Square D QOB2100VH1021 Miniature Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Quantity
Square D QOB2100VH1021 - 100A 2 Pole Miniature Circuit Breaker
New
Quantity
Description
Engineered for commercial electrical distribution, this 100A two-pole component features a factory-installed 120/208/240VAC shunt trip mechanism. It installs securely into Square D NQ and legacy NQOD panelboards using a standard bolt-on connection. Delivering a high interrupting capacity of 22kA at 120/240V, the unit includes the signature Visi-Trip indicator for rapid fault identification and is HACR rated for HVAC applications.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 22kA @ 240VAC, 22kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 4 AWG - 2/0 AWG (Cu/Al) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Handle Lock |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip, High Interrupting Capacity |
Product FAQs
8 answersWhat panelboards are compatible with the QOB2100VH1021 circuit breaker?
This bolt-on breaker is designed specifically for use in Square D NQ and NQOD panelboards. It cannot be installed in standard QO load centers, which require plug-on breakers.
What does the 1021 suffix indicate on this Square D breaker?
The 1021 suffix means this circuit breaker comes with a factory-installed 120/240VAC shunt trip accessory. This allows the breaker to be tripped remotely by applying voltage to the shunt trip coil, which is often required for emergency shutdown systems.
What does the VH stand for in the QOB2100VH1021 catalog number?
The VH designation indicates a higher interrupting capacity. While standard QOB breakers are typically rated at 10kAIC, this VH model provides a 22kAIC interrupting rating at 120/240VAC.
Can the QOB2100VH1021 be used in DC applications?
Yes, this breaker is rated for use in DC applications with an interrupting rating of 5kAIC at 48VDC.
What is the difference between QO and QOB circuit breakers?
QO circuit breakers use a plug-on mounting mechanism typical in residential load centers. QOB circuit breakers, like the QOB2100VH1021, feature a bolt-on connection designed for commercial and industrial NQ and NQOD panelboards.
How do I know if the QOB2100VH1021 has tripped?
This breaker features the Square D Visi-Trip indicator. When the breaker trips due to an overload, short circuit, or a remote shunt trip command, a highly visible red indicator appears in the window to help you quickly identify the tripped breaker in the panel.
What wire sizes and materials are supported by the terminals on this breaker?
The box lug terminals on the QOB2100VH1021 are designed to accept 4 AWG to 2/0 AWG wire. They are compatible with both copper and aluminum conductors.
What type of trip mechanism does the QOB2100VH1021 use?
It utilizes a thermal magnetic trip mechanism with fixed long-time and instantaneous trip functions. The thermal element protects against sustained overloads, while the magnetic element responds immediately to short circuits.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 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