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Square D QO1201042 Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Square D
QO1201042
Miniature Circuit Breaker
Brand
Square D
SKU
QO1201042
Quantity
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Square D QO1201042 - 20A 1 Pole Miniature Circuit Breaker
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Description
Built for commercial and industrial applications, the Square D QO1201042 is a 20A, single-pole miniature circuit breaker. It provides standard thermal-magnetic protection for 120/240VAC systems. This plug-on breaker installs into Square D QO load centers and NQ panelboards. It accepts 14-8 AWG copper or aluminum wiring. A factory-installed 12-24V AC/DC shunt trip allows for remote tripping of the circuit. It also includes the signature Visi-Trip indicator for quick fault identification.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO1201042 |
| Series | QO |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC |
| Terminal Type | Pressure Plate |
|---|---|
| For Use With | QO Load Centers, NQ 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 (12-24V AC/DC) |
| Standards | CSA C22.2 No. 5, UL 489, HACR Rated |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat does the 1042 suffix mean on the QO1201042 circuit breaker?
The 1042 suffix indicates the breaker is equipped with a factory-installed shunt trip. This allows the circuit to be opened remotely when a 12V to 24V AC or DC control voltage signal is applied.
Which panelboards and load centers accept the QO1201042 breaker?
This plug-on miniature circuit breaker is compatible with Square D QO load centers and NQ panelboards.
What wire gauge and material can be used with the QO1201042?
The pressure plate terminals are rated for 14 AWG to 8 AWG wire and accept both copper and aluminum conductors.
How can I easily identify if the QO1201042 has tripped?
This breaker features the Square D Visi-Trip indicator, which displays a highly visible red flag when the breaker has tripped due to an overcurrent or shunt trip activation.
How is the QO1201042 installed into the panel?
It features a standard plug-on mounting style, allowing it to snap directly onto the busbar of compatible QO load centers and NQ panelboards without bolting.
What trip functions are included in the QO1201042 thermal-magnetic mechanism?
The fixed thermal-magnetic trip unit provides long-time protection against sustained overloads and instantaneous protection against short circuits.
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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