BF120AH fit detail: Siemens BF120AH is a Type BLHF high-interrupt GFCI breaker for bolt-on panelboard construction. It protects one 20-amp, 120-volt circuit and uses a neutral lead for its ground-fault sensing connection.
BF120AH specifications
-
Catalog number: BF120AH (also shown as US2:BF120AH)
-
Rating: 20A, 1-pole, 120VAC
-
Interrupting rating: 22kA
-
Protection level: Class A GFCI, 5mA
-
Mounting: Type BL bolt-on—not plug-in
Why this is not a residential QP breaker
The bolt-on bus interface and BL family determine where it can be used. A Siemens QF or QP plug-in breaker does not become compatible simply because its current and voltage match.
Panelboard review
Check the equipment label for BF/BLHF acceptance, then verify the 22kA requirement, conductor and neutral routing, lug range, and torque. Work on panelboard bus connections should be performed de-energized by a qualified electrician, followed by the prescribed GFCI test.