Square D QOB250H Miniature Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Square D
QOB250H
Miniature Circuit Breaker
Brand
Square D
SKU
QOB250H
Quantity
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Square D QOB250H - 50A 2 Pole Miniature Circuit Breaker
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Description
Part of the QO family, the QOB250H is a 50A, two-pole miniature circuit breaker designed for commercial and industrial applications. Unlike standard 120/240V models, this unit carries a straight 240VAC rating, making it suitable for specific three-phase or delta system configurations where required. The breaker mounts into Square D NQ and NQOD panelboards using a secure bolt-on connection. It features a 10kAIC interrupt capacity and includes the Visi-Trip visual indicator.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | None included |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat panelboards are compatible with the QOB250H circuit breaker?
The QOB250H is a bolt-on breaker designed specifically for use in Square D NQ and NQOD panelboards. It cannot be installed in Homeline panels or standard QO load centers.
Can I install the QOB250H in a standard QO load center?
No. The QOB250H features a bolt-on mounting connection intended for commercial panelboards. Standard QO load centers require plug-on breakers from the QO series.
What is the recommended tightening torque for the QOB250H terminals?
The box lugs on the QOB250H should be torqued to 44.25 lb-in (5 N.m) when securing the required 8 AWG to 2 AWG copper or aluminum conductors.
Does the QOB250H include a tripped circuit indicator?
Yes, it is equipped with the Square D Visi-Trip visual indicator. When the breaker trips, the handle snaps to a midpoint position and a highly visible red flag appears in the window to help you quickly identify the faulted circuit.
Is the QOB250H rated for use with HVAC equipment?
Yes, this breaker is HACR rated. It is approved for use with heating, air conditioning, and refrigeration equipment that requires a breaker marked for HACR applications.
What is the difference between the QO and QOB breaker series?
The primary difference is the mounting style. QO breakers are plug-on units typically used in residential load centers. QOB breakers, such as the QOB250H, feature a secure bolt-on connection designed for commercial NQ and NQOD panelboards. The internal thermal-magnetic trip mechanisms are identical.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 206 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 3/11/26
Customers say these electrical breakers arrive exactly as ordered and work perfectly for their intended applications. They consistently praise the competitive pricing, which many report is significantly lower than local suppliers. Fast shipping and prompt delivery are frequently highlighted, with many receiving orders within days or even next-day delivery for urgent needs. The breakers arrive well-packaged and in excellent condition. Many reviews emphasize the company's extensive inventory availability, particularly for hard-to-find breakers. One customer experienced difficulty with order cancellation and was charged a restocking fee, which caused dissatisfaction.
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Rating
206 reviews
- KHKristopher H.Verified BuyerReviewingSquare D QOB120GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/28/26Great Price!
Great price. Fast delivery. My local electric distributor wanted double for the same breaker, so it was a no brainer to order this one. Ordered another one since with the same great service.
- BLBOOSTIX L.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/17/26QOB220
That's nice breakers!
- PHPaul H.Verified BuyerReviewingSquare D QOB330 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Quick shipping and delivery
Shipped and delivered on time for installation at one of our projects. Thank you!
- RMRick M.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Project Mgr
Just what I needed.
- DHDoug H.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Square D QOB breakers
As always, our order arrived timely, and accurate. You can’t beat their prices that’s why we have used this company for years.