Siemens NGB1B020B - 20 A, 347 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens NGB1B020B—a precision-built, 1-pole bolt-on molded case circuit breaker designed to protect your most critical branch circuits. With a 20A rating and a 347V operation, this device is engineered for dependable performance in panelboards and load centers, delivering reliable protection where it matters most.

Why this bolt-on breaker stands out

• Secure, vibration-resistant mounting: Bolt-on installation creates a rigid, stable connection to the bus, minimizing movement and loosening in environments with vibration or frequent access.
• Thermal-magnetic protection you can rely on: An integrated thermal-magnetic trip unit provides fast, predictable responses to both overloads and short circuits, maintaining protection across temperature variations.
• Siemens OEM compatibility: Designed to integrate seamlessly with matching Siemens load centers and panelboards, simplifying installation, service, and future upgrades.
• Targeted use cases: Ideal for residential circuits, light commercial equipment, and small industrial feeders where single-pole 20A protection at 347V is appropriate.

Technical specifications

• Manufacturer: Siemens
• Part number: NGB1B020B
• 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

Who should consider this breaker

Electricians and facility managers upgrading panelboards or load centers that require robust, vibration-resistant connections and dependable single-pole protection will find the NGB1B020B a practical choice. It’s well-suited for commercial spaces, multi-residential buildings, and light industrial applications where 347V branch circuits demand reliable 20A protection.

Installation tips and best practices

• Ensure your panelboard is compatible with Siemens NGB1B0x0 series breakers before installation.
• Use proper bolt-on mounting hardware and follow torque specifications to secure the bus connection.
• Plan for future maintenance by pairing with the appropriate Siemens-compatible accessories and enclosures.