Eaton / Challenger QFB125-2 Molded Case Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Eaton / Challenger
QFB125-2
Molded Case Circuit Breaker
Brand
Eaton / Challenger
SKU
QFB125-2
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Eaton / Challenger QFB125-2 - 125A 2 Pole Molded Case Circuit Breaker
New
Quantity
Similar Items
125A 2 Pole Molded Case Circuit Breaker
Eaton / Cutler-HammerEGS2125FFB
125A 2 Pole Molded Case Circuit Breaker
125A 2 Pole Molded Case Circuit Breaker
Description
Built to restore aging electrical systems, this two-pole 125A molded case circuit breaker offers a seamless fit for classic Zinsco and Sylvania panelboards. It eliminates the need for retrofitting by matching the original bolt-on mounting configuration of discontinued QFB frames. Delivering standard 10kA interrupting capacity at 240VAC, the unit ensures code-compliant thermal-magnetic protection for commercial applications and serves as a reliable alternative to UBIZ2125B substitutes.Specifications
| Brand | Eaton / Challenger |
|---|---|
| Part Number | QFB125-2 |
| Series | QFB |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Zinsco Panelboards |
| Wire Gauge | 4 AWG - 2/0 AWG |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
7 answersWhat panels are compatible with the QFB125-2 circuit breaker?
This breaker is designed as a direct replacement for classic Zinsco, Sylvania, and Challenger panelboards that accept QFB frame bolt-on breakers.
Can I use the QFB125-2 to replace a UBIZ2125B breaker?
Yes, the QFB125-2 serves as a reliable, code-compliant alternative to UBIZ2125B aftermarket substitutes for Zinsco panels.
What wire sizes does the QFB125-2 accept?
The load side lugs on this breaker accommodate wire gauges ranging from 4 AWG up to 2/0 AWG.
How does the QFB125-2 mount into the panel?
It features a bolt-on mounting configuration that matches the original design of discontinued QFB frames, eliminating the need for retrofitting.
What type of trip unit does the QFB125-2 use?
It features a thermal-magnetic trip unit with fixed long-time and instantaneous (LI) trip functions for standard commercial applications.
Is the QFB125-2 HACR rated?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment.
Is the QFB125-2 UL listed?
Yes, this breaker is UL approved and meets UL 489 standards for molded case circuit breakers.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Search
Rating
2 reviews
- RFRuss F.Verified BuyerReviewingMilbank UQFB-150 2 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars6/26/26Breaker Purchase
This product arrived very quickly...in one day!
It was advertised and was installed successfully
- DDdaniel d.Verified BuyerReviewingMilbank UQFB-150 2 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars3/4/26good
fits perfectly in the 320 we have. no problems