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Square D QOB310 Miniature Circuit Breaker
- 10A
- 3 Pole
- Bolt-On
Square D
QOB310
Miniature Circuit Breaker
Brand
Square D
SKU
QOB310
Quantity
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Square D QOB310 - 10A 3 Pole Miniature Circuit Breaker
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Description
Engineered for three-phase commercial applications, this 10A miniature circuit breaker provides dependable thermal-magnetic protection against overloads and short circuits. It installs securely into Square D NQ and NQOD panelboards, utilizing a bolt-on mounting configuration to ensure a stable connection under load. Rated for 10kA interrupting capacity at 240V, the unit incorporates the signature Visi-Trip red indicator flag to help facility managers quickly locate tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 10A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Visi-Trip Indicator |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, RoHS, UL 489 |
| Approval | ANCE, CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Mercury Free, RoHS Compliant |
Product FAQs
6 answersAre QO and QOB circuit breakers interchangeable?
No. The QOB310 is a bolt-on breaker designed specifically for Square D NQ and NQOD panelboards. Standard QO breakers use a plug-on mounting style for residential and commercial load centers. They cannot be swapped.
Is the QOB310 suitable for HVAC equipment?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific overcurrent protection designation.
What is the DC interrupting rating for the QOB310?
When applied on a 48VDC system, this thermal-magnetic circuit breaker has an interrupting rating of 5kAIC.
How can I visually identify if the QOB310 has tripped?
This breaker features Square D Visi-Trip technology. A bright red indicator flag appears in the breaker window when it trips due to an overload or short circuit, allowing for rapid identification in a crowded panelboard.
What type of trip mechanism does the QOB310 use?
It utilizes a fixed thermal-magnetic trip mechanism. The thermal component provides long-time delay protection against overloads, while the magnetic component provides instantaneous protection against short circuits.
Does the QOB310 provide GFCI or AFCI protection?
No, this is a standard thermal-magnetic circuit breaker providing only overload and short-circuit protection. It does not include ground-fault or arc-fault circuit interruption capabilities.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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