Square D QOB320VH1021 Miniature Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Square D
QOB320VH1021
Miniature Circuit Breaker
Brand
Square D
SKU
QOB320VH1021
Quantity
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Square D QOB320VH1021 - 20A 3 Pole Miniature Circuit Breaker
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Description
Built for advanced control in commercial settings, the QOB320VH1021 combines reliable overcurrent protection with remote shutdown capabilities. This 3-pole, 20A breaker is essential for automated electrical systems. It mounts into Square D NQ and NQOD panelboards using a secure bolt-on connection. With a high-interrupting rating of 22 kAIC at 240V, it safely clears severe faults. The integrated 120/240V AC shunt trip enables remote tripping, while the Visi-Trip window confirms tripped status.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 120VAC, 22kA @ 240VAC, 22kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| 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 | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, High Interrupting Capacity |
Product FAQs
7 answersWhat panelboards are compatible with the QOB320VH1021?
This bolt-on circuit breaker is designed specifically for Square D NQ and NQOD panelboards. It cannot be installed in standard QO residential load centers, which require plug-on style breakers.
What does the 1021 suffix mean in the QOB320VH1021 catalog number?
The 1021 suffix indicates that the breaker is equipped with a factory-installed 120/240VAC shunt trip accessory. This allows the breaker to be tripped remotely via an external control signal.
What does the VH designate in this breaker part number?
The VH indicates a high interrupting rating. While standard QOB breakers are typically rated at 10kAIC, this VH version provides a 22kAIC interrupting capacity at 120/240VAC.
Can the QOB320VH1021 be used on a 480V system?
No. This breaker is rated for a maximum of 120/240VAC. It is not suitable for 277/480V or 480V systems, which would require a different breaker frame such as the Square D EDB series.
How is the shunt trip actuated on this breaker?
The internal shunt trip mechanism requires a separate 120V to 240V AC control voltage. When this voltage is applied to the accessory leads, it automatically opens the breaker contacts to disconnect power.
What applications typically require a shunt trip breaker like this?
Shunt trip breakers are commonly used for emergency power-off (EPO) systems, commercial kitchen hood suppression systems, and elevator control circuits where power must be automatically disconnected during a fire or safety event.
How are conductors secured to the QOB320VH1021?
The breaker utilizes pressure plate terminals that accept 14 AWG to 8 AWG copper or aluminum wire. Always verify the required torque values printed on the breaker face or manufacturer documentation before terminating.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 205 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 3/11/26
Customers say these electrical breakers arrive exactly as ordered and work perfectly for their intended applications. They consistently praise the competitive pricing, which many report is significantly lower than local suppliers. Fast shipping and prompt delivery are frequently highlighted, with many receiving orders within days or even next-day delivery for urgent needs. The breakers arrive well-packaged and in excellent condition. Many reviews emphasize the company's extensive inventory availability, particularly for hard-to-find breakers. One customer experienced difficulty with order cancellation and was charged a restocking fee, which caused dissatisfaction.
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Rating
205 reviews
- 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.
- RKRyan K.Verified BuyerReviewingSquare D QOB230VH - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26Awesome
Worked great