Siemens NGB3B030B - 30 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens NGB3B030B, a 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in panelboards and loadcenters. Rated for 30A and up to 600V, it’s built to keep residential, commercial, and light industrial wiring safe from overloads and short circuits, with a mounting design that stays secure through years of operation.

• Secure bolt-on mounting—provides a rigid, vibration-resistant bus connection, minimizing movement and wear in environments with equipment vibration or enclosure flex.
• Thermal-magnetic trip unit—combines temperature-sensitive and magnetic protection for stable, repeatable response to overloads and short circuits across varying conditions.
• OEM-compatible design—specifically engineered to work with matching Siemens loadcenters and panelboards for a cohesive, reliable protection solution.
• 3-pole configuration—supports 3-phase distribution, ensuring simultaneous disconnection across all phases for safer, coordinated shutdowns.
• Versatile application—well-suited for residential, commercial, and light industrial electrical systems that require robust, code-compliant overcurrent protection.

This NGB3B030B device addresses common installation and performance concerns. The bolt-on style delivers a more secure connection in panels where vibration, panel door slam, or frequent maintenance could otherwise loosen a lugless mount. The thermal-magnetic trip mechanism provides predictable tripping behavior, reducing nuisance trips while ensuring fast disconnection during genuine faults. When paired with Siemens OEM panelboards and loadcenters, you gain coordinated protection that aligns with the rest of your electrical system for safer, more reliable operation.

Technical snapshot

• Manufacturer: Siemens
• Part Number: NGB3B030B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Whether you’re upgrading an aging panel, configuring a new electrical install, or refreshing a distribution system in a light industrial setting, the Siemens NGB3B030B delivers the reliability you expect from a proven Siemens component, with installation and performance that align with everyday field needs. For a cohesive protection strategy, pair this 30A, 600V, 3-pole bolt-on breaker with compatible Siemens panelboards to ensure smooth operation, predictable protection, and long-term service life.