NGB1B125B - 125 Amp Circuit Breaker

NGB1B125B - 125 Amp Circuit Breaker

The NGB1B125B molded‑case circuit breaker delivers dependable, high‑performance protection for industrial and commercial electrical systems. Rated for 125 amps and engineered for panelboard mounting, this single‑pole breaker is built to keep power distribution safe and stable even under demanding conditions. With a 347 VAC voltage rating and strong interrupting capacity, the NGB1B125B is ready to guard your circuits from overloads and short‑circuit events — giving you peace of mind in critical applications.

Key Features and Benefits

• Strong Interrupting Capacity: Designed to handle short‑circuit conditions safely — the breaker supports up to 14 kA interrupting at 347 V and up to 25 kA at 277 V.
• Compact and Easy to Install: Its molded‑case design and standard 1‑pole format make for a simple, space‑saving installation in panelboards.
• Thermal‑Magnetic Trip Mechanism: Offers reliable, consistent circuit protection by combining overload and short‑circuit protection — ideal for typical electrical distribution uses.
• Ready for Real‑World Wiring: Accepts copper or aluminum conductors from 8 AWG up to 1/0 AWG (and beyond, per manufacturer data), giving flexibility for a variety of wiring configurations.

Technical Specifications

• Type: Molded‑Case Circuit Breaker (MCCB)
• Poles: 1 (single‑pole)
• Current Rating: 125 A
• Voltage Rating: 347 VAC (also compatible with 277 V systems at higher interrupting capacity)
• Interrupting Capacity:
  • 14 kA at 347 V
  • 25 kA at 277 V
• Trip Unit: Thermal‑magnetic (long‑time and instantaneous protection)
• Mounting: Panelboard / Bolt‑on bus tab
• Wire Compatibility: Accepts 8 AWG up to 1/0 AWG copper or aluminum (for load-side connection)

Material Compliance and Certifications

• Standards: The NGB1B125B meets foremost safety and compliance standards, including UL/CSA certification under UL‑489 and compliance with recognized guidelines for low‑voltage circuit breakers. It’s manufactured to accept standard load‑lug terminations, ensuring reliable connections and safe operation in demanding electrical environments.

Where It Works Best

• This breaker is ideal for a wide range of applications — from protecting lighting and receptacle circuits to safeguarding entire power‑distribution runs in commercial buildings, warehouses, or light‑industrial settings. When you need dependable, predictable protection that plays well with standard panelboards and wiring systems, the NGB1B125B is an innovative, efficient solution.