NB3900 - 900 Amp Circuit Breaker

NB3900 - 900 Amp Circuit Breaker

Unlock dependable protection for your high‑capacity electrical systems with the NB3900 900 A 3‑pole circuit breaker. Thoughtfully crafted for industrial and commercial maintenance, this powerhouse keeps your operations safe and running smoothly. With a 40 °C rating and a user‑friendly interchangeable trip unit, it adapts to your needs with ease. And thanks to included load‑side terminals, setup is straightforward and stress‑free—ideal for maintenance professionals who want quick, dependable results without fuss.

Key Features and Benefits

• Thermal‑Magnetic Protection: Built to defend your system against both long‑term overloads and sudden short circuits with precise sensitivity, offering optimal safety.
• Interchangeable Trip Unit: Swap or adjust trip units effortlessly to match evolving protection requirements—so you don’t have to replace the entire breaker.
• Load‑Side Terminals Included: Make your installation quicker and neater with terminals ready to go right out of the box.
• Tough NB Frame: Engineered on a proven NB frame known for long service life, delivering durable performance you can count on every day.
  

Technical Specifications

• Frame Type: NB
  
• Poles: 3
  
• Amperage: 900A
  
• Voltage Rating: 240 VAC • 480 VAC • 600 VAC
  
• Interrupting Capacity:
  • 42 kA @ 240 VAC
  • 30 kA @ 480 VAC
  • 22 kA @ 600 VAC
• Dimensions:
  • Width: 8.25 inches
  • Length: 16.00 inches
  • Depth: 5.50 inches
• Weight: 57 lbs
  
• Connection Type: Bolt‑On
  
• Type: Thermal‑Magnetic Circuit Breaker
  
• Temperature Rating: 40 °C
  
• Additional Features: Interchangeable trip unit, load‑side terminals
  

Material Compliance and Certifications

• Build Quality: Built using top‑grade materials and subject to rigorous testing, the NB3900 meets strict industry guidelines for safety and performance.
• Reliability: Each unit is checked under demanding conditions to ensure it delivers dependable operation in high‑stress environments.
  

Suitability

• In commercial facilities or industrial sites where existing high‑capacity breakers need to be serviced or updated, the NB3900 shines. Its high amperage handling, adjustable trip settings, and impressive interrupting capacity make it perfect for applications where uptime matters and replacement downtime must be minimized. Whether you're maintaining switchboards in manufacturing plants or upgrading systems in large commercial buildings, it fits right in and works without hassle.