Westinghouse | NB3900S | Circuit Breaker | 3-Pole | 600V | Bolt-On

Westinghouse NB3900S Circuit Breaker is a robust 3-pole, 600V bolt-on protective device designed for reliability in demanding electrical environments. Whether you’re maintaining an existing installation, retrofitting a panel, or replacing a worn breaker, NB3900S delivers precise protection and straightforward serviceability.

Key specifications

• Poles: 3-Pole
• Voltage rating: 600V
• Mounting: Bolt-On
• Part reference: NB3900S

Why choose NB3900S for your system

• Reliable three-phase protection: The 3-pole design provides balanced interruption across all three conductors in a three-phase circuit, minimizing voltage imbalances during faults.
• Fast, bolt-on installation: The bolt-on format simplifies mounting to compatible panels, reducing downtime and enabling quicker service windows.
• Clear compatibility path: The part number NB3900S is the best reference for ensuring you’re selecting the exact replacement for your panel or control system.
• Versatile use cases: Ideal for maintenance schedules, panel retrofits, and replacements in industrial and commercial power distribution where 600V operation is standard.
• Durable construction for long service life: Designed to withstand regular switching and fault events typical in demanding environments.

Use cases and installation considerations

• Maintenance and replacements in Westinghouse panels and other compatible switchgear that require a 3-pole, 600V bolt-on breaker.
• Retrofits where newer frame designs must match the existing bus and trip characteristics.
• Before ordering, double-check fit and ratings against your panel labeling; NB3900S is the best compatibility reference.
• During installation, ensure the power is fully de-energized and follow all safety procedures per your site’s protocol.

With Westinghouse NB3900S, you get a proven protective device that aligns with established electrical standards while offering straightforward serviceability. For a precise replacement that meets your three-phase, 600-volt needs, rely on the NB3900S part number as your definitive reference.