Siemens BQD315 - 15 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens BQD315 — a 15A, 480V, 3-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Equipped with a thermal-magnetic trip unit, it provides stable, repeatable protection against overcurrent and short circuits across a range of commercial and light industrial environments.

• Secure bolt-on mounting: A rigid, vibration-resistant bus connection that stays locked in, even in demanding electrical rooms.
• Thermal-magnetic trip: Combines precise magnetic tripping for instant fault detection with thermal delay to accommodate varying load conditions for consistent protection.
• OEM-compatible: Engineered to fit matching Siemens OEM load centers and panelboards for seamless integration and dependable trip characteristics.
• 3-pole, 15A, 480V: Ideal for protecting 3-phase circuits feeding motors, compressors, HVAC equipment, and other multi-wire loads in commercial and light industrial settings.

Who benefits most from the BQD315? electrical designers, facilities managers, and field technicians seeking a robust, easy-to-install solution that aligns with Siemens panelwork and delivers predictable performance in vibration-prone environments. It’s an excellent choice when upgrading panels, protecting new 3-phase circuits, or stocking a reliable spare that mirrors OEM specifications.

What makes it stand out

• Reliability under real-world conditions: The bolt-on design reduces connection looseness and minimizes downtime caused by bus-bar movement, which is crucial in busy panelhouses.
• Consistent protection across loads: The thermal-magnetic trip curve ensures a fast response to short circuits while avoiding nuisance trips on normal load fluctuations.
• Direct compatibility with Siemens ecosystems: Using identical trip characteristics and mounting geometry as other Siemens devices simplifies wiring, labeling, and future expansions.

Technical specifications at a glance

• Manufacturer: Siemens
• Part number: BQD315
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 15A
• Voltage: 480V
• Poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips for installation and use: verify that your panelboard is compatible with bolt-on breakers in the Siemens ecosystem, ensure proper torque on mounting hardware per Siemens installation guidelines, and align the device with your panel’s labeling and protection planning. For maintenance, test the trip function periodically in accordance with local electrical codes and your facility’s preventive maintenance schedule. The BQD315 is a robust, field-ready choice for dependable 3-phase protection in commercial, residential-light industrial, and multi-unit systems.