Square D QOB220-2100 QOB2202100 - 20A 2 Pole Miniature Circuit Breaker
- 20A
- 2 Pole
- Bolt-On
Square D
QOB220-2100
QOB2202100 - 20A 2 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QOB220-2100
Quantity
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Square D QOB2202100 - 20A 2 Pole Miniature Circuit Breaker
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Description
Built for commercial and industrial use, the Square D QOB220-2100 delivers reliable 2-pole, 20A circuit protection with a built-in alarm switch. This factory-installed feature provides remote indication specifically when the breaker trips, enhancing system monitoring. It installs into NQ and NQOD panelboards via a sturdy bolt-on connection. Delivering 10 kAIC interrupting capacity at 120/240VAC, it also includes the signature Visi-Trip indicator for immediate visual status.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB220-2100 |
| Series | QOB |
| Amperage | 20A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 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 | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Alarm Switch (Factory Installed), 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 |
Product FAQs
6 answersCan I install the QOB220-2100 in a standard Square D QO load center?
No. The QOB220-2100 is a bolt-on circuit breaker designed specifically for Square D NQ and NQOD panelboards. Standard QO residential load centers require plug-on breakers (QO series) and will not accept bolt-on (QOB series) models.
What does the -2100 suffix mean on the QOB220-2100 catalog number?
The -2100 suffix indicates that this breaker includes a factory-installed alarm switch (bell alarm). This accessory provides a remote signal when the breaker trips due to an overload or short circuit, making it ideal for monitoring critical commercial or industrial circuits.
How is the QOB220-2100 secured to the panelboard?
This QOB frame breaker features a bolt-on connection. It fastens directly to the panelboard busbar using integrated mounting screws, ensuring a secure, vibration-resistant electrical connection typically required in commercial and industrial environments.
Does the QOB220-2100 feature a visual trip indicator?
Yes, it includes Square D's signature Visi-Trip indicator. When the breaker trips, the handle snaps to a center position and a highly visible red flag appears in the window, allowing you to quickly identify the faulted circuit in a crowded panel.
Is the QOB220-2100 suitable for HVAC equipment?
Yes, this breaker is HACR rated. It is approved for use with heating, air conditioning, and refrigeration equipment that requires group motor protection.
How does the thermal-magnetic trip mechanism operate on this breaker?
The QOB220-2100 uses a fixed thermal-magnetic trip unit with long-time and instantaneous (LI) functions. The thermal element provides delayed tripping for sustained overloads, while the magnetic element trips instantaneously in the event of a short circuit.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 206 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
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.