Siemens B2020 - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens B2020 is a 20A, 120V, 1-pole bolt-on molded case circuit breaker designed to protect individual branch circuits within panelboards and load centers. It delivers dependable overcurrent and short-circuit protection with smooth, predictable trip characteristics you can rely on during daily operation.

Why choose a bolt-on design? The secure bolt-on mounting creates a rigid, vibration-resistant bus connection, reducing loose contacts and intermittent trips in panels that experience movement or vibration. The thermal-magnetic trip unit offers fast, stable responses to both sustained overloads and short-circuit events, helping to minimize nuisance trips and equipment damage.

• Secure bolt-on mounting: Provides a rigid, vibration-resistant bus connection for reliable long-term performance.
• Thermal-magnetic protection: Combines thermal and magnetic tripping for stable, repeatable protection across diverse load profiles.
• OEM-compatible: Designed to be compatible with matching Siemens OEM load centers and panelboards for straightforward installation and dependable fit.
• Versatile applications: Suitable for residential, commercial, and light industrial environments where dependable branch-circuit protection is essential.

Technical specifications

• Manufacturer: Siemens
• Part Number: B2020
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and scenarios

Ideal for upgrading or stocking spare breakers in any panel that accepts bolt-on, one-pole devices. Install this 20A, 120V breaker to protect lighting circuits, receptacle runs, small appliance circuits, or dedicated equipment feeds in homes, small offices, retail spaces, or light manufacturing setups. Because of its OEM compatibility, it integrates smoothly with existing Siemens panels, ensuring a clean electrical protection strategy without mismatches or retrofit hassles.

Practical tips for best results

• Verify that your panel accepts bolt-on, single-pole breakers of the B2020 family before replacement.
• Keep a spare on hand for quick maintenance and minimize downtime when a branch circuit trips.
• Pair with adjacent breakers of the same family in the same panel to ensure consistent performance and trip characteristics.