Siemens BQD340 - 40 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQD340 is a 40A, 480V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. Built to endure vibration and harsh electrical environments, its secure bolt-on mounting ensures a rigid, stable bus connection for consistent protection performance.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays reliable even in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both sustained overloads and short-circuit events, reducing nuisance trips and improving system uptime.
• 3-pole design for 3-phase systems with a 40A rating, ideal for balanced protection in commercial and light industrial applications.
• 480V rating suits higher-voltage panelboards and distribution gear, expanding compatibility beyond basic residential needs.
• Molded case, bolt-on style designed for straightforward installation and robust performance in OEM panelboards and load centers.
• OEM-compatible built to align with matching Siemens load centers and panelboards, ensuring seamless integration and reliable protection across installations.

Who benefits from the Siemens BQD340? electricians and facility managers upgrading or maintaining electrical distribution in homes, small to mid-size commercial spaces, and light-industrial environments. It’s particularly well-suited for panelboard and load center upgrades where a compact, reliable 3-phase protection solution is required, without compromising safety or performance.

Use cases and scenarios:

• Protect new or existing 3-phase branch circuits in commercial wiring runs, equipment rooms, or service panels.
• Upgrade aging protection in panelboards where a rugged bolt-on solution can resist vibration and movement in busy electrical rooms.
• Replace a failing breaker in Siemens OEM systems with a compatible, high-visibility 40A protection device that maintains coordinated protection with upstream devices.

Key specifications at a glance:

• Manufacturer: Siemens
• Part number: BQD340
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 480V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choosing the Siemens BQD340 means prioritizing long-term reliability, straightforward installation, and compatibility with Siemens’ panelboard ecosystems. When you equip your distribution system with this bolt-on molded case circuit breaker, you’re investing in a proven, high-performance solution that keeps critical circuits protected under varying loads and conditions. AmpState makes it easy to select the right Siemens protection for your 3-phase distribution needs, backed by real-world performance and support.