Square D QOB370VH1021 Miniature Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Quantity
Square D QOB370VH1021 - 70A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Built for emergency shutdown and remote control applications, this 70A miniature circuit breaker includes a factory-installed 120/208/240VAC shunt trip mechanism. The three-pole configuration provides reliable thermal-magnetic overcurrent protection for commercial electrical systems. Designed to mount into Square D NQ and NQOD panelboards, the bolt-on connection ensures a stable fit.Specifications
| Brand | Square D |
|---|---|
| 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 |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Cu/Al) |
| 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) |
| Standards | UL 489, CSA C22.2 No. 5, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, RoHS Compliant, Mercury Free |
Product FAQs
7 answersWhich Square D panelboards accept the QOB370VH1021 circuit breaker?
This bolt-on breaker is compatible with Square D NQ and NQOD series panelboards. It will not fit in standard QO load centers, which require plug-on breakers.
What does the 1021 suffix indicate on the QOB370VH1021?
The 1021 suffix means this breaker includes a factory-installed 120/208/240VAC shunt trip. This allows the breaker to be tripped remotely by applying voltage to the shunt trip coil.
What does the VH designation mean in the QOB370VH1021 catalog number?
The VH indicates that this breaker has a higher interrupting rating than standard models. It is rated for 22kAIC at 120/240VAC, making it suitable for systems with higher available fault currents.
What wire gauge is required for the QOB370VH1021 terminals?
The box lugs on this 70A breaker accept 8 AWG to 2 AWG wire. Both copper and aluminum conductors are supported.
How is the QOB370VH1021 installed in a panelboard?
This is a QOB frame breaker, which uses a bolt-on connection. It fastens directly to the panelboard bus with screws, providing a secure connection often required in commercial and industrial applications.
Can the trip settings on the QOB370VH1021 be adjusted?
No, this breaker features a fixed thermal-magnetic trip unit. The long-time and instantaneous trip functions are factory-calibrated for 70 amps and cannot be modified in the field.
Does the QOB370VH1021 provide ground fault or arc fault protection?
No, this is a standard thermal-magnetic breaker designed for overload and short-circuit protection. It does not include GFCI or AFCI circuitry.
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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