Siemens NGG1B030 - 30 A, 347 V, 1-Pole Circuit Breaker | AmpState

Meet the Siemens NGG1B030 — a 30A, 347V, 1-pole molded case circuit breaker built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With a compact silhouette and Siemens engineering behind it, this breaker fits where space is at a premium without compromising protection.

• Compact molded case design maximizes panel space and simplifies alignment in tight panel layouts, helping you fit more circuits without crowding the enclosure.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal overload sensing with magnetic short-circuit protection, so you get fast, predictable tripping when it matters most.
• 347V rating ideal for commercial and light industrial distribution networks where higher line voltage is used, ensuring reliable protection across the system.
• 30A rating provides targeted protection for typical branch circuits such as lighting runs, small equipment feeders, and receptacle circuits—reducing the risk of damage from overcurrent while minimizing unnecessary trips.
• 1-pole design offers dedicated protection for a single circuit, enabling clean, straightforward wiring and circuit isolation in panelboards.
• OEM compatibility guaranteed with matching Siemens load centers and panelboards, ensuring proper fit, terminal torque, and seamless electrical performance.

Perfect for: commercial electrical rooms, light industrial installations, and spaces that use 347V distribution where reliable single-pole protection is needed. If you’re upgrading or replacing an existing Siemens panel, NGG1B030 ensures compatibility and minimizes downtime while maintaining system safety.

Why it matters — A molded case breaker like the NGG1B030 isn’t just a plug-in component. It’s the first line of defense against overloads and short circuits, safeguarding wiring, equipment, and occupants. The thermal-magnetic trip mechanism provides predictable response, so you’re less likely to experience nuisance trips during normal inrush, and more likely to stay protected during faults.

Quick specs at a glance:

• Manufacturer: Siemens
• Part Number: NGG1B030
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 347V
• Number of Poles: 1
• Application: Branch circuit overcurrent and short-circuit protection
• Compatibility: Compatible with matching Siemens OEM load centers and panelboards

Practical tips for installation and use: verify the panel’s acceptable part numbers before swapping, ensure the terminals are torqued to the manufacturer’s specification, and use this 1-pole 30A breaker for single-circuit protection within the 347V distribution system. By matching the NGG1B030 to your Siemens panel, you’ll maintain electrical coordination, simplify maintenance, and keep your electrical system running smoothly.