Siemens HGB1B020B - 20 A, 347 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens HGB1B020B is a 20A, 347V, 1-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Its rugged design and precise protection make it a reliable cornerstone for commercial, light industrial, and updated residential electrical systems.

Why the HGB1B020B stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection that stays tight through busy electrical environments, reducing wiggle and maintaining consistent protection.
• Thermal-magnetic trip unit provides stable, repeatable protection performance, automatically adjusting to normal operating temperatures while quickly responding to overcurrent or short-circuit conditions.
• OEM-compatible design is built to integrate seamlessly with matching Siemens panelboards and load centers, simplifying installation and ensuring reliable operation within your existing system.
• 1-pole, 20A at 347V configuration targets specific branch circuits in commercial and light industrial settings, delivering focused protection where it matters most.

Ideal applications

Use the HGB1B020B for branch-circuit protection in panelboards and load centers across a range of environments:

• Commercial lighting, receptacle circuits, and small equipment feeds
• Retrofits and upgrades in existing Siemens installations
• Light industrial panel setups where reliable, vibration-tolerant protection is required

Technical snapshot

• Manufacturer: Siemens
• Part Number: HGB1B020B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 347V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical guidance for installation and maintenance

• Verify compatibility with your OEM panelboard or load center to ensure a perfect fit and reliable operation.
• Tighten bolt-on mounting hardware to the specified torque to preserve a solid bus connection and prevent unwanted movement during operation.
• In environments with vibration or frequent access doors, rely on the bolt-on design to maintain connection integrity and reduce nuisance trips.
• During routine inspections, check for signs of overheating, discoloration, or wear around the breaker and surrounding bus connections, and replace if performance appears degraded.