Square D QO120HM Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Square D
QO120HM
Miniature Circuit Breaker
Brand
Square D
SKU
QO120HM
Quantity
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Square D QO120HM - 20A 1 Pole Miniature Circuit Breaker
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Description
Accommodating loads with significant starting surges, this high-magnetic 20A single-pole unit prevents unwanted nuisance tripping. It incorporates the standard Visi-Trip red indicator flag, allowing facility managers to quickly spot tripped circuits in crowded electrical rooms. The plug-on configuration fits perfectly into Square D QO load centers and NQ panelboards. Rated for 10kAIC at 120VAC, this thermal-magnetic device is also HACR and SWD rated for HVAC and fluorescent switching duties.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO120HM |
| Series | QO |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Auxiliary Switch, Alarm Switch |
|---|---|
| Standards | CSA C22.2 No. 5, HACR, RoHS, SWD, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated, High-Magnetic |
Product FAQs
7 answersWhat panels are compatible with the QO120HM circuit breaker?
This breaker is designed for use in Square D QO load centers and NQ panelboards. It is not compatible with Homeline (HOM) or other manufacturer load centers.
What does the HM suffix indicate on the QO120HM breaker?
The HM suffix stands for High Magnetic. This means the breaker has a higher magnetic trip threshold, allowing it to handle higher initial inrush currents without nuisance tripping. It is often used for specific motor loads or equipment with high starting currents.
What wire sizes are accepted by the terminals on the QO120HM?
The pressure plate terminals accept 14 AWG to 8 AWG copper wire, or 12 AWG to 8 AWG aluminum wire. Ensure proper torque is applied during installation as specified on the breaker label.
Does the QO120HM provide ground fault or arc fault protection?
No, this is a standard thermal-magnetic circuit breaker. It provides overload and short-circuit protection but does not include GFCI or AFCI features.
How many panel spaces does the QO120HM require?
As a 1-pole miniature circuit breaker, it requires a single 3/4-inch space in a compatible QO load center or NQ panelboard.
Can the QO120HM be installed in a Square D Homeline panel?
No. QO breakers have a 3/4-inch width per pole and a specific plug-on clip design. Homeline panels require 1-inch wide HOM breakers.
Does the QO120HM feature a Visi-Trip indicator?
Yes, it includes the Square D Visi-Trip feature. When the breaker trips due to an overcurrent or short circuit, the handle snaps to a midpoint position and a highly visible red indicator appears to help you quickly identify the tripped 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