Westinghouse | NBY3900 | Circuit Breaker | 900A | 3-Pole | 600V | Bolt-On

Westinghouse NBY3900 Circuit Breaker is a rugged bolt-on, 3-pole protection device engineered for high-demand electrical systems. With a 900 A current rating and 600 V maximum, it delivers reliable interruption and safe isolation of large loads in industrial or commercial panels. Identified by the part number NBY3900, this breaker is designed for maintenance, retrofit, and replacement projects where exact specifications are required.

• Amperage: 900 A
• Poles: 3-Pole
• Voltage: 600 V
• Mounting: Bolt-On
• Reference: Part number NBY3900 (best reference for compatibility)
• Recommended use: Maintenance, retrofit, and replacement where matching specs are required

Why this Westinghouse circuit breaker stands out: its 900 A rating handles substantial electrical loads, while the 3-pole configuration supports balanced protection across multi-phase circuits. The bolt-on mounting enables secure, straightforward installation in compatible panels, making it a practical choice for both upgrading legacy systems and ensuring continued reliability in demanding environments.

Key compatibility and installation notes to guide your purchase: always confirm fit and ratings before ordering, and treat the NBY3900 as the best reference for compatibility with your panel or distribution board. For installers and facility managers, this part helps minimize downtime by aligning with existing specifications and mounting requirements.

Ideal scenarios include service panels and distribution gear that require a high-current, bolt-on, 3-pole solution at 600 V. Use this breaker for strategic maintenance windows, panel retrofits, or replacement cycles where exact spec alignment with the NBY3900 series is essential.