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Grey Siemens BQD340 three-pole breaker with toggle actuator, bolt-on mounting, lug terminals, compact industrial finish

SIEMENS

SIEMENS BQD340 Miniature Circuit Breaker 40A 3 Pole 480V AC

SKU CH-J90X-85TAY

Provides 40 A three-phase protection at 480 V AC with a 14 kA interrupting rating for Siemens P1 panelboards

  • 40 A three-pole protection for 480 V AC circuits
  • 14 kA interrupting rating at 480 V AC ensures reliable fault clearance
  • Bolt-on mounting fits directly into Siemens P1 panelboards
  • 100 A frame size in a compact 4.5 × 3 × 2.7 in body
  • Rated for continuous operation up to 104 °F ambient temperature

SIEMENS BQD340 40A 3-Pole Breaker

The SIEMENS BQD340 is a miniature circuit breaker rated at 40 amps and 480V AC with three poles. It belongs to the BQD series and uses a standard toggle actuator. This breaker is designed for bolt-on mounting in compatible Siemens P1 panelboards and load centers. It suits electrical contractors and facility managers needing reliable branch-circuit protection.

Bolt-on installation in P1 panelboards

The breaker mounts directly onto the bus bars of Siemens P1 series panelboards using a bolt-on connection. Its frame size is 100A/BQD and terminal connections use lugs. Physical dimensions are 4.5 inches in length, 3 inches in width and 2.7 inches in depth. Ensure the panelboard series matches exactly; this unit will not fit other panelboard families or DIN rail assemblies.

14kA interrupting rating at 480V AC

The maximum AIR rating is 14kA at 480V AC, which determines the fault current the breaker can safely interrupt. The DC voltage rating is not rated and the maximum operating temperature is 104 degrees Fahrenheit. Buyers whose systems require a higher interrupting capacity or DC-rated protection must select a different device.

How it compares

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

Price $613.99
Pricier than about 91% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

How do I confirm the breaker is operating correctly after installation?

After bolting the unit into the P1 panelboard, verify the toggle moves firmly to ON and OFF, measure 480 V AC across all three poles under load, and confirm the 14 kA interrupting rating matches the available fault current at the point of installation.

What comes in the box and what must be purchased separately?

The breaker itself is supplied with integral lug terminals for bolt-on mounting; compatible Siemens P1 panelboard, mounting hardware, and any required bus bars or connectors are not included and must be sourced separately.

Which BQD series version should I select for a 40 A three-phase circuit?

Choose the BQD340 model rated 40 A, 3 pole, 480 V AC with a 14 kA AIR rating and 100 A frame size, ensuring the panelboard is a Siemens P1 series and the ambient temperature does not exceed 104 °F.

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