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Square D QOB2251021 Miniature Circuit Breaker
- 25A
- 2 Pole
- Bolt-On
Square D
QOB2251021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB2251021
Quantity
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Square D QOB2251021 - 25A 2 Pole Miniature Circuit Breaker
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Description
Engineered for commercial electrical systems, the Square D QOB2251021 delivers reliable overcurrent protection. This 25A, two-pole miniature circuit breaker features a thermal-magnetic trip mechanism and a 10kAIC rating at 120/240VAC. This unit installs into Square D NQ and NQOD panelboards. The bolt-on mounting style ensures a secure, vibration-resistant connection to the busbar. A factory-installed shunt trip allows the breaker to be opened remotely.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 25A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, RoHS Compliant |
Product FAQs
6 answersWhat panelboards are compatible with the QOB2251021 circuit breaker?
This bolt-on miniature circuit breaker is designed for use in Square D NQ and NQOD panelboards.
What does the 1021 suffix mean on this Square D breaker?
The 1021 suffix indicates that the breaker includes a factory-installed 120/208/240VAC shunt trip accessory, which allows the breaker to be tripped remotely.
How many panel spaces does the QOB2251021 require?
Because it is a two-pole breaker with a factory-installed shunt trip accessory, it requires three total panel spaces for installation.
Is the QOB2251021 HACR rated?
Yes, this thermal-magnetic circuit breaker is HACR rated, making it suitable for group motor applications like heating, air conditioning, and refrigeration equipment.
Does this breaker feature a tripped circuit indicator?
Yes, it features the Square D Visi-Trip indicator. When the breaker trips, the handle moves to a center position and a red indicator appears in a window on the case for quick identification.
How does the trip mechanism operate on this two-pole breaker?
It utilizes a common trip, thermal-magnetic mechanism. An overcurrent on either pole will cause both poles to open simultaneously.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 205 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
205 reviews
- 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.
- RKRyan K.Verified BuyerReviewingSquare D QOB230VH - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26Awesome
Worked great