Square D A1B370 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Quantity
Square D A1B370 - 70A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the A1B series, the Square D A1B370 is a 3-pole, 70A molded case circuit breaker for commercial distribution. It provides essential long-time and instantaneous (LI) trip functions. This unit features a bolt-on configuration and installs into legacy Square D NA1B panelboards. It accommodates 8-2 AWG wire via standard lugs, making it an exact fit for maintaining older infrastructure. Rated at 10kAIC (240VAC), it includes a Visi-Trip indicator for quick status checks.Specifications
| Brand | Square D |
|---|---|
| Part Number | A1B370-R |
| Series | A1B |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D NA1B 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 Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Long Body |
Product FAQs
6 answersWhich panelboards accept the Square D A1B370 circuit breaker?
This bolt-on breaker is specifically engineered for installation in legacy Square D NA1B panelboards.
What wire gauge range is supported by the terminals on this breaker?
The standard lug terminals accommodate 8 AWG to 2 AWG copper or aluminum wire.
What type of overcurrent protection does this breaker provide?
It utilizes a fixed thermal magnetic trip unit that delivers long time and instantaneous (LI) protection against overloads and short circuits.
How can an electrician easily identify if the A1B370 has tripped?
This breaker features a Visi-Trip indicator that provides a clear visual confirmation when the circuit has tripped, allowing for faster troubleshooting during maintenance.
Can this breaker be used in modern Square D panelboards?
No. The A1B370 is a legacy component designed exclusively as an exact fit replacement for older NA1B distribution systems. It is not compatible with current Square D panelboard designs.
What is the primary application for the A1B370 breaker?
It is utilized by panel builders and electricians to maintain and service vintage commercial and industrial electrical infrastructure that relies on the A1B series form factor.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
- NLNoble L.ReviewingSquare D A1B115 - 15A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/19/21Great Service, On Time Delivery, Great Price
SuperBreakers is my a dependable source to meet my customer's requirements at a good value and with on time delivery. When you throw in great customer service, you can't beat that combination.
- CHCobe H.ReviewingSquare D A1B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/11/19Repeat customer
Although these breakers are refurbished they work great. It beats having to change the whole panel because of one breaker.