Siemens B120AFH AFCI Molded Case Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
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Siemens B120AFH - 20A AFCI Molded Case Circuit Breaker
New
Quantity
Description
Built to mitigate fire hazards, the Siemens B120AFH is a 20A branch/feeder AFCI breaker. It detects line-to-ground and line-to-neutral arcs in commercial and industrial settings. Featuring a bolt-on mounting style, this 1-pole breaker integrates into Siemens P1 through P5 panelboards. It accepts 14-8 AWG copper or 12-8 AWG aluminum wiring. Rated at 22kAIC for 120VAC systems, it utilizes thermal-magnetic trip technology and is HACR and SWD rated for switching duty.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B120AFH |
| Series | B |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 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 |
| Standards | CSA C22.2 No. 5, UL 1699, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Combination AFCI, Self-Test, Visual Trip Indicator, Insta-Wire |
Product FAQs
5 answersWhat panelboards are compatible with the Siemens B120AFH?
This bolt-on circuit breaker is designed for installation in Siemens P1, P2, P3, P4, and P5 commercial panelboards. It is not compatible with standard residential load centers that require plug-on connections.
What does the "H" in the B120AFH part number indicate?
The "H" designates a high interrupting rating. The B120AFH is rated at 22kAIC at 120V, compared to the standard B120AF which has a 10kAIC rating.
How is the neutral connection made on the B120AFH?
This breaker features a pigtail neutral connection. The attached coiled white wire must be routed and secured to the panelboard neutral bus to power the arc fault detection circuitry.
What type of faults does this breaker protect against?
The B120AFH provides standard thermal-magnetic protection against overloads and short circuits, plus arc fault (AFCI) protection to detect dangerous unintended arcing that can cause electrical fires.
Can the B120AFH replace a standard B120 breaker?
Yes, it can replace a standard 20A B-frame breaker when upgrading a circuit to meet AFCI code requirements. Note that the B120AFH requires a connection to the neutral bus, which a standard B120 does not.
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