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Square D QOB230-1021 QOB2301021 - 30A 2 Pole Miniature Circuit Breaker
- 30A
- 2 Pole
- Bolt-On
Square D
QOB230-1021
QOB2301021 - 30A 2 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB230-1021
Quantity
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Square D QOB2301021 - 30A 2 Pole Miniature Circuit Breaker
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Square D QOB2301021 - 30A 2 Pole Miniature Circuit Breaker
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| Brand | Square D |
|---|---|
| Part Number | QOB2301021 |
| Series | QOB |
| Amperage | 30A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| 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 (Factory Installed) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Sold out
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Square D QOB2301021 - 30A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB2301021-R |
| Series | QOB |
| Amperage | 30A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| 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 (Factory Installed) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
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Description
Engineered for remote tripping applications, the Square D QOB230-1021 features a factory-installed 120V AC shunt trip mechanism. This 2-pole, 30A miniature circuit breaker delivers a 10kAIC rating at 120/240VAC for commercial and industrial facilities. The bolt-on design installs into NQ and NQOD panelboards, providing a secure connection that resists vibration. Alongside the shunt trip functionality, it includes the Visi-Trip indicator for clear visual confirmation of tripped status.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB2301021-R |
| Series | QOB |
| Amperage | 30A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| 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 (Factory Installed) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
6 answersHow many panel spaces does the QOB230-1021 require?
This breaker requires three panel spaces. While it is a 2-pole breaker, the factory-installed shunt trip accessory occupies one additional pole space in the panelboard.
What does the -1021 suffix indicate on this QOB circuit breaker?
The -1021 suffix signifies that the breaker is equipped with a factory-installed 120/240VAC shunt trip. This accessory allows the breaker to be tripped remotely via an external control signal, which is commonly used for emergency stops or automated control systems.
Can I install the QOB230-1021 in a standard QO load center?
No. The QOB230-1021 is a bolt-on circuit breaker designed exclusively for Square D NQ and NQOD panelboards. For a standard plug-on QO load center, you would need the QO230-1021 instead.
What wire sizes are compatible with the terminals on this 30A breaker?
The pressure plate terminals are rated for both aluminum and copper conductors, accepting wire sizes from 14 AWG to 8 AWG.
How can I visually verify if the QOB230-1021 has tripped?
This breaker features the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent, short circuit, or a remote shunt trip signal, the handle moves to the center position and a highly visible red indicator appears in a small window.
Is the QOB230-1021 rated for direct current (DC) applications?
Yes. In addition to its standard AC ratings, this thermal-magnetic breaker is rated for use on 48VDC systems with a 5 kAIC interrupting capacity.
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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.