Siemens BQ1B020H - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens BQ1B020H, a dependable 20-amp, 120-volt, 1-pole bolt-on molded case circuit breaker designed to shield your panelboard or loadcenter from overloads and short circuits. Built for real-world electrical protection, this compact unit fits seamlessly into residential, commercial, and light industrial electrical setups.

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, reducing the risk of loose connections and arc-causing movement over time.
• Thermal-magnetic trip unit ensures stable, repeatable protection for both overloads and short circuits, helping to minimize nuisance trips while maintaining critical circuit safety.
• OEM-compatible design engineered to work with matching Siemens loadcenters and panelboards, promoting reliable electrical performance and straightforward replacements.
• Versatile application suitable for a wide range of electrical environments—residential, commercial, and light industrial—where dependable branch circuit protection is needed.

Technical highlights

• Amperage rating: 20A
• Voltage rating: 120V
• Number of poles: 1
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Manufacturer: Siemens | Part number: BQ1B020H

This breaker is the right choice when you need immediate, reliable protection for branch circuits without sacrificing installation efficiency. The bolt-on design locks the breaker into a solid electrical path, which is especially valuable in environments with vibration or where panel access is frequent. The thermal-magnetic trip mechanism provides dependable response to both gradual overloads and sudden fault currents, helping to prevent wiring damage and equipment failure.

Ideal use scenarios

• Wiring new or existing residential panels where a 20A, 120V single-pole protection is required for lighting or receptacle circuits
• Upgrading aging panelboards in small offices or retail spaces that rely on robust, easy-to-replace breakers
• Home renovation projects where compatibility with Siemens loadcenters ensures a clean, code-compliant installation
• Parts replacement in environments where vibration resistance and secure connections are important for long-term reliability

Why this breaker stands out

Unlike generic substitutes, the Siemens BQ1B020H combines a bolt-on mounting approach with a thoughtful thermal-magnetic trip design, delivering predictable protection and a durable connection in demanding panel installations. Its OEM compatibility means fewer compatibility concerns during replacements or panel upgrades, helping you maintain code compliance and system integrity without guesswork. For technicians and homeowners who value reliability, straightforward serviceability, and precise protection, this 1-pole breaker is a practical, long-term solution.

Whether you're configuring a new panel or upgrading an older distribution board, the Siemens BQ1B020H delivers clear, dependable protection for your 20A, 120V circuits. Add it to your order from AmpState to ensure your electrical system stays safeguarded and compliant.