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Square D Q1B370 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Square D
Q1B370
Molded Case Circuit Breaker
Brand
Square D
SKU
Q1B370
Quantity
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Square D Q1B370 - 70A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial use, the Square D Q1B370 is a 3-pole, 70A molded case circuit breaker. It features a thermal-magnetic trip unit to protect electrical systems against overloads and short circuits. This bolt-on breaker fits legacy Square D NQO and NQOB panelboards. For modern upgrades, it is replaced by the QOB370, which requires an SK5668 mounting kit for proper installation. Rated 10kAIC at 240VAC, it includes a Visi-Trip indicator for quick fault identification.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q1B370-R |
| Series | Q1B |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | Q1B |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Square D NQO, NQOB Panelboards |
| Wire Gauge | #8-2 AWG |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Common Trip |
Product FAQs
5 answersWhich panelboards are compatible with the Q1B370 circuit breaker?
This breaker is designed specifically for installation in legacy Square D NQO and NQOB panelboards.
What is the modern replacement for the legacy Q1B370?
The modern equivalent is the Square D QOB370. However, upgrading from a Q1B to a QOB breaker requires an SK5668 mounting bracket for proper fitment. Sourcing an exact Q1B370 replacement allows for direct installation without retrofit kits.
What wire gauge is supported by the terminals on this breaker?
The integrated box lugs accept wire sizes ranging from 8 AWG to 2 AWG.
What type of protection does the LI trip function provide?
The LI code indicates a thermal-magnetic trip unit featuring Long-Time overload protection and Instantaneous short circuit protection. Both the thermal and magnetic trip points are fixed on this model.
How is the Q1B370 secured to the panelboard?
This is a bolt-on circuit breaker that fastens directly to the panelboard bus with screws, providing a secure mechanical and electrical connection compared to plug-on alternatives.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
1 review
- MCMichael C.ReviewingSquare D Q1B3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/11/22Fast Service.
Fast Service.