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Square D QOB330-1021 QOB3301021 - 30A 3 Pole Miniature Circuit Breaker
- 30A
- 3 Pole
- Bolt-On
Square D
QOB330-1021
QOB3301021 - 30A 3 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB330-1021
Quantity
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Square D QOB3301021 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB3301021 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB3301021 |
| Series | QOB |
| Amperage | 30A |
| 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 |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Square D QOB3301021 - 30A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB3301021-R |
| Series | QOB |
| Amperage | 30A |
| 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 |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
Built for commercial and industrial systems, the Square D QOB330-1021 is a 3-pole, 30A breaker. It includes a factory-installed shunt trip, allowing remote tripping via a 120/240VAC control circuit. This device features a secure bolt-on mounting style, making it fully compatible with Square D NQ and NQOD panelboards. The bolt-on design ensures a stable connection in demanding environments.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB3301021 |
| Series | QOB |
| Amperage | 30A |
| 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 |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat does the -1021 suffix mean on the QOB3301021 circuit breaker?
The -1021 suffix indicates that this breaker includes a factory-installed 120/240VAC shunt trip accessory. This allows the breaker to be tripped remotely via a separate control circuit, which is often required for emergency stop or automated shutdown systems.
Can I install the QOB3301021 in a standard QO residential load center?
No. The QOB3301021 is a bolt-on circuit breaker designed specifically for Square D NQ and NQOD commercial panelboards. Standard QO load centers require plug-on breakers.
What is the plug-on equivalent of the QOB3301021?
If you need a 30-amp, 3-pole breaker with a 120/240VAC shunt trip for a plug-on QO load center, the correct catalog number is QO3301021.
Does this breaker provide visual trip indication?
Yes. It features the Square D Visi-Trip indicator, which displays a highly visible red flag when the breaker has tripped due to an overload or short circuit. This makes it easy to identify the faulted circuit in a crowded panelboard.
What type of wire is compatible with the terminals on this breaker?
The pressure plate terminals are rated for both aluminum and copper conductors, accepting wire sizes from 14 AWG to 8 AWG. Ensure terminals are torqued to the specifications printed on the breaker label to prevent arcing or overheating.
How does the thermal-magnetic trip mechanism operate?
The thermal-magnetic mechanism provides two types of protection. The thermal element offers long-time protection against gradual overloads, while the magnetic element provides instantaneous protection against severe short circuits.
Can this breaker be used in DC applications?
Yes, the QOB3301021 is rated for use in DC systems up to 48VDC, where it provides an interrupting capacity of 5kAIC. This makes it suitable for specific control panel or battery-backed applications.
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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