Square D QOB370VH-1021 QOB370VH1021 - 70A 3 Pole Miniature Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Quantity
Square D QOB370VH1021 - 70A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Part of the QO series, this 70A miniature circuit breaker comes equipped with a factory-installed 120/208/240VAC shunt trip for remote tripping capabilities. It is engineered for commercial and industrial applications requiring emergency shutdown or automated control integration. The three-pole device bolts securely into Square D NQ and NQOD panelboards. Rated at 22 kAIC at 120/240VAC, it features thermal-magnetic protection and a Visi-Trip indicator for easy troubleshooting.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB370VH-1021 |
| Series | QOB |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 120VAC, 22kA @ 240VAC, 22kA @ 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 | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, RoHS, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
5 answersWhat does the 1021 suffix indicate on the QOB370VH-1021 breaker?
The 1021 suffix means this breaker comes with a factory-installed shunt trip accessory. This allows the breaker to be tripped remotely using a 120V, 208V, or 240V AC control signal.
Can I install the QOB370VH-1021 in a standard QO load center?
No. The QOB series features a bolt-on mounting design intended specifically for Square D NQ and NQOD panelboards. Standard QO load centers require plug-on breakers.
What does the VH designation mean in the QOB370VH-1021 part number?
The VH indicates a high interrupting rating. While standard QOB breakers typically offer 10kAIC, this VH version provides a 22kAIC interrupting rating at 120/240V AC.
How do I know if the QOB370VH-1021 has tripped?
This breaker features the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or a remote shunt trip signal, a highly visible red indicator appears in the window to help quickly identify the tripped circuit.
Does the shunt trip on this breaker require a separate power source?
Yes. The factory-installed shunt trip requires an external 120V, 208V, or 240V AC control voltage to operate the remote tripping mechanism.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 211 reviews.
- MLMike L.Verified BuyerReviewingSquare D QOB250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/9/26breaker orders
Breaker worked out great
Can not be happier with the quick shipping
- RCRichard C.Verified BuyerReviewingSquare D QOB380 - 80A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/7/26Great price quick turn around
Thank you for getting me the breaker in a timely fashion
- DSDarren S.Verified BuyerReviewingSquare D QOB250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/5/26Airport taxi lighting
After contactor replacement we discovered bad breakers and were able to get replacements from Super Breakers in 2 days. THANK YOU SUPER BREAKERS..
- MRMiguel R.Verified BuyerReviewingSquare D QOB220GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/1/26Excellent
Excellent product and service
- MRMiguel R.Verified BuyerReviewingSquare D QOB230GFI - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/1/26Excellent
Excellent product and service