Square D QOB150VH-1021 Miniature Circuit Breaker
- 50A
- 1 Pole
- Bolt-On
Quantity
Square D QOB150VH-1021 - 50A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Delivering an upgraded 22kAIC interrupting capacity, this 50-amp single-pole breaker includes a factory-installed 120/208/240VAC shunt trip for remote disconnection. It mounts into Square D NQ and NQOD panelboards, requiring two pole spaces due to the attached accessory module. The bolt-on connection provides superior mechanical stability for commercial and industrial facilities, while the integrated Visi-Trip window allows rapid identification of tripped status during maintenance.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB150VH-1021 |
| Series | QOB |
| Amperage | 50A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Cu/Al) |
| Max Wire | 2 AWG |
| Min Wire | 8 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 | Load Side Lugs Included, Mounting Hardware, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Visual Trip Indicator |
Product FAQs
8 answersWhat does the "-1021" suffix mean on the QOB150VH-1021?
The "-1021" suffix indicates that this breaker includes a factory-installed 120/208/240 VAC shunt trip accessory. This allows the breaker to be tripped remotely via an external voltage signal.
How many panel spaces does the QOB150VH-1021 require?
Although it is a 1-pole breaker, the factory-installed shunt trip accessory requires an additional pole space. Therefore, it will occupy two spaces in your NQ or NQOD panelboard.
What panelboards are compatible with the QOB150VH-1021?
This bolt-on miniature circuit breaker is designed exclusively for use in Square D NQ and NQOD series panelboards. It will not fit in standard QO load centers or Homeline panels.
What does the "VH" stand for in the QOB150VH-1021 catalog number?
The "VH" designates this as a high-interrupting breaker with a 22kAIC rating at 120/240VAC. This provides a higher fault current withstand capability than standard 10kAIC QOB breakers.
Can I field-install a shunt trip on a standard QOB150VH breaker instead of buying the QOB150VH-1021?
No. Square D shunt trips for QO and QOB miniature circuit breakers must be factory-installed. If your application requires a shunt trip, you must purchase a breaker with the appropriate suffix, such as the QOB150VH-1021.
What wire sizes are accepted by the terminals on the QOB150VH-1021?
The primary box lugs on this 50A breaker accept 8 AWG to 2 AWG copper or aluminum wiring. The shunt trip accessory terminals accept two 14-12 AWG copper wires.
Can the hot and neutral control wires be connected to either terminal on the shunt trip?
Yes, for the 1021 suffix shunt trip accessory, the hot and neutral control wires can be connected to either of the two shunt trip terminals without affecting operation.
Does the shunt trip on the QOB150VH-1021 require a separate power source?
Yes, the shunt trip mechanism requires an external 120V, 208V, or 240V AC control voltage signal to actuate the trip coil and open the breaker contacts remotely.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 206 reviews.
- KHKristopher H.Verified BuyerReviewingSquare D QOB120GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/28/26Great Price!
Great price. Fast delivery. My local electric distributor wanted double for the same breaker, so it was a no brainer to order this one. Ordered another one since with the same great service.
- BLBOOSTIX L.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/17/26QOB220
That's nice breakers!
- PHPaul H.Verified BuyerReviewingSquare D QOB330 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Quick shipping and delivery
Shipped and delivered on time for installation at one of our projects. Thank you!
- RMRick M.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Project Mgr
Just what I needed.
- DHDoug H.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Square D QOB breakers
As always, our order arrived timely, and accurate. You can’t beat their prices that’s why we have used this company for years.