Square D QOB140HID Miniature Circuit Breaker
- 40A
- 1 Pole
- Bolt-On
Square D
QOB140HID
Miniature Circuit Breaker
Brand
Square D
SKU
QOB140HID
Quantity
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Square D QOB140HID - 40A 1 Pole Miniature Circuit Breaker
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Description
Built for commercial lighting systems, the Square D QOB140HID is a 40A, 1-pole miniature circuit breaker. It is specifically designed to handle the high inrush currents associated with High Intensity Discharge (HID) loads. This unit mounts into Square D NQ and NQOD panelboards using a secure bolt-on connection. The bolt-on design ensures a stable, vibration-resistant installation. Rated for 10 kAIC at 120/240V, it includes thermal-magnetic protection and the signature Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| 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 | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HID, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HID Rated, HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat panelboards are compatible with the QOB140HID?
This bolt-on circuit breaker is designed for use in Square D NQ and NQOD panelboards. It is not compatible with standard QO residential load centers, which require plug-on breakers.
What does the HID suffix mean on this Square D breaker?
The HID designation indicates the breaker is specifically rated for switching High Intensity Discharge lighting loads. It handles the high inrush currents typical of these lighting systems while providing standard thermal magnetic protection.
What is the difference between the QO140HID and QOB140HID?
The QO140HID is a plug-on breaker designed for QO load centers. The QOB140HID is the bolt-on version built for commercial NQ and NQOD panelboards. Both share the same 40A capacity and HID lighting rating.
How does the bolt-on mounting work for this breaker?
The QOB140HID secures directly to the busbar in compatible panelboards using a screw. This bolt-on design provides a highly reliable, vibration resistant connection commonly required in commercial and industrial environments.
What does the LI trip function indicate on this breaker?
The LI designation stands for Long-Time and Instantaneous trip functions. The long-time function protects against sustained overloads, while the instantaneous function trips immediately during a short circuit.
What type of wire connections does the QOB140HID support?
This breaker is equipped with box lugs that accept either aluminum or copper wiring. The terminals accommodate wire sizes ranging from 8 AWG to 2 AWG.
Can this breaker be used in DC applications?
Yes, the QOB140HID is rated for 48VDC applications in addition to its standard 120/240VAC rating.
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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