Siemens B120DF Dual Function Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Quantity
Siemens B120DF - 20A Dual Function Miniature Circuit Breaker
New
Quantity
Description
Part of the BL series, the Siemens B120DF is a 1-pole, 20A dual function circuit breaker. It delivers combination arc-fault (AFCI) and 5mA ground-fault (GFCI) protection, ensuring NEC compliance for kitchens and laundries. With a secure bolt-on design, it installs into Siemens P1 through P5 panelboards and accepts 14-8 AWG copper wiring. Rated at 10 kAIC at 120VAC, this breaker includes a self-test feature and an LED trip indicator to quickly identify fault causes.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B120DF |
| Series | BL |
| 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 | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | Dual Function (AFCI/GFCI) |
|---|---|
| Available Options | Padlock Attachment |
| Accessories | None included |
| Standards | CSA C22.2 No. 5, UL 1699, UL 489, UL 943 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
Product FAQs
6 answersWhat panelboards are compatible with the Siemens B120DF circuit breaker?
The B120DF is a bolt-on BL series breaker designed specifically for use in Siemens P1, P2, P3, P4, and P5 panelboards. It is not compatible with standard plug-on residential load centers.
What does Dual Function mean on the B120DF breaker?
Dual function indicates that the breaker combines both Arc Fault Circuit Interrupter (AFCI) and Ground Fault Circuit Interrupter (GFCI) protection in a single device. This provides comprehensive protection against electrical fires caused by arcing and electrical shocks caused by ground faults.
Does the B120DF feature a pigtail neutral or a plug-on neutral connection?
This breaker features a standard pigtail neutral connection. The pigtail wire must be routed and connected directly to the neutral bus bar in your panelboard to ensure proper AFCI and GFCI functionality.
Is there a plug-on equivalent to the B120DF for residential load centers?
Yes. The Q120DF is the plug-on equivalent from the QP series, designed for standard Siemens load centers. The B120DF is a bolt-on BL series breaker intended for commercial panelboards.
What wire sizes are accepted by the lugs on the B120DF?
The load side lugs accept 14 to 8 AWG copper wire or 12 to 8 AWG aluminum wire.
What type of trip mechanism does the B120DF use?
It utilizes a fixed thermal-magnetic trip unit that provides long-time and instantaneous trip functions, combined with integrated ground-fault and arc-fault electronic protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 35 reviews.
- TSTom S.Verified BuyerReviewingSiemens B3100 3 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Superbreakers is our go to!
Great prices, great service and quick delivery.
- MGMaggie G.Verified BuyerReviewingSiemens B250 - 50A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/24/26Great Service
Came in great condition and in an incredibly timely manner. Will continue superbreakers for all of my orders in the future!
- DBDonnie B.Verified BuyerReviewingSiemens B115 - 15A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/11/26New Breaker
Awesome breaker & Superbreakers is a awesome company!
- BLBrian L.Verified BuyerReviewingSiemens B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/4/26Brian
Works great
- JFJoseph F.Verified BuyerReviewingSiemens B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/23/26Great value
It was a great value