Square D QOU1401021 Miniature Circuit Breaker
- 40A
- 1 Pole
- Unit Mount
Quantity
Square D QOU1401021 - 40A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Part of the QO family, the QOU1401021 is a 1-pole, 40A miniature circuit breaker designed for commercial and industrial control applications. It operates on 120/240VAC and 48VDC systems. This unit mount breaker easily integrates into DIN rail setups, OEM panels, and custom enclosures. It features slotted box lugs that accept 14-2 AWG wire for secure connections. The standout feature is the integrated shunt trip, allowing for remote breaker tripping alongside standard thermal-magnetic protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU1401021 |
| Series | QOU |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Unit Mount |
| Voltage | 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOU |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | DIN Rail Systems, OEM Panels, Enclosures, Control Panels |
| Wire Gauge | 14-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Mounting Feet, Padlock Attachment, Terminal Shields |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Reverse Feed |
Product FAQs
6 answersWhat does the 1021 suffix indicate on the QOU1401021?
The 1021 suffix designates a factory-installed 120/240V AC shunt trip. This allows the circuit breaker to be opened remotely via a control signal.
How is the QOU1401021 installed in a control panel?
This unit-mount breaker features a cable-in, cable-out design with bolt-on connections. It can be surface-mounted, flush-mounted, or attached to standard DIN rail systems.
Does the QOU1401021 include a tripped status indicator?
Yes, it features the Square D Visi-Trip indicator. A highly visible red indicator appears when the breaker trips due to an overload or short circuit, allowing for rapid fault identification.
What wire gauges are accepted by the terminals on this breaker?
The box lugs are rated to accept 14 AWG to 2 AWG copper or aluminum conductors.
Can the QOU1401021 be utilized in DC circuits?
Yes, this breaker is rated for 48V DC applications and provides a 5 kA interrupting capacity for DC systems, in addition to its standard AC ratings.
What differentiates QOU breakers from standard QO breakers?
QOU breakers are unit-mount devices designed for OEM panels, enclosures, and DIN rail systems. Standard QO breakers are plug-on devices specifically designed to install onto the busbar of a Square D QO load center.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 106 reviews.
- HLHOMETIGO L.Verified BuyerReviewingSquare D QOU260 - 60A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/7/26Good thing
i recommend this for you
- RGRobert G.Verified BuyerReviewingSquare D QOU340 - 40A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/3/26Circuit breakers
I appreciate the fact that you had these in stock. my Square D distributor does not seem to stock these anymore and it takes a couple weeks to get. your pricing is inline with theirs.
- THTiffany H.Verified BuyerReviewingSquare D QOU115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/28/26Will use Super Breakers again
Arrived in a timely manner. Exactly what we needed for a job.
- CSCary S.Verified BuyerReviewingSquare D QOU250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/12/26Just what I ordered
Just what I needed for dock pedestal
- MHMark H.Verified BuyerReviewingSquare D QOU250VH - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/11/26Square D QOU250VH - 50A 2 Pole Miniature Circuit Breaker
Was just what I expected!