Siemens NGB3B015B - 15 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens NGB3B015B is a dependable 3-pole bolt-on molded case circuit breaker designed to protect your electrical panels with precision. Rated for 15A and 600V, it delivers reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers across residential, commercial, and light industrial environments.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, reducing arcing risk and ensuring consistent performance even in high-vibration settings.
• Thermal-magnetic trip unit combines thermal overload protection with instantaneous magnetic trip for fast, repeatable response to both overloads and short circuits.
• OEM compatibility is built for seamless integration with matching Siemens panelboards and load centers, helping maintain system reliability and warranty integrity.
• Three-pole configuration ideal for protecting 3-phase circuits or multi-pole setups in modern electrical systems.

Technical snapshot

• Manufacturer: Siemens
• Part Number: NGB3B015B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 15A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection

Use cases and who benefits most

• Residential service panels undergoing circuit protection upgrades or additions that require reliable 3-pole protection for multi-wire branch circuits.
• Commercial equipment rooms where compact, vibration-tolerant, bolt-on protection supports steady operation and reduces maintenance calls.
• Light industrial distributions needing robust, standardized protection for 3-phase loads with known Siemens OEM compatibility.

Practical notes for installation and operation

• Pair this breaker with the corresponding Siemens panelboard or load center to preserve protection coordination and warranty eligibility.
• Follow standard electrical practices for bolt-on mounting to ensure a solid bus connection and proper torque on mounting hardware.
• Use the 3-pole design when protecting 3-phase circuits or multi-pole feeders to maintain synchronized disconnection during a fault.

For professionals seeking predictable, durable protection in panelboards and load centers, the Siemens NGB3B015B delivers consistent performance, precise protection, and reliable OEM compatibility—supporting safer, more maintainable electrical systems across a range of applications.