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Siemens B120AF AFCI Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Siemens
B120AF
AFCI Miniature Circuit Breaker
Brand
Siemens
SKU
B120AF
Quantity
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Siemens B120AF - 20A AFCI Miniature Circuit Breaker
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20A AFCI Miniature Circuit Breaker
20A AFCI Miniature Circuit Breaker
Description
Part of the BAF series, this 20-amp branch/feeder arc-fault circuit breaker delivers reliable protection against parallel arcing faults. The Siemens B120AF features a bolt-on mounting style, ensuring a robust connection within Siemens P1, P2, P3, P4, and P5 panelboards. Rated for 10 kAIC at 120VAC, it includes a pigtail neutral and is HACR and SWD rated for switching 120V fluorescent lighting loads. Note that this legacy branch/feeder model has been superseded by the BA120AFC combination AFCI.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B120AF |
| Series | BAF |
| 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, P4, P5 Panelboards |
| Wire Gauge | 14-10 AWG (Cu), 12-10 AWG (Al) |
| Max Wire | 10 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, UL 1699, UL 489 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Branch/Feeder AFCI |
Product FAQs
6 answersCan I use the B120AF in a standard Siemens residential load center?
No. The B120AF features a bolt-on mounting style designed specifically for Siemens P1, P2, P3, P4, and P5 commercial panelboards. For standard Siemens plug-on load centers, you will need a plug-on equivalent like the Q120AF or QA120AFC.
What type of arc fault detection does the B120AF provide?
The B120AF is a branch/feeder arc-fault circuit interrupter (AFCI). It is designed to detect parallel arcing faults in branch and feeder wiring. This legacy model has been largely superseded by combination AFCI breakers which detect both parallel and series arcs.
What is the combination AFCI equivalent for the B120AF?
The legacy branch/feeder B120AF has been superseded by the Siemens BA120AFC. The BA120AFC is a combination AFCI breaker that provides both parallel and series arc fault protection while maintaining the same bolt-on form factor for P1 through P5 panelboards.
What is the plug-on equivalent for the B120AF?
If you need a 20A single-pole AFCI for a plug-on Siemens load center rather than a bolt-on panelboard, the equivalent models are the Q120AF for branch/feeder protection or the QA120AFC for combination AFCI protection.
How is the neutral connection made on the B120AF?
The B120AF includes a pigtail neutral wire. During installation, this coiled white pigtail must be connected directly to the panelboard neutral bus bar to power the internal AFCI circuitry and ensure proper arc fault detection.
Is the B120AF rated for switching fluorescent lighting loads?
Yes, the Siemens B120AF is SWD (Switching Duty) rated, meaning it is approved for switching 120VAC fluorescent lighting loads on a regular basis. It is also HACR rated for use with heating, air conditioning, and refrigeration equipment.
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