Siemens | NGB2B125B | Circuit Breaker | 125A | 2-Pole | 600V

Engineered for reliability and precise protection, the Siemens NGB2B125B circuit breaker delivers 125 amperes of overcurrent protection in a compact 2-pole package for 600V systems.

Designed for maintenance, retrofit, and replacement projects where your panel specs must align exactly, this NGB2B125B model fits where Siemens part numbers are the authoritative compatibility reference.

Key specifications

• Amperage: 125 A
• Poles: 2-Pole
• Voltage rating: 600 V
• Configuration: Two-pole design enabling simultaneous disconnection of both conductors

Why this 2-pole 125A breaker matters

In residential and commercial panels, a 2-pole 125A breaker protects circuits that draw higher currents or involve multi-wire branch configurations. With a 600V rating, it is suitable for a range of distribution equipment and industrial controls while maintaining safe shutdown of both lines in the event of a fault. This reduces the risk of arcing and ensures your equipment trips together, supporting code-compliant protection for shared-neutrals.

Ideal use cases

• Replacing a failed or worn-out 125A two-pole breaker in a Siemens-compatible panel
• Retrofit projects where existing equipment requires exact 125A, 2-pole, 600V specifications
• Upgrading older protection to a robust two-pole device that safeguards both hot conductors as part of a multi-wire branch circuit

How it compares to typical alternatives

Compared with smaller or single-pole devices, the NGB2B125B provides coordinated protection for two live conductors and immediate trip on faults affecting either pole. Its 600V rating expands applicability to higher-voltage distribution panels and industrial controls, delivering reliable protection where the full 125A capacity is required. Always verify that the exact part number matches the panel's acceptance, as the NGB2B125B is the best compatibility reference.

Note: Confirm fit and ratings before ordering. The part number is the best reference for compatibility.