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Square D QOB3201021 Miniature Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Square D
QOB3201021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB3201021
Quantity
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Square D QOB3201021 - 20A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB3201021 - 20A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB3201021 |
| Series | QOB |
| Amperage | 20A |
| 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 (Cu/Al) |
| 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, UL 489, NEMA AB 1, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Quick-Make/Quick-Break, Trip-Free Mechanism |
Sold out
Quantity
Square D QOB3201021 - 20A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB3201021-R |
| Series | QOB |
| Amperage | 20A |
| 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 (Cu/Al) |
| 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, UL 489, NEMA AB 1, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Quick-Make/Quick-Break, Trip-Free Mechanism |
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Description
Designed for advanced control applications, the Square D QOB3201021 is a 20-amp, three-pole miniature circuit breaker equipped with a factory-installed shunt trip. This 120/208/240VAC accessory enables remote tripping of the breaker for emergency shutdowns or automated control schemes. The unit features a secure bolt-on mounting style compatible with Square D NQ and NQOD panelboards. Rated for 10 kAIC at 120/240V, it provides reliable thermal-magnetic protection and Visi-Trip indication.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB3201021 |
| Series | QOB |
| Amperage | 20A |
| 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 (Cu/Al) |
| 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, UL 489, NEMA AB 1, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Quick-Make/Quick-Break, Trip-Free Mechanism |
Product FAQs
7 answersWhat function does the 1021 suffix provide on this breaker?
The 1021 suffix indicates the inclusion of a factory-installed 120/240VAC shunt trip. This allows the breaker to be tripped remotely via an external control signal, which is commonly used in emergency stop or automated shutdown circuits.
Will the QOB3201021 fit in a standard Square D QO residential load center?
No. The QOB3201021 is a bolt-on circuit breaker designed exclusively for commercial NQ and NQOD series panelboards. It does not have the plug-on mounting clips required for standard QO load centers.
What is the difference between the QOB320 and QOB3201021 catalog numbers?
While both are 20A, 3-pole bolt-on breakers, the QOB3201021 features an integrated 120/240VAC shunt trip for remote shutdown capabilities. The standard QOB320 does not include this factory-installed accessory.
What type of wire is approved for the QOB3201021 terminals?
The factory-installed pressure plate terminals are rated for either copper or aluminum conductors ranging from 14 AWG to 8 AWG. Always verify local code requirements and panel torque specifications when terminating conductors.
Can the QOB3201021 be used in direct current systems?
Yes. In addition to its AC ratings, this thermal-magnetic breaker carries a 48VDC rating with a 5 kA interrupting capacity, making it suitable for select low-voltage DC control circuits.
What type of trip mechanism does the QOB3201021 use?
It utilizes a non-interchangeable, fixed thermal-magnetic trip unit. This provides both long-time inverse-time overload protection and instantaneous short-circuit protection.
Does this breaker include a tripped status indicator?
Yes. Like most QO and QOB circuit breakers, it features Square D's Visi-Trip indicator. When the breaker trips due to a fault or the shunt trip being activated, a highly visible red indicator appears in the window, allowing you to quickly identify the tripped breaker.
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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