Square D QOU2100-1021 QOU21001021 - 100A 2 Pole Miniature Circuit Breaker
- 100A
- 2 Pole
- Unit Mount
Quantity
Square D QOU21001021 - 100A 2 Pole Miniature Circuit Breaker
New
Quantity
Description
Built for commercial and industrial applications, the Square D QOU2100-1021 is a 2-pole, 100A miniature circuit breaker. It features a unit-mount design providing flexible installation options for DIN rail systems, OEM panels, and enclosures. This thermal-magnetic breaker accepts 12-2/0 AWG wire and operates in both AC and DC systems. The standout feature is the factory-installed 120/240V shunt trip, enabling remote tripping for enhanced control, alongside the signature Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOU2100-1021 |
| Series | QOU |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 120/240VAC, 60VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC, 5kA @ 60VDC |
| Frame Type | QOU |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | DIN Rail Systems, OEM Panels, Enclosures |
| Wire Gauge | 12-2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 12 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Mounting Feet, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CE, CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Reverse Feed |
Product FAQs
9 answersWhat does the -1021 suffix mean on the QOU2100-1021?
The -1021 suffix indicates the breaker comes with a factory-installed 120/208/240V AC shunt trip. This allows the breaker to be tripped remotely by applying voltage to the shunt trip coil.
How many pole spaces does the QOU2100-1021 require?
Although it is a 2-pole breaker, the factory-installed shunt trip adds an additional pole space. It requires a total of three pole spaces for installation in your panel or enclosure.
What wire sizes are compatible with the shunt trip terminals?
The shunt trip accessory terminals accept up to two 14 to 12 AWG copper (Cu) wires. The hot and neutral wires can be connected to either terminal on the shunt trip.
Can I field-install a shunt trip on a standard QOU breaker instead?
No, shunt trips for Square D QOU miniature circuit breakers cannot be added in the field. They must be factory-installed, which is why the specific -1021 suffix is required.
Is this breaker compatible with standard QO load centers?
No, QOU breakers are unit-mount breakers designed for DIN rail systems, OEM panels, and enclosures. They are not plug-on or bolt-on breakers for standard QO or NQ/NQOB panelboards.
Can the QOU2100-1021 be mounted directly to a DIN rail?
Yes, QOU miniature circuit breakers come equipped with slots in the molded case designed for direct mounting to a standard 35mm DIN rail.
Can this breaker be used on 240V delta systems?
No. Two-pole QOU circuit breakers rated for 120/240V AC are UL Listed for use on 120/240V single-phase, three-wire or 208Y/120V three-phase, four-wire electrical systems. They cannot be used on 240V delta systems.
What is the purpose of the Visi-Trip indicator on this breaker?
The Visi-Trip indicator provides a clear visual flag when the circuit breaker has tripped due to an overcurrent condition, short circuit, or a remote shunt trip command.
Is QOU21001021 the same as QOU2100-1021?
Yes, QOU21001021 is simply the unhyphenated catalog number for the QOU2100-1021. Both refer to the exact same 100A, 2-pole unit-mount breaker with a factory-installed shunt trip.
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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!