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Siemens BA120AF AFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Siemens
BA120AF
AFCI Miniature Circuit Breaker
Brand
Siemens
SKU
BA120AF
Quantity
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Siemens BA120AF - 20A AFCI Miniature Circuit Breaker
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Description
Designed for legacy code applications, this 20A branch/feeder AFCI detects parallel arcing faults to mitigate electrical fire risks. The bolt-on mechanism ensures a stable connection within Siemens P1, P2, and P3 commercial panelboards. While newer combination types like the BA120AFC have superseded this model for modern residential codes, it remains a critical exact-match replacement for existing commercial installations requiring a 10kAIC rating and standard pigtail neutral wiring.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BA120AF |
| Series | BA |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Special Classification | AFCI |
|---|---|
| Available Options | Padlock Attachment |
| Accessories | Load Side Lugs Included, Pigtail Neutral |
| Standards | CSA C22.2 No. 5, HACR, SWD, UL 1699, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Branch-Feeder Arc Fault Protection, HACR Rated, SWD Rated |
Product FAQs
6 answersCan I install the BA120AF in a standard residential load center?
No. The BA120AF is a B-frame bolt-on breaker designed for Siemens P1, P2, and P3 commercial panelboards. It will not fit in standard residential load centers that require plug-on connections.
What type of arc fault protection does the BA120AF provide?
The BA120AF is a branch/feeder Arc Fault Circuit Interrupter (AFCI). It detects parallel arcing faults to mitigate electrical fire risks in legacy installations, differing from newer combination-type AFCIs that also detect series arcs.
What is the difference between the BA120AF and the BA120AFC?
The BA120AF is a legacy branch/feeder AFCI, while the BA120AFC is a combination-type AFCI. The BA120AFC supersedes this model for modern code compliance, but the BA120AF remains available as an exact-match replacement for existing commercial systems.
How is the neutral connection handled on the BA120AF?
This breaker utilizes a pigtail neutral wire. The pigtail must be routed and terminated directly to the neutral bus bar in the panelboard to ensure the arc fault detection circuitry operates correctly.
Does the BA120AF require a dedicated neutral for the circuit?
Yes. Like most standard AFCI breakers, it requires a dedicated neutral for the branch circuit it protects. Shared neutrals in multi-wire branch circuits will cause the breaker to trip due to current imbalance.
Is the BA120AF rated for switching fluorescent lighting loads?
Yes, this breaker is SWD (Switching Duty) rated for 120VAC fluorescent lighting applications. It is also HACR rated for use with heating, air conditioning, and refrigeration equipment.
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