Zinsco QFP24150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Plug-On
Quantity
Zinsco QFP24150 - 150A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to keep aging electrical systems operational, this 150-amp main breaker mounts into legacy Zinsco panelboards. It provides a crucial maintenance solution for facilities looking to avoid costly full-panel replacements. The three-pole plug-on unit is fully compatible with enclosures requiring QFP241503 or UBIZ3150 equivalents. Featuring standard thermal-magnetic trip technology, it delivers 10 kAIC interrupting capacity at 240VAC for dependable circuit defense.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QFP24150-R |
| Series | QFP |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Zinsco Load Centers, 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 Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Main Breaker |
Product FAQs
7 answersWhat panels are compatible with the Zinsco QFP24150 circuit breaker?
This plug-on breaker is designed exclusively for legacy Zinsco load centers and panelboards that accept QFP series main breakers. It is not compatible with modern load centers from other manufacturers.
Are there alternate part numbers or brands for the QFP24150?
Yes, because Zinsco was acquired and rebranded over the years, you may find this exact breaker labeled under Challenger, GTE Sylvania, or Thomas & Betts. Common alternate part numbers include QFP24-150-3, QFL3150, and TBFP24.
What wire size is required for the lugs on the QFP24150?
The load side lug terminals on this 150A breaker accept aluminum or copper wire ranging from 1 AWG to 300 kcmil. Always verify the correct wire gauge based on the conductor material and local electrical codes.
Can I use the QFP24150 in a 120/240V single-phase system?
No, the QFP24150 is a 3-pole breaker intended for three-phase electrical systems up to 240V. For a single-phase system, you would need a 2-pole breaker from the QFP series.
Does the QFP24150 provide ground-fault or arc-fault protection?
No, this is a standard thermal magnetic breaker providing long-time and instantaneous (LI) trip functions for overload and short-circuit protection. It does not include GFCI or AFCI capabilities.
How does the QFP24150 mount into the panel?
This is a plug-on molded case circuit breaker. It snaps directly into the busbar of compatible Zinsco panelboards without the need for bolt-on hardware.
Is the trip unit on the QFP24150 adjustable?
No, this breaker features fixed thermal and fixed magnetic trip settings. It cannot be adjusted in the field to alter the trip curve or amperage rating.
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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.