Zinsco QFP100-2 Molded Case Circuit Breaker
- 100A
- 2 Pole
- Plug-On
Quantity
Zinsco QFP100-2 - 100A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Restoring functionality to legacy systems, the QFP100-2 is a 100A main breaker engineered for Zinsco residential and commercial panelboards. It provides a straightforward solution for maintaining older electrical infrastructure. This plug-on breaker mounts seamlessly into original Zinsco load centers and can be substituted with the UBITBFP1002. Delivering 10kAIC interrupting capacity at 120/240VAC, it features fixed thermal-magnetic trip technology for dependable circuit protection.Specifications
| Brand | Zinsco |
|---|---|
| Series | QFP |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | QFP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Zinsco Panelboards |
| Wire Gauge | 1 AWG - 300 kcmil |
| Max Wire | 300 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Main Breaker |
Product FAQs
5 answersWhat panelboards accept the Zinsco QFP100-2?
This 100A main breaker is designed exclusively for legacy Zinsco and Challenger load centers that require a QFP frame.
What is the direct aftermarket replacement for the Zinsco QFP100-2?
The Connecticut Electric UBITBFP1002 is the direct aftermarket replacement. It is engineered to fit the same legacy Zinsco panelboards and provides identical 100A overcurrent protection.
Are there known safety issues with original Zinsco circuit breakers?
Yes. Legacy Zinsco panels and breakers have a documented history of failing to trip during overcurrent conditions and experiencing busbar arcing. Electricians often recommend a complete panel upgrade to meet current safety codes, though replacement breakers are available for maintaining existing systems.
How does the QFP100-2 connect to the panel busbar?
The QFP100-2 features a plug-on mounting design. It presses directly onto the busbars in compatible Zinsco load centers without requiring bolt-on hardware.
What wire gauge range do the terminals on the QFP100-2 accept?
The load lugs on this breaker accommodate wire sizes from 1 AWG up to 300 kcmil.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
- KYKathleen Y.Verified BuyerReviewingMilbank UQFP-100 2 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars1/1/26Milbank 100 2 Pole Circuit Breaker
Product arrived on time, well packaged and exactly what we needed.
Jake was extremely helpful and courteous. You don’t find that too often these days. Will spread the word and recommend your company to all that require your service.
Thank you and Happy New Year
Sincerely,
K. Young
- QAquinlan a.Verified BuyerReviewingZinsco QFP2200T - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/26/25Great communication and customer service
Ordered QFP2200T breaker and paid to ship overnight. Reached out to company when breaker did not arrive on time. Although I did not get the breaker when expected, they did communicate the situation, refunded my shipping and expedited the breaker to me once it was ready for shipping. They handled the situation in the best possible way given the circumstances.
Would buy from them again.
-Quinlan (Q-Extra Electrical Services)
- ARAized R.ReviewingZinsco QFP2200T - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/7/21Excellent service!
I needed an obsolete part. They had it and sent it. Turned out it was the wrong part. Their customer service made up for it. They sent the correct part overnight and also sent a free ups label to return the wrong part. Great service! Highly recommend. And the refurbished part looked like it was in great shape.