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Siemens BQD350 three-pole bolt-on breaker grey toggle

SIEMENS

SIEMENS BQD350 Circuit Breaker 50A 3 Pole 480V AC

SKU CH-GSN9-2F7SB

Three-pole miniature circuit breaker rated 50 A at 480 V AC with 14 kA interrupting capacity, bolt-on mounting and lug terminals for Siemens P1 panelboards

  • 50 A protection for three-phase circuits up to 480 V AC
  • 14 kA interrupting rating clears high fault currents safely
  • Bolt-on mounting fits Siemens P1 panelboards directly
  • Compact 4.5 × 3 × 2.7 in frame saves enclosure space
  • Rated for continuous operation at 104 °F ambient temperature

Industrial Circuit Protection

The SIEMENS BQD350 is a 50A three-pole miniature circuit breaker rated for 480V AC systems. It mounts by bolt-on connection into compatible Siemens P1 panelboards and load centers. The unit carries a 14kA interrupting rating at 480V AC for standard fault protection.

Sustained Load Performance

A 100A frame size provides thermal margin when the breaker carries 50A continuously. The maximum operating temperature of 104 degrees Fahrenheit defines the ambient limit for reliable operation. Standard toggle actuation gives clear on-off status during extended service periods.

Build and Installation

Bolt-on mounting secures the breaker firmly to the panelboard bus, resisting vibration in industrial environments. Lug terminals accept conductors sized for the 50A rating without special tools. The 4.5 by 3 by 2.7 inch footprint fits standard P1 series cutouts for straightforward panel integration.

Highlights

  • 50 A protection for three-phase circuits up to 480 V AC
  • 14 kA interrupting rating clears high fault currents safely
  • Bolt-on mounting fits Siemens P1 panelboards directly
  • Compact 4.5 × 3 × 2.7 in frame saves enclosure space
  • Rated for continuous operation at 104 °F ambient temperature

Specifications

BrandSIEMENS

Questions about this item

How much heat does the 50 A BQD350 produce when it runs continuously at full load?

The breaker is rated for a maximum operating temperature of 104 °F, so it will stay within that limit during continuous 50 A operation in a properly ventilated enclosure.

What panelboard must I already have to mount this bolt-on 3-pole breaker?

It is designed for Siemens P1 panelboards with a 100 A frame size and accepts standard lug terminals.

Will the 14 kA interrupting rating coordinate with older 10 kA breakers downstream in the same P1 panel?

The BQD350’s 14 kA at 480 V AC rating provides a higher interrupting capacity, allowing selective coordination with downstream 10 kA devices when properly applied.

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