NB125 - 125Amp Circuit Breaker

NB125 - 125Amp Circuit Breaker

The NB125 125 amp circuit breaker is designed to protect 120/240V electrical systems that carry higher electrical loads. This 2-pole, bolt-on breaker uses a thermal magnetic trip mechanism to help guard against both overloads and short circuits. With a 125A rating and a 10kA interrupting capacity, it’s commonly used in commercial and residential panelboards where dependable performance is required. The bolt-on connection provides a tight, secure fit to the panel bus, which helps maintain proper contact over time. For electricians replacing an existing NB frame breaker, the NB125 offers a practical, no-nonsense solution for maintaining circuit protection.

Key Features and Benefits

• 125 Amp Rating: Suitable for circuits requiring up to 125 amps of protection.
• 2-Pole Configuration: Designed for use on 120/240VAC systems.
• Bolt-On Mounting: Attaches securely to compatible panelboards.
• Thermal Magnetic Trip: Helps protect against sustained overloads and instantaneous short circuits.
• 10kA A.I.C. Rating: Rated to interrupt up to 10,000 amps at 120/240VAC.

Technical Specifications

• Model: NB125
  
• Amperage: 125A
  
• Poles: 2
  
• Voltage Rating: 120/240VAC
  
• Interrupting Rating: 10kA @ 120/240VAC
  
• Frame Type: NB
  
• Mounting Type: Bolt-On
  
• Dimensions: 2.00" W x 4.25" L x 2.31" D
  
• Weight: 2.25 lbs
  

Material Compliance and Certifications

• The NB125 is built to meet standard industry requirements for molded case circuit breakers. It is intended for installation in properly rated electrical equipment and panelboards. As with any breaker replacement, compatibility with the panel should be verified prior to installation.

Where It Works Best

• This 125 amp double pole breaker is often used in commercial buildings, light industrial spaces, and larger residential applications. It works well in panelboards supplying power to HVAC systems, subpanels, and other 240V equipment. If you’re replacing an NB frame breaker or performing routine electrical maintenance, the NB125 is a straightforward option for restoring circuit protection.