Siemens BQ1B040H - 40 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQ1B040H is a 40A, 120V, 1-pole bolt-on molded case circuit breaker designed to protect branch circuits in panelboards and load centers with precision and reliability. Crafted by Siemens, this unit delivers dependable overcurrent and short-circuit protection while fitting seamlessly into compatible OEM panel systems. It’s an ideal solution for residential, commercial, and light industrial electrical installations where consistent performance matters.

• Secure bolt-on mounting: a rigid, vibration-resistant connection to the bus bar ensures stable conductivity and reduces the risk of loose contacts over time.
• Thermal-magnetic trip unit: combines thermal overload protection with instantaneous magnetic trip, delivering stable, repeatable protective behavior across varying load conditions.
• 1-pole, 40A, 120V design: targeted protection for individual branch circuits that require 40 amps at standard residential/commercial voltages.
• OEM-compatible: engineered to be a drop-in match for Siemens load centers and panelboards, simplifying replacements and upgrades.
• Versatile applications: well-suited for a range of environments—from home electrical panels to light commercial and industrial installations—where reliable circuit protection is essential.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQ1B040H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical scenarios where the BQ1B040H shines include upgrading aging panels, replacing failed breakers in Siemens ecosystems, or provisioning new circuits in residential and light commercial setups. When selecting a replacement or expansion, this 1-pole, 40A bolt-on solution provides a reliable balance of fast short-circuit response and predictable overload protection, all while maintaining compatibility with Siemens’ panelboard ecosystems. Trust AmpState to supply a component that aligns with your panel’s design and your project’s safety requirements.