Square D A1B120 Molded Case Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Quantity
Square D A1B120 - 20A 1 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for older distribution systems, the Square D A1B120 is a 20-amp, single-pole molded case circuit breaker. It is specifically built to mount into legacy NA1B panelboards, providing a reliable solution for maintaining vintage commercial and industrial infrastructure. The breaker delivers standard 10 kAIC interrupting capacity at 120VAC and includes Visi-Trip technology for immediate fault recognition.Specifications
| Brand | Square D |
|---|---|
| Part Number | A1B120-R |
| Series | A1B |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 48VDC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | A1B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D NA1B Panelboards |
| Wire Gauge | 14-8 AWG |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
Product FAQs
7 answersWhich panelboards are compatible with the Square D A1B120 circuit breaker?
The A1B120 is a legacy breaker specifically designed to mount into vintage Square D NA1B distribution panelboards.
Is the Square D A1B series currently in production?
No. The A1B series is an obsolete, legacy product line. It is maintained in distributor inventory to service existing Square D commercial and industrial distribution systems that require exact footprint replacements without undergoing a complete panel upgrade.
What wire gauge is supported by the A1B120 lugs?
The load side lugs on this 20-amp breaker are rated to accept solid or stranded electrical wire ranging from 14 AWG to 8 AWG.
How does this breaker connect to the panelboard bus?
The A1B120 features a bolt-on mounting configuration. This provides a secure, mechanically tight, and vibration-resistant connection directly to the NA1B panelboard bus.
What is the ambient operating temperature limit for the A1B120?
This thermal magnetic circuit breaker is calibrated for standard operation at a maximum ambient environment temperature of 40 degrees Celsius (104 degrees Fahrenheit).
Does this breaker provide a visual indication of a fault?
Yes. The device is constructed with Visi-Trip technology, providing a highly visible mechanical indicator on the face of the breaker to quickly identify a tripped circuit during troubleshooting.
What safety and testing standards does the A1B120 meet?
This molded case circuit breaker is tested and approved to meet UL 489 and CSA C22.2 No. 5 safety standards for electrical distribution equipment.
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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.