Square D QOB2100H Miniature Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Square D
QOB2100H
Miniature Circuit Breaker
Brand
Square D
SKU
QOB2100H
Quantity
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Square D QOB2100H - 100A 2 Pole Miniature Circuit Breaker
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Description
Engineered for commercial use, the Square D QOB2100H provides reliable thermal-magnetic protection. This 2-pole, 100A breaker operates at 240VAC to defend against overloads. It installs into Square D NQ and NQOD panelboards with a stable, vibration-proof bolt-on connection. Note that this model is replaced by the standard QOB2100. Rated for 10 kAIC at 240V, it includes the signature Visi-Trip indicator for rapid identification of tripped circuits and is HACR rated.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 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 (Al/Cu) |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip |
Product FAQs
8 answersWhich panelboards are compatible with the QOB2100H circuit breaker?
This bolt-on breaker is designed exclusively for use in Square D NQ and NQOD series panelboards. It cannot be installed in standard Homeline or QO load centers, which require plug-on connections.
How many panel spaces does the QOB2100H require?
This 2-pole breaker has a standard QO-profile width of 1.5 inches, meaning it requires two adjacent panel spaces (0.75 inches per pole) in a compatible NQ or NQOD panelboard.
What type of wire connections does the QOB2100H use?
This breaker is equipped with standard box lugs that accept 4 AWG to 2/0 AWG conductors. The lugs are dual-rated for both copper and aluminum wiring, providing flexibility for various commercial feeder applications.
Does the QOB2100H feature a tripped-state indicator?
Yes, it includes the signature Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, the handle snaps to a center position and a highly visible red indicator appears, making it easy to identify the tripped breaker in a crowded panel.
Is this breaker suitable for HVAC equipment?
Yes, the QOB2100H is HACR rated. This means it is tested and approved for use with heating, air conditioning, and refrigeration equipment that requires motor group combination protection.
Can I substitute a standard QO2100 for the QOB2100H?
No. While they share identical amperage and voltage ratings, the QO2100 is a plug-on breaker. The QOB2100H features a bolt-on connection, which is required for secure, vibration-resistant installation in commercial NQ and NQOD panelboards.
Is the QOB2100H rated for direct current (DC) applications?
Yes, in addition to its standard AC ratings, this breaker is UL listed for use in DC circuits up to 48VDC. It provides a 5kA interrupting capacity for these low-voltage DC applications, making it suitable for specific control or battery circuits.
How does the thermal-magnetic trip mechanism function on this breaker?
The QOB2100H uses a fixed thermal element to provide long-time delay protection against sustained overloads, combined with a magnetic element that triggers an instantaneous trip in the event of a severe short circuit.
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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