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Square D QOB125-1021 QOB1251021 - 25A 1 Pole Miniature Circuit Breaker
- 25A
- 1 Pole
- Bolt-On
Square D
QOB125-1021
QOB1251021 - 25A 1 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB125-1021
Quantity
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Square D QOB1251021 - 25A 1 Pole Miniature Circuit Breaker
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Description
A versatile solution for commercial systems, the Square D QOB125-1021 is a single-pole, 25-amp miniature circuit breaker. It provides thermal-magnetic overload and short-circuit protection. This unit is designed to install into Square D NQ and NQOD panelboards via a sturdy bolt-on connection. It accepts 14-8 AWG wire sizes. Rated for 10kAIC at 120/240VAC, this breaker features a factory-installed shunt trip for remote operation and a Visi-Trip indicator for fast fault identification.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 25A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| 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 | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | UL 489, CSA C22.2 No. 5, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat does the -1021 suffix indicate on the QOB125-1021?
The -1021 suffix denotes a factory-installed shunt trip accessory. This allows the breaker to be tripped remotely via a control signal operating at 120V to 240V AC.
How many panel spaces are required to mount the QOB125-1021?
This unit requires two panel spaces. The single-pole breaker occupies one space, and the attached shunt trip module requires an adjacent space.
Can the QOB125-1021 be installed in a standard QO residential load center?
No. The QOB series utilizes a bolt-on mounting mechanism designed specifically for commercial NQ and NQOD panelboards. Standard QO load centers require plug-on breakers.
How do I wire the shunt trip module on this breaker?
The shunt trip module has two dedicated terminals. To enable remote tripping, connect a 120V to 240V AC control voltage circuit to these terminals. When energized, the module will mechanically trip the breaker.
How can I quickly identify if the QOB125-1021 has tripped?
This breaker features the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent event or a remote shunt trip signal, a highly visible red indicator appears in the breaker window.
What is the plug-on equivalent of the QOB125-1021?
For applications requiring a plug-on connection, such as standard QO load centers, the equivalent breaker is the Square D QO125-1021.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 212 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
212 reviews
- SJSheldon J. H.Verified BuyerReviewingSquare D QOB240 - 40A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/12/26Installer
Good price, worked great.
- MLMike L.Verified BuyerReviewingSquare D QOB250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/9/26breaker orders
Breaker worked out great
Can not be happier with the quick shipping
- RCRichard C.Verified BuyerReviewingSquare D QOB380 - 80A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/7/26Great price quick turn around
Thank you for getting me the breaker in a timely fashion
- DSDarren S.Verified BuyerReviewingSquare D QOB250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/5/26Airport taxi lighting
After contactor replacement we discovered bad breakers and were able to get replacements from Super Breakers in 2 days. THANK YOU SUPER BREAKERS..
- MRMiguel R.Verified BuyerReviewingSquare D QOB220GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/1/26Excellent
Excellent product and service