Zinsco QFP175-2 Molded Case Circuit Breaker
- 175A
- 2 Pole
- Plug-On
Quantity
Zinsco QFP175-2 - 175A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Providing critical overcurrent safety, the QFP175-2 functions as a 175A main breaker for legacy Zinsco load centers. It ensures proper panel sizing for residential or commercial electrical services. The two-pole plug-on design allows for straightforward installation into existing Zinsco enclosures. For modern upgrades, this specific frame is commonly replaced by the UBITBFP1752 substitute. Delivering a 10kAIC rating at 120/240VAC, it utilizes fixed thermal-magnetic trip technology.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QFP175-2 |
| Series | QFP |
| Amperage | 175A |
| 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 Load Centers |
| 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 answersWhich load centers accept the QFP175-2 circuit breaker?
This plug-on breaker is specifically designed for use as a main breaker in legacy Zinsco electrical panels that accommodate the QFP frame size. It is not compatible with modern panels from other manufacturers.
What is the Connecticut Electric replacement for the Zinsco QFP175-2?
Connecticut Electric manufactures a modern, safety-tested replacement for this 175A main breaker under the catalog number UBITBFP1752.
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 events. When servicing these systems, many licensed electricians recommend either a complete panel upgrade or installing modern replacement breakers that meet current safety standards.
Does the QFP175-2 have an adjustable trip setting?
No, this breaker features a fixed thermal magnetic trip unit. The Long-Time and Instantaneous trip functions are factory set and cannot be adjusted in the field.
Can the QFP175-2 be used as a branch breaker?
No, the QFP frame is specifically configured to function as a main breaker in Zinsco load centers. It is not designed or rated for use as a standard branch circuit breaker.
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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.