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Square D QOB3351021 Miniature Circuit Breaker
- 35A
- 3 Pole
- Bolt-On
Square D
QOB3351021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB3351021
Quantity
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Square D QOB3351021 - 35A 3 Pole Miniature Circuit Breaker
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Description
Manufactured by Square D, the QOB3351021 is a three-pole, 35-amp miniature circuit breaker. Designed for commercial and industrial use, it delivers reliable thermal-magnetic protection for branch circuits. This bolt-on unit installs securely into Square D NQ and NQOD panelboards. It accepts 8-2 AWG aluminum or copper wiring via standard box lugs. A key feature is the factory-installed 120/240V AC shunt trip, allowing for remote tripping. It also includes the Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 35A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 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, HACR |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
8 answersWhich panelboards are compatible with the QOB3351021 circuit breaker?
This bolt-on breaker is designed exclusively for use in Square D NQ and NQOD series panelboards. It is not compatible with standard QO load centers, which require plug-on breakers.
What does the 1021 suffix indicate on the QOB3351021?
The 1021 suffix means this breaker includes a factory-installed shunt trip designed to operate at 120V, 208V, or 240V AC. This allows the breaker to be tripped remotely via a control signal.
How many panel spaces does the QOB3351021 require?
Although it is a 3-pole breaker, the factory-installed shunt trip module requires an additional pole space. It will occupy a total of four spaces in your NQ or NQOD panelboard.
What wire sizes are accepted by the terminals on this breaker?
The main breaker box lugs accept 8 AWG to 2 AWG aluminum or copper conductors. The separate shunt trip terminals accept up to two 14 AWG to 12 AWG copper wires.
Is the QOB3351021 suitable for HVAC applications?
Yes, standard QOB thermal-magnetic circuit breakers are HACR rated, making them suitable for use with heating, air conditioning, and refrigeration equipment that requires group motor protection.
How does the Visi-Trip indicator work on this breaker?
When the breaker trips due to an overcurrent or a shunt trip command, the handle moves to a center position and a bright red Visi-Trip indicator appears in the breaker window for quick identification.
Can I field-install a shunt trip on a standard QOB335 breaker instead of buying the QOB3351021?
No. Shunt trips for Square D QO and QOB miniature circuit breakers must be factory-installed. You cannot add a shunt trip to a standard breaker in the field.
Does polarity matter when wiring the shunt trip terminals?
No, the hot and neutral control wires can be connected to either terminal on the factory-installed shunt trip module.
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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