Siemens BQD390 90A 3P 480V Circuit Breaker, Bolt-On | AmpState

The Siemens BQD390 is a rugged 90 A, 3-pole bolt-on circuit breaker designed for dependable overcurrent protection in panelboards, load centers, and electrical distribution systems. With a 480 V rating, it powers robust three-phase applications while keeping critical equipment safeguarded.

• Part number: BQD390 — Manufacturer: Siemens
• Amperage: 90 A
• Poles: 3
• Voltage: 480 V
• Mounting: Bolt-On for quick, secure installation
• Intended use: Circuit protection in panelboards, load centers, and electrical distribution

Why this BQD390 stands out: it’s a precise, direct-part-number match for Siemens installations, reducing sourcing guesswork and inventory complexity. The bolt-on mounting streamlines retrofits and field replacements, helping maintenance teams minimize downtime when a three-phase, 480 V circuit needs reliable protection.

Ideal for:

• Maintenance teams maintaining industrial control panels and distribution boards
• Panel builders stocking reliable Siemens components for fast builds
• Facilities managing spare breakers for critical 3-phase circuits

How it solves real problems:

• Exact compatibility with Siemens panelboards, ensuring a clean fit and proper protection without improvisation
• Fast installation through bolt-on mounting, which reduces commissioning time in the field
• Consistent, dependable 90 A protection for three-phase circuits in 480 V systems

AmpState makes this Siemens BQD390 available for quick procurement. If you’re unsure about fit or compatibility with your specific panel or distribution setup, send us a message and we’ll help confirm the correct match.