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Zinsco QC55 Molded Case Circuit Breaker
- 55A
- 2 Pole
- Plug-On
Zinsco
QC55
Molded Case Circuit Breaker
Brand
Zinsco
SKU
QC55
Quantity
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Zinsco QC55 - 55A 2 Pole Molded Case Circuit Breaker
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Description
Sourcing exact replacements for discontinued electrical systems is critical, and this 55A molded case breaker fulfills that need for vintage properties. It supplies essential thermal-magnetic protection for 120/240V branch circuits. This component installs into classic Zinsco and Sylvania load centers without requiring adapter hardware. If utilizing the UBIZ250 substitute, users must downsize the circuit to 50 amps. It features a 10kAIC rating and common trip functionality for safety.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QC55-R |
| Series | QC |
| Amperage | 55A |
| 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
4 answersWhich load centers are compatible with the Zinsco QC55 circuit breaker?
The QC55 is designed for use in classic Zinsco and Sylvania load centers that accept Type QC plug-on breakers. It installs directly onto the bus bar without the need for adapter hardware.
What are the alternate catalog numbers for the Zinsco QC55?
This 55A breaker serves as a direct replacement for legacy part numbers including QC255, QC-55, and Q255.
Is there a modern Connecticut Electric UBIZ replacement for the 55A QC55?
Connecticut Electric does not manufacture an exact 55A UBIZ replacement. If utilizing a modern substitute, users must downsize the circuit to 50 amps using the UBIZ250, provided the application allows for the reduced amperage.
Does the Zinsco QC55 include common trip functionality?
Yes, this 2-pole breaker features an internal common trip mechanism. If one pole experiences a fault, both poles will trip simultaneously to disconnect power across the 240V circuit.
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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!