MBK125 - 125Amp Circuit Breaker

MBK125 - 125Amp Circuit Breaker

When you're replacing a main breaker, the catalog number is important—but the electrical ratings and intended equipment matter just as much. The MBK125 is a 125-amp, 4-pole main circuit breaker rated for 120/240V with a 22kA interrupting rating.

Key Features and Benefits

• 125 Amp Main Breaker: Rated at 125A for equipment requiring this specific main-breaker amperage.
• 4-Pole Configuration: The four-pole design is an important compatibility point when matching an existing MBK125 installation.
• 120/240V Rating: Clearly specified voltage makes it easier to confirm the breaker against the electrical requirements of the existing equipment.
• EQ9677 Main Configuration: Listed by the manufacturer as EQ9677 MAIN, providing another useful identifier for replacement checks.
• Meter Load Center Combo Main: The MBK125 is part of the Meter Load Center Combo Mains product family.

Technical Specifications

• Catalog Number / MFN: MBK125
  
• Article Number: US2\:MBK125
  
• Product Description: BREAKER 125A 4P 120/240V 22K EQ9677 MAIN
  
• Product Type: Main Circuit Breaker
  
• Product Family: Meter Load Center Combo Mains
  
• Amperage: 125A
  
• Poles: 4
  
• Voltage: 120/240V
  
• Interrupting Rating: 22kA
  
• Configuration: EQ9677 Main
  
• Supply Frequency: 60Hz
  
• Net Weight: 1.102 lb
  
• UPC: 783643267480
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The supplied manufacturer information lists UL under the product's general approval/standard information. That is the compliance detail that can be stated directly from the available product data.

Where It Works Best

The MBK125 is best considered for existing or legacy electrical equipment that specifically requires a 125A, 4-pole, 120/240V main breaker with the MBK125/EQ9677 configuration and the stated 22kA interrupting rating. Its association with the Meter Load Center Combo Mains product family is another important point to check when identifying the correct replacement.