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Siemens B280 two-pole breaker, toggle actuator, bolt-on mount, grey plastic body

SIEMENS

SIEMENS B280 Miniature Circuit Breaker 80A 2 Pole 120/240V AC

SKU CH-ZRZ4-DA911

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.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $245.99
Pricier than about 84% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

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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