Westinghouse | NB21000S | Circuit Breaker | 1000A | 2-Pole | 600V

Introducing the Westinghouse NB21000S Circuit Breaker — a purpose-built solution for high-current protection in 600V electrical systems. With a robust 1000A rating and a two-pole design, this breaker delivers reliable, coordinated interruption to keep critical equipment and personnel safe during faults.

Designed for maintenance, retrofit, and replacement projects, the NB21000S is ideal when your panel or busbar setup requires a precise match to a 1000A, 2-pole, 600V specification. The part number NB21000S serves as the most reliable reference to ensure compatibility with your existing equipment.

Key specs at a glance

• Amperage: 1000A
• Poles: 2-Pole
• Voltage: 600V
• Part number: NB21000S

What makes this Westinghouse breaker stand out

• High-current capability for demanding service entrances, feeders, and main panels in commercial and light industrial settings.
• Two-pole design provides coordinated interruption for both hot legs, enhancing safety and trip reliability in 600V systems.
• Compatibility-first approach: use the exact NB21000S part number to confirm fit with your panel or retrofit project, reducing guesswork.
• Durable construction designed for long service life in installations that require steady performance under load.

Ideal use cases

• Retrofit installations where existing equipment calls for a precise 1000A, 2-pole, 600V breaker.
• Maintenance replacements in high-current commercial or light-industrial distributions.
• Upgrading panels to handle higher load demands without changing other protective devices.

Practical buying and installation notes

• Confirm fit and ratings before ordering to avoid mismatches and delays.
• The NB21000S part number is your best reference for compatibility; keep it handy when matching to catalogs and panel schedules.
• Consult your panel labeling and service manual to ensure correct mounting and electrical clearance for a 2-pole device.