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Wadsworth A20NI Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Wadsworth
A20NI
Miniature Circuit Breaker
Brand
Wadsworth
SKU
A20NI
Quantity
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Wadsworth A20NI - 20A 1 Pole Miniature Circuit Breaker
Re-Certified
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Wadsworth A20NI - 20A 1 Pole Miniature Circuit Breaker
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| Brand | Wadsworth |
|---|---|
| Part Number | A20NI |
| Series | A |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | A-NI |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Wadsworth Type A Load Centers |
| Wire Gauge | 14-6 AWG |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Class CTL |
Sold out
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Wadsworth A20NI - 20A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Wadsworth |
|---|---|
| Part Number | A20NI-R |
| Series | A |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | A-NI |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Wadsworth Type A Load Centers |
| Wire Gauge | 14-6 AWG |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Class CTL |
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Description
Built for residential applications, the Wadsworth A20NI delivers 20 amps of thermal-magnetic protection for standard 120V branch circuits. This single-pole component installs into classic Wadsworth Type A load centers without requiring any adapter hardware. Rated for 10kAIC, it features a non-interchangeable (NI) design and carries both HACR and SWD ratings for switching duty. For modern alternatives, this exact OEM footprint is cross-referenced and replaced by the Connecticut Electric UBIA20NI.Specifications
| Brand | Wadsworth |
|---|---|
| Part Number | A20NI-R |
| Series | A |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | A-NI |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Wadsworth Type A Load Centers |
| Wire Gauge | 14-6 AWG |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Class CTL |
Product FAQs
6 answersWhich load centers accept the Wadsworth A20NI circuit breaker?
This breaker is engineered specifically for classic Wadsworth Type A load centers. Its proprietary plug-on footprint is not compatible with panels from other manufacturers.
Is there a modern aftermarket replacement for the Wadsworth A20NI?
Yes. Since Wadsworth is an obsolete legacy brand, Connecticut Electric manufactures an ETL-listed direct replacement, commonly found under the catalog number UBIA20NI.
What does the NI designation mean on the A20NI breaker?
The NI stands for non-interchangeable. This frame construction includes a rejection mechanism designed to ensure proper fitment and prevent the installation of incorrect breaker types in specific panel slots.
What applications are suitable for this 20A single-pole breaker?
A 20A, 120VAC single-pole breaker is standard for 120-volt branch circuits. Common applications include dedicated appliance circuits, kitchen receptacles, and general lighting in residential or light commercial settings.
How does the LI trip function protect the circuit?
The thermal-magnetic (LI) trip unit provides dual protection. The thermal element (Long-Time) heats up and trips the breaker during sustained overloads, while the magnetic element (Instantaneous) trips immediately in the event of a short circuit.
Does the A20NI require any mounting hardware or adapter kits?
No. The A20NI features a standard plug-in connection designed to snap directly into the busbar of a Wadsworth Type A panel without the need for additional adapter hardware.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 5 reviews.
Total 5 star reviews: 5 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
5 reviews
- PSPaul S.Verified BuyerReviewingWadsworth A15NI - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/14/26Worked fine, glad to have it.
I had no idea how much it could cost.
- DPDavid P.Verified BuyerReviewingSquare D 9065ARO1R Overload RelayI recommend this productRated 5 out of 5 stars11/3/25Loved it!
Fantastic!!!
- KJKevin J.ReviewingWadsworth A260NI - 60A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars1/11/24Great deal
Came on time in great shape
- VJVernice J.ReviewingWadsworth A240NI - 40A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/16/20Order of Breaker
This company did an excellent job with providing a good part and delivery exceeded my expectations.
- HOHugh O.ReviewingGeneral Electric AF43S Panel Board CoverI recommend this productRated 5 out of 5 stars9/24/17Breaker panel
I recently purchased a breaker panel cover. It arrived in a timely manner well packed and unharmed.
The shipping was free so I was sceptical.
All is well.