inspect the panel busbar for pitting, oxidation, or burn marks before installing a replacement breaker. If the busbar is damaged, the entire panel may require replacement.
How does the QC70 connect to the panel busbar?
The QC70 utilizes a plug-on connection. It clips directly onto the raised sections of the Zinsco busbar. Two-pole breakers must be properly seated across one extended raised area and one short raised area to ensure a secure connection and prevent overheating.
What types of electrical loads is the QC70 suitable for?
As a 70A, 2-pole breaker with a 10kAIC rating at 240V, the QC70 is typically used to protect heavy 240V residential loads, such as large electric heating systems, subpanels, or heavy duty HVAC equipment. It features a thermal magnetic trip mechanism for overload and short circuit protection.
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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!