Siemens BQ1B050 - 40 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQ1B050 delivers dependable protection for branch circuits in panelboards and load centers with a focus on reliability, safety, and easy installation. This 40A, 120V, 1-pole bolt-on molded case circuit breaker is built to endure the demands of residential, commercial, and light industrial environments, giving you a solid safeguard against overcurrent and short circuits.

• Bolt-on mounting provides a secure, vibration-resistant bus connection for a stable, long-lasting electrical path.
• Thermal-magnetic trip unit ensures stable, repeatable protection across varying temperatures and load conditions, helping minimize nuisance trips while safeguarding wiring and devices.
• 1-pole, 40A at 120V configuration fits common circuit needs in homes and small workplaces, simplifying panel planning and replacements.
• OEM compatibility designed to work with matching Siemens panelboards and load centers, streamlining upgrades and substitutions without compatibility concerns.
• Versatile application ideal for residential, commercial, and light industrial electrical systems that require reliable branch circuit protection.

Use cases and value in real-world setups: install the BQ1B050 in Siemens panelboards to protect heavy-load circuits, retrofit older installations with a robust bolt-on breaker, or replace a failed unit in a residential or light commercial service. The combination of a secure bolt-on connection and a dependable thermal-magnetic trip helps you maintain circuit integrity in busy electrical rooms where vibration or temperature swings are a factor.

Technical Specifications

• Manufacturer: Siemens
• Part Number: BQ1B050
• 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

Why choose the Siemens BQ1B050? It’s specifically engineered to pair with Siemens panelboards and load centers, delivering a trusted, consistent protection profile across a range of environments. The bolt-on design minimizes connection looseness under vibration, while the thermal-magnetic trip unit provides predictable performance even as outdoor temperatures and load demands fluctuate. If you’re stocking parts for Siemens-based installations, this 40A, 120V, 1-pole breaker is a precise, reliable fit that helps keep electrical systems running smoothly and safely.