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Square D QO330 Miniature Circuit Breaker
- 30A
- 3 Pole
- Plug-On
Square D
QO330
Miniature Circuit Breaker
Brand
Square D
SKU
QO330
Quantity
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Square D QO330 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
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Square D QO330 - 30A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QO330 |
| Series | QO |
| Amperage | 30A |
| 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, Speed-D Switchboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip |
Sold out
Quantity
Square D QO330 - 30A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QO330-R |
| Series | QO |
| Amperage | 30A |
| 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, Speed-D Switchboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip |
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Description
Built to handle 30-amp three-phase loads, this miniature circuit breaker delivers reliable overcurrent protection for commercial and industrial environments. The internal common trip mechanism ensures an overload on any phase opens all three poles. Compatibility spans across Square D platforms, including QO load centers, NQOD panelboards, and Speed-D switchboards. Rated for 10kA interrupting capacity at 240VAC, the unit features the highly visible Visi-Trip indicator for rapid diagnostics.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO330 |
| Series | QO |
| Amperage | 30A |
| 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, Speed-D Switchboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip |
Product FAQs
7 answersWhat panels are compatible with the QO330 circuit breaker?
It is designed for use in Square D QO Load Centers, NQ Panelboards, NQOD Panelboards, and Speed-D Switchboards. Ensure you have 3 full adjacent panel spaces available for this 3-pole plug-on breaker.
Can the QO330 be used for DC voltage applications?
Yes, this thermal magnetic breaker is rated for use on 48V DC systems with a 5kA interrupting capacity. This is in addition to its standard 10kAIC rating at 120/240V AC.
What wire gauges and conductor materials are accepted by the terminals?
The pressure plate terminals accept 14 AWG to 8 AWG conductors. Both copper (Cu) and aluminum (Al) wire can be safely terminated. Always refer to the breaker labeling for proper tightening torque based on your specific wire gauge.
Is there a bolt-on equivalent available for NQ or NQOD panelboards?
Yes, the bolt-on equivalent is catalog number QOB330. It shares the same 30A rating and trip curves but uses a bolt-on mounting configuration instead of a plug-in design.
Is the QO330 suitable for HVAC load applications?
Yes, this circuit breaker is HACR rated. It can be safely used for heating, air conditioning, and refrigeration equipment that require 30A, 3-phase branch circuit protection.
Does this breaker feature a visual trip indicator?
Yes, it is equipped with the standard Square D Visi-Trip indicator. A highly visible red flag will appear in the indicator window when the breaker trips due to an overcurrent or short circuit condition.
Does an overload on a single phase trip all three poles?
Yes. This is a common-trip circuit breaker. If a fault or overload occurs on any individual phase, the internal mechanism will automatically open all three poles simultaneously to disconnect power.
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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 285 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
285 reviews
- 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
- JCJerry C.Verified BuyerReviewingSquare D QO250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/8/26Great quality
No issues