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Square D QO325-1021 QO3251021 - 25A 3 Pole Miniature Circuit Breaker
- 25A
- 3 Pole
- Plug-On
Square D
QO325-1021
QO3251021 - 25A 3 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QO325-1021
Quantity
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Square D QO3251021 - 25A 3 Pole Miniature Circuit Breaker
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Description
Engineered for remote shutdown capabilities, this 25-amp model incorporates a factory-installed shunt trip mechanism alongside standard thermal-magnetic protection. Facility managers can wire the accessory to emergency stop buttons or fire alarm systems to cut power instantly when required. The unit installs into QO load centers, NQ, and legacy NQOD panelboards. A 10kAIC rating ensures reliable fault clearing while the Visi-Trip flag provides immediate visual confirmation of circuit status.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO325-1021 |
| Series | QO |
| Amperage | 25A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Terminal Type | Pressure Plate |
|---|---|
| For Use With | QO Load Centers, 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 | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhich panelboards and load centers accept the QO325-1021 breaker?
This plug-on breaker is compatible with Square D QO load centers, as well as NQ and legacy NQOD panelboards. It is not compatible with Homeline or I-Line panels.
What does the -1021 suffix indicate on the QO325-1021 catalog number?
The -1021 suffix designates a factory-installed shunt trip accessory. This allows the breaker to be tripped remotely via a 120/208/240VAC control signal, which is commonly used for emergency shutdowns or fire alarm integration.
How many pole spaces does the QO325-1021 require in a panel?
Because it includes a factory-installed shunt trip accessory, this 3-pole breaker requires four total pole spaces in a QO load center or NQ panelboard.
What wire sizes and materials are accepted by the QO325-1021 terminals?
The pressure plate terminals are dual-rated for both copper and aluminum conductors, accepting wire sizes from 14 AWG to 8 AWG.
Is the QO325-1021 rated for use in DC electrical systems?
Yes, this breaker is UL Listed for DC applications up to 48VDC, providing a 5kA interrupting rating (5kAIC) for those systems.
Is the QO325-1021 suitable for HVAC applications?
Yes, this breaker is HACR rated, making it approved for use with heating, air conditioning, and refrigeration equipment.
How does the Visi-Trip indicator work on the QO325-1021?
When the breaker trips due to an overcurrent or a remote shunt trip signal, the handle snaps to a center position and a high-visibility red flag appears in the indicator window, allowing for rapid fault identification in a crowded panel.
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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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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 286 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 6/13/26
Customers say these circuit breakers arrive quickly and work as described. Fast shipping and competitive pricing are frequently mentioned, with many noting same-day or next-day delivery. Users appreciate the wide inventory, particularly for hard-to-find older-style models unavailable locally. The products function reliably and arrive in good condition. Most customers report straightforward ordering and positive interactions. However, some experienced delivery delays or received incorrect items requiring reordering. A few noted concerns about condition upon arrival or customer service responsiveness.
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Rating
286 reviews
- RBRobert B.Verified BuyerReviewingSquare D QO120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/5/26Square D Q0120-20A circuit breaker
This device was delivered on time as advertised and it was in excellent condition. The installation process was simple and straightforward, and the unit worked perfectly when connected to the electric circuit.
I am completely satisfied and will utilize this component resource for my future electrical needs.
- GCGerard C.Verified BuyerReviewingSquare D QO130GFI - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/21/26Great !
I could not find the breaker in hardwood stores. Superbreakers took car of it in a week.
- RHRoy H.Verified BuyerReviewingSquare D QO280 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/17/26Square D QO280 - 80A 2 Pole Miniature Circuit Breaker
Exactly as described
- KWKevin W.Verified BuyerReviewingSquare D QO120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/15/26Great Price
Brand spanking new!
- CEchristopher e.Verified BuyerReviewingSquare D QO115PDF - 15A Dual Function Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26My breakers
Had a hard time locating these breakers locally, when I did find 1 they wanted to charge me triple what superbreakers charged. Items delivered exactly when they said they would, were exactly what I ordered. Appreciated the ease of ordering, definitely my go to from this point on