Siemens BQD115 - 15 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQD115 is a precise, dependable protection solution for commercial and light industrial electrical systems. With a 15A rating at 277V and a single pole, this bolt-on molded case circuit breaker is engineered to shield branch circuits from overcurrent and short-circuit events—helping protect wiring, outlets, and connected equipment in panelboards and loadcenters.

Why engineers and electricians choose the Siemens BQD115

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing connection wear and improving long-term reliability in dynamic environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both overloads and short circuits, helping to minimize nuisance trips and maximize system uptime.
• OEM-compatible design ensures seamless integration with matching Siemens panelboards and other OEM loadcenters, simplifying upgrades, replacements, and maintenance.
• 277V, 1-pole, 15A configuration is ideal for commercial lighting circuits and other 277V applications, delivering targeted protection where it’s needed most.
• Molded case construction combines durability with compact form, making it a practical choice for space-constrained panels in residential-adjacent commercial settings.

What problems does it solve?

When branch circuits face overcurrent or a sudden fault, the BQD115 interrupts power quickly to prevent insulation damage, fire risk, and equipment failure. Its precise thermal-magnetic trip curve minimizes unnecessary shutoffs while still providing prompt protection in the event of a genuine fault. This makes it a reliable choice for ongoing equipment protection and safety compliance in panelboards and loadcenters.

Ideal use cases

• Replacing aging or failed breakers in business or light industrial electrical panels
• Upgrading 277V circuits within commercial lighting or low-voltage distribution systems
• Installing in new or retrofit projects where OEM compatibility and mechanical reliability matter
• Projects requiring a sturdy bolt-on connection to deter bus-bar movement in vibration-prone environments

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: BQD115
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 15A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Sold by AmpState, the Siemens BQD115 provides a focused, high-reliability solution for professionals who need precise protection in panelboards and loadcenters without compromising mounting integrity or OEM compatibility. For projects demanding dependable 277V single-pole protection with a robust bolt-on connection, this breaker is a practical, proven choice that keeps electrical systems safe and compliant.