Square D QO3251021 Miniature Circuit Breaker
- 25A
- 3 Pole
- Plug-On
Square D
QO3251021
Miniature Circuit Breaker
Brand
Square D
SKU
QO3251021
Quantity
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Square D QO3251021 - 25A 3 Pole Miniature Circuit Breaker
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Description
Designed for specialized control applications, this 25A three-pole breaker integrates a factory-installed shunt trip accessory. The 120/208/240VAC shunt mechanism enables remote tripping capabilities for emergency shutdown systems. The plug-on design fits Square D QO load centers, NQ, and NQOD panelboards. It occupies additional pole space due to the integrated accessory. Alongside remote operation, the breaker includes Square D's signature Visi-Trip red indicator flag for quick diagnostics.Specifications
| Brand | Square D |
|---|---|
| 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 |
| Frame Type | QO |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | QO Load Centers, 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 | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
9 answersWhich load centers and panelboards are compatible with the QO3251021?
This plug-on circuit breaker is designed for use in Square D QO load centers, as well as NQ and legacy NQOD panelboards.
What does the 1021 suffix indicate on the QO3251021 circuit breaker?
The 1021 suffix designates that this breaker includes a factory-installed 120/240VAC shunt trip accessory, which allows for remote tripping of the breaker.
How do I wire the shunt trip on the QO3251021?
The factory-installed shunt trip features two terminals that accept 14 to 12 AWG copper wires. The hot and neutral control wires can be connected to either terminal.
Does the shunt trip accessory require additional panel space?
Yes, the factory-installed shunt trip adds one additional pole space to the overall width of the circuit breaker, meaning this 3-pole breaker will require four pole spaces in the panel.
Can I field-install a shunt trip on a standard QO 25A 3-pole breaker?
No, shunt trips for QO series breakers must be factory-installed. You must order the breaker with the 1021 suffix if you require a 120/240VAC shunt trip.
What control voltage is required to operate the shunt trip on this breaker?
The shunt trip coil on the QO3251021 is rated for 120VAC, 208VAC, or 240VAC control voltage.
What is the conductor temperature rating for the QO3251021?
This 25A circuit breaker is suitable for use with 60 degrees C or 75 degrees C rated conductors.
Is the QO3251021 suitable for HVAC applications?
Yes, this breaker is HACR rated, making it suitable for use with air conditioning, heating, and refrigeration equipment that requires HACR type circuit breakers.
What is the bolt-on equivalent of the QO3251021?
The QOB3251021 is the bolt-on version of this breaker, designed for use in Square D NQ and NQOD panelboards that require bolt-on connections.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 289 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
289 reviews
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I am completely satisfied and will utilize this component resource for my future electrical needs.
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I could not find the breaker in hardwood stores. Superbreakers took car of it in a week.