Siemens BQ1B035H - 35 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQ1B035H is a 35A, 120V, 1-pole bolt-on molded case circuit breaker designed to shield your electrical system from overcurrent and short-circuit faults. Engineered for dependable protection in panelboards and load centers, this unit integrates seamlessly into Siemens OEM environments for a clean, reliable upgrade or replacement.

• Bolt-on mounting for a rigid, vibration-resistant connection: engineered to stay put in panels that experience movement or vibration, delivering a consistent, low-impedance bus connection and reducing contact wear over time.
• Thermal-magnetic trip unit: combines precise thermal overload protection with instantaneous magnetic trip for short circuits, delivering stable performance and predictable disconnection across fault conditions.
• 1-pole, 120V design: tailored for single-phase branch circuits in standard US electrical systems, supporting lighting, outlets, and select appliances that operate at 120V.
• 35A rating: provides targeted protection for mid-range circuits up to 35A, helping prevent wiring damage, nuisance trips, and electrical fires while remaining compatible with common residential and light commercial loads.
• OEM-compatible: designed to fit Siemens load centers and panelboards, making replacements straightforward and ensuring electrical balance within the panel.
• Versatile applications: ideal for residential installations, small offices, and light industrial environments where reliable single-pole protection at 120V matters.

Who benefits from the Siemens BQ1B035H? Homeowners upgrading a panel, electricians fielding a panelboard refresh, and facility managers overseeing light commercial electrical systems will appreciate a breaker that pairs easy installation with dependable protection. It’s particularly well-suited for circuits that don’t exceed 35 amps but require robust interruption capabilities to prevent damage and downtime.

Why this breaker matters in practice — the bolt-on design minimizes movement-induced contact issues, while the thermal-magnetic trip provides consistent protection across varying loads and fault scenarios. By aligning with Siemens panel architectures, it reduces calibration and compatibility concerns that can arise with aftermarket replacements, helping you maintain code compliance and system reliability.

Practical use scenarios include replacing aging single-pole breakers in existing Siemens panels, expanding a small office’s lighting/circuit infrastructure, or refreshing a residential panel where reliable 120V protection is needed without reconfiguring multi-pole circuits. Pair this breaker with appropriate conductors and panel space planning to optimize safety and reliability across your distribution network.

Technical snapshot:

• Manufacturer: Siemens
• Part Number: BQ1B035H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 35A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection