Siemens BQ1B050H - 50 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQ1B050H is a dependable, bolt-on molded case circuit breaker engineered for robust branch-circuit protection in panelboards and load centers. With a 50A rating at 120V and a single pole, this device delivers precise, reliable protection where it matters most—preventing overloads and short circuits from compromising your electrical system.

• Bolt-on mounting for a secure, vibration-resistant connection—the bolt-on design delivers a rigid bus connection that stays seated through equipment vibration and routine panel maintenance, reducing loosening trips and erratic performance.
• Thermal-magnetic trip unit for stable, repeatable protection—combines thermal delay with magnetic instantaneous action to guard against sustained overloads and high fault currents, helping protect wiring and connected loads.
• OEM-compatible for trusted panel performance—matched to Siemens loadcenters and panelboards to ensure proper fit, reliable trip characteristics, and seamless integration with your existing protection scheme.
• Versatile for residential, commercial, and light industrial environments—a practical choice for kitchens, offices, small shops, and service panels where dependable, code-compliant protection is essential.
• 1-pole, 50A, 120V specification—compact yet powerful, designed to protect a single branch circuit with straightforward replacement in compatible Siemens panels.

Why this breaker matters in your electrical system

Branch circuits rely on precise protection to prevent damage from overloads and short circuits. The BQ1B050H’s thermal-magnetic trip curve provides predictable release behavior across typical temperature ranges, ensuring you’re not left guessing when a fault occurs. Its molded-case construction delivers solid durability, while the bolt-on mounting keeps the device firmly connected to the bus, minimizing nuisance trips caused by loose connections or panel movement.

Key use cases

• Replacing a failed or worn-out breaker in compatible Siemens panelboards or loadcenters without compromising system integrity.
• Adding or upgrading a single branch circuit to 50A protection in residential or light commercial installations, with appropriate conductor sizing and code-compliant wiring practices.
• Retrofits and service panel upgrades where maintaining OEM compatibility and consistent trip performance is critical for reliability and safety.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQ1B050H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal for electricians and facilities builders seeking a reliable, code-compliant protection device from a trusted brand, the Siemens BQ1B050H offers straightforward installation, durable construction, and predictable performance in a compact, single-pole package. Available through AmpState, it’s a solid choice when your panelboard or load center requires dependable 50A protection at 120V.