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Zinsco QC40 Molded Case Circuit Breaker
- 40A
- 2 Pole
- Plug-On
Zinsco
QC40
Molded Case Circuit Breaker
Brand
Zinsco
SKU
QC40
Quantity
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Zinsco QC40 - 40A 2 Pole Molded Case Circuit Breaker
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Description
Restoring older electrical systems requires precise component matching, and this 40A unit delivers exact fitment for vintage residential setups. It provides reliable thermal-magnetic protection for 240V circuits in homes utilizing older infrastructure. This plug-on component installs into original Zinsco and Sylvania load centers without modification. For modern alternatives, the UBIZ240 serves as a recognized substitute. Featuring a 10kAIC rating, it meets standard residential requirements.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QC40-R-R |
| Amperage | 40A |
| 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 |
| 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 answersWhat load centers are compatible with the Zinsco QC40?
The QC40 is designed specifically for use in legacy Zinsco and GTE Sylvania load centers that accept Type QC plug-on circuit breakers.
How much panel space does the QC40 require?
As a thick series breaker with a 1.5-inch body, the QC40 requires two standard 3/4-inch spaces in a compatible load center.
What is the Connecticut Electric cross-reference for the Zinsco QC40?
Connecticut Electric manufactures a modern, ETL-listed replacement for this breaker under the catalog number UBIZ240 or UBIZ240-1.
Are there known safety issues with legacy Zinsco circuit breakers?
Yes. Legacy Zinsco breakers and panels have a documented history of safety hazards, including breakers failing to trip during overloads, internal components welding to the bus bar, and severe corrosion. These issues can lead to arcing and electrical fires.
Is it safe to install a replacement breaker in an old Zinsco panel?
While replacement breakers are available, many licensed electricians and home inspectors recommend upgrading the entire Zinsco panel to a modern system. The original panel bus bars are prone to corrosion and poor connections, which can compromise the safety of the installation even with a new breaker.
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