Siemens HB3B020 - 20 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Siemens HB3B020 — a 20A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for stability in real-world electrical environments, it combines a secure mounting mechanism with precise protective action you can depend on.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays tight under mechanical stress and operational vibrations.
• Thermal-magnetic trip unit delivers stable, repeatable protection by cooperatively managing overload (thermal) and short-circuit (magnetic) events for consistent performance over time.
• OEM-compatible design is engineered to work seamlessly with matching Siemens OEM load centers and panelboards, simplifying installation and reducing stocking complexity for installers.
• 3-pole configuration for 3-phase systems—ideal for commercial and light industrial applications that require reliable protection across three phases, as well as certain residential setups where 3-phase distribution is present.
• Molded-case construction balances compact form with robust protection, making it a practical fit for standard panels without crowding or overheating concerns.

Technical specifications

• Manufacturer: Siemens
• Part Number: HB3B020
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who should consider the HB3B020? electrical professionals installing or upgrading panelboards and load centers that require dependable 3-phase protection, facilities managers maintaining commercial spaces, and contractors replacing worn or mismatched breakers in Siemens-compatible systems. Its bolt-on design simplifies installation in compatible panels, while the thermal-magnetic trip ensures fast, accurate response to faults, helping minimize downtime and protect wiring and equipment.

Use cases include kicking off three-phase feeder protection for commercial office suites, small manufacturing or processing lines, and HVAC equipment circuits where 240V power is standard. If you’re updating a Siemens panel or stocking a reliable, OEM-aligned breaker for service calls, the HB3B020 is purpose-built to deliver consistent protection when it matters most.

Ready to optimize your panel protection with a trusted Siemens solution? Add the HB3B020 to your cart and secure precise, durable, 3-pole protection for your 240V circuits.