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Square D QOB3251021 Miniature Circuit Breaker
- 25A
- 3 Pole
- Bolt-On
Square D
QOB3251021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB3251021
Quantity
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Square D QOB3251021 - 25A 3 Pole Miniature Circuit Breaker
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Description
Built for commercial applications, the QOB3251021 provides thermal-magnetic protection alongside remote-trip capabilities. The factory-installed shunt trip operates on 120/240VAC control voltage, allowing facility managers to disconnect power from a distance during emergencies. It mounts into Square D NQ and NQOD panelboards using a secure bolt-on connection. Rated for 10kAIC at 120/240VAC, this three-pole breaker features the signature Visi-Trip indicator for rapid fault identification.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 25A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, 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 (120/208/240VAC) |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip |
Product FAQs
6 answersWhat panelboards are compatible with the QOB3251021?
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 breaker?
The 1021 suffix indicates that this breaker includes a factory-installed AC shunt trip. This allows the breaker to be tripped remotely using a 120V to 240V AC control signal, which is commonly used for emergency stop applications.
What type of wire connections does the QOB3251021 accept?
It features pressure plate terminals that accept 14 AWG to 8 AWG aluminum or copper wire.
How is this breaker mounted into the panel?
The QOB3251021 uses a bolt-on connection, securing directly to the busbar of compatible NQ or NQOD panelboards for a reliable, vibration-resistant installation.
Does this breaker provide a visual indication when it trips?
Yes, it features the Square D Visi-Trip indicator. When the breaker trips, a highly visible red indicator appears, allowing for rapid fault identification in the panelboard.
Can I use a QO3251021 instead of the QOB3251021?
No. While they share the same electrical ratings and shunt trip feature, the QO3251021 is a plug-on breaker for QO load centers, whereas the QOB3251021 is a bolt-on breaker specifically for NQ and NQOD panelboards. They are not interchangeable.
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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