Siemens BQD190 - 90 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQD190 is a rugged, single-pole molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. With a 90A rating at 277V, it’s built to safeguard essential circuits in residential, commercial, and light industrial environments where steady power matters.

• Bolt-on mounting: Secure, vibration-resistant bus connections that stay tight under equipment vibration and routine maintenance, reducing the risk of loose contacts over time.
• Thermal-magnetic trip unit: Combines overload (thermal) protection with short-circuit (magnetic) protection for fast, stable trip performance across varying load conditions.
• OEM panel compatibility: Designed to be compatible with matching Siemens OEM loadcenters and panelboards for straightforward replacement and consistent protection characteristics.
• 1-pole design: Targeted protection for individual circuits, simplifying panel organization and troubleshooting.
• Versatile applications: Suitable for residential, commercial, and light industrial installations where 277V circuits are common, such as lighting, power distribution, and auxiliary systems.

Key benefits and practical use cases

When replacing a worn or unreliable breaker, the BQD190 provides a dependable, maintainable solution that fits seamlessly into Siemens-compatible panels. Its bolt-on construction is particularly advantageous in installations where vibration is a factor—think buildings with active HVAC equipment or mechanical loads that demand a steady electrical connection. The 277V rating makes it a solid choice for commercial lighting buses and other 277V circuits found in offices, retail spaces, and small industrial setups.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: BQD190
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90 A
• Voltage Rating: 277 V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choosing the Siemens BQD190 means prioritizing long-term reliability, straightforward installation, and compatibility with your existing Siemens panel infrastructure. If you need robust protection for 277V, 90-amp, 1-pole circuits in panelboards or loadcenters, this bolt-on breaker is purpose-built to keep your electrical system secure and running smoothly.