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Square D QOB315-1021 QOB3151021 - 15A 3 Pole Miniature Circuit Breaker
- 15A
- 3 Pole
- Bolt-On
Square D
QOB315-1021
QOB3151021 - 15A 3 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB315-1021
Quantity
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Square D QOB3151021 - 15A 3 Pole Miniature Circuit Breaker
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Description
Engineered for commercial and industrial environments, this three-pole miniature circuit breaker provides reliable thermal-magnetic protection. The inclusion of a factory-installed shunt trip allows for remote tripping capabilities. It mounts securely into Square D NQ and legacy NQOD panelboards using a standard bolt-on connection. Rated for 10kA interrupting capacity at 240VAC, the unit features the signature Visi-Trip indicator for rapid fault identification and is fully HACR rated.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB315-1021 |
| Series | QOB |
| Amperage | 15A |
| 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 | Square D NQ Panelboards, Square D 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), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
7 answersWhat does the -1021 suffix indicate on the QOB315-1021 circuit breaker?
The -1021 suffix denotes that this breaker includes a factory-installed shunt trip accessory rated for 120, 208, or 240 VAC. This allows the breaker to be tripped remotely using a control circuit or emergency stop button.
How many panel spaces are required to install the QOB315-1021?
Because it includes a factory-installed shunt trip accessory, this 3-pole breaker requires four pole spaces in the panelboard. The accessory occupies one additional space alongside the three poles used for the breaker itself.
Which panelboards are compatible with the QOB315-1021 circuit breaker?
This bolt-on breaker is designed 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 wire sizes are accepted by the terminals on the QOB315-1021?
The pressure plate terminals on this breaker accept 14 AWG to 8 AWG copper or aluminum wire.
Can the QOB315-1021 be used in systems with a 22kA available fault current?
This breaker has a maximum interrupting rating of 10kA at 120/240VAC. If your system has a higher available fault current, it can only be installed if it is part of a tested series rating with an upstream main breaker that permits its application.
How is the shunt trip wired on the QOB315-1021?
The factory-installed shunt trip features pigtail leads that must be connected to a separate control circuit. When the control circuit energizes the coil with 120V to 240V AC, it mechanically trips the breaker to open the contacts.
What type of protection does the thermal magnetic trip unit provide?
The thermal magnetic mechanism provides fixed long time and instantaneous trip functions. The thermal element protects against sustained overloads, while the magnetic element provides instantaneous tripping during short circuit events.
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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.