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Square D QO330-1021 Miniature Circuit Breaker
- 30A
- 3 Pole
- Plug-On
Square D
QO330-1021
Miniature Circuit Breaker
Brand
Square D
SKU
QO330-1021
Quantity
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Square D QO330-1021 - 30A 3 Pole Miniature Circuit Breaker
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Description
Engineered for commercial and industrial applications, the Square D QO330-1021 is a 30A, three-pole miniature circuit breaker equipped with a factory-installed 120/240V shunt trip. It installs into standard Square D QO load centers, as well as NQ and NQOD panelboards. The plug-on mounting design ensures a secure, efficient connection. Rated for 10kAIC at 240V, this thermal-magnetic breaker features the exclusive Visi-Trip indicator to easily identify tripped circuits and is HACR rated.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO330-1021 |
| 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 |
| 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 |
| Standards | CSA C22.2 No. 5, UL 489, RoHS, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip |
Product FAQs
6 answersWhat does the -1021 suffix indicate on the QO330-1021?
The -1021 catalog number suffix denotes a factory-installed 120/240VAC shunt trip. This allows the breaker to be tripped remotely by applying voltage to the shunt trip coil, which is commonly used for emergency stops or automated control systems.
What type of panels will accept the QO330-1021 breaker?
This plug-on breaker is compatible with Square D QO load centers, as well as commercial NQ and legacy NQOD panelboards. It requires three full spaces on the busbar for installation.
What are the wiring requirements for the terminals on this breaker?
The pressure plate terminals are rated for both aluminum and copper conductors, accepting wire sizes from 14 AWG up to 8 AWG. Ensure proper torque specifications are followed during installation as labeled on the breaker.
Is the QO330-1021 suitable for direct current (DC) circuits?
Yes, in addition to its standard AC ratings, this thermal-magnetic breaker is rated for 48VDC applications with a 5kA interrupting capacity. This makes it suitable for specific low-voltage control or battery circuits.
How can I tell if the QO330-1021 has tripped?
This breaker includes the Square D Visi-Trip indicator. When the breaker trips due to an overload or short circuit, the handle moves to a center position and a highly visible red indicator appears, making it easy to identify the tripped circuit in a crowded panel.
Is this breaker suitable for HVAC equipment?
Yes, the QO330-1021 is HACR rated. This means it is approved for use with heating, air conditioning, and refrigeration equipment that requires a 30A, 3-pole circuit.
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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