SIEMENS
SIEMENS B280 Miniature Circuit Breaker 80A 2 Pole 120/240V AC
Miniature circuit breaker rated 80 A, two-pole, 120/240 V AC with 10 kA interrupting rating for Siemens P1 panelboards
- 80 A rating protects high-demand circuits reliably
- 10 kA interrupting capacity clears faults safely
- Bolt-on mounting fits Siemens P1 panelboards directly
- Two-pole design handles 120/240 V AC systems
- Lug terminals accept 4 AWG copper or 2 AWG aluminium conductors
What it is and who it fits
The SIEMENS B280 is a 2 pole miniature circuit breaker rated 80 A at 120/240 V AC. It belongs to the BL series and carries a 10 kA interrupting rating at that voltage. The bolt-on mounting style is designed for Siemens P1 panelboards and load centers with a 125 A frame size. Electricians and facility managers use it for standard branch-circuit protection in compatible panels.
What to verify before ordering
Confirm that the panelboard is a Siemens P1 series unit with a 125 A frame size and available bolt-on spaces for a 2 pole breaker. The circuit must be single phase AC at 120/240 V and must not exceed the 10 kA available fault current. Lug terminals accept a minimum of 4 AWG copper or 2 AWG aluminium conductors. DC circuits are not supported because the breaker has no DC voltage rating.
Build quality and daily implications
The toggle actuator provides clear on/off indication and manual reset after a trip. Bolt-on mounting secures the breaker firmly to the panel bus, reducing vibration loosening in service. Lug terminals are factory-fitted for the stated wire sizes, so no separate connector kit is required. The 2 inch length, 3 inch width and 4 inch depth fit the standard P1 enclosure layout without crowding adjacent devices.
Highlights
- 80 A rating protects high-demand circuits reliably
- 10 kA interrupting capacity clears faults safely
- Bolt-on mounting fits Siemens P1 panelboards directly
- Two-pole design handles 120/240 V AC systems
- Lug terminals accept 4 AWG copper or 2 AWG aluminium conductors
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
What comes in the box with the SIEMENS B280 breaker and what must be purchased separately?
The breaker itself is supplied. Lug terminals accept 2 AWG aluminium or 4 AWG copper conductors that you provide. Mounting hardware for the P1 panelboard is not included.
Which version of the BL series 2-pole 80 A breaker should I select for a Siemens P1 panelboard?
Choose the bolt-on B280 rated 120/240 V AC with a 10 kA interrupting rating; it fits the 125 A frame size used in P1 load centres.
What does the 10 kA AIR rating mean once the breaker is installed in a panel?
It indicates the breaker can safely interrupt up to 10 000 amps of fault current at 120/240 V AC, protecting downstream wiring and equipment during a short circuit.
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