ED42B125 - 125Amp Circuit Breaker

ED42B125 - 125 Amp Circuit Breaker

The ED42B125 molded case circuit breaker is designed to deliver dependable circuit protection in commercial and industrial electrical systems where consistent performance matters. Rated at 125 amps with a 2-pole configuration, this Sentron-style breaker helps safeguard electrical equipment and distribution circuits from overloads and short circuits. It features an interrupting rating of 18kA at 480VAC and 65kA at 240VAC, allowing it to respond effectively during fault conditions and protect connected components. Built on the ED4 frame platform, the breaker is commonly used in compatible panelboards and distribution equipment where a secure, bolt-on connection is preferred. The bolt-on mounting design provides a firm electrical and mechanical connection, helping maintain system stability over time. Designed for operation in environments up to 40°C, the ED42B125 is also HACR rated, making it suitable for heating, air conditioning, and refrigeration circuits. For added installation flexibility, the breaker includes load-side terminals and is approved for reverse feed applications, giving electricians more options when configuring power distribution systems.

Key Features and Benefits

• 125 Amp Rating – Provides reliable protection for medium-load electrical circuits.
• Two-Pole Design – Protects two conductors simultaneously, commonly used for 240V circuits.
• High Fault Interruption Capacity – Rated 18kA at 480VAC and 65kA at 240VAC to help manage short-circuit events.
• Bolt-On Mounting – Creates a secure connection to compatible panelboards and electrical distribution systems.
• ED4 Frame Platform – Designed for use with equipment that accepts ED-frame molded case circuit breakers.
• HACR Rated – Suitable for HVAC equipment including heating, air conditioning, and refrigeration systems.
• Reverse Feed Capable – Allows installation flexibility when system layout requires alternate power flow.
• Load-Side Terminals Included – Helps simplify installation and replacement work.

Technical Specifications

• Manufacturer Part Number: ED42B125
  
• Amperage Rating: 125A
  
• Poles: 2
  
• Frame Type: ED4
  
• Interrupting Capacity:
  • 18kA @ 480VAC
  • 65kA @ 240VAC
• Mounting Type: Bolt-On
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Reverse Feed: Suitable for reverse feed use
  
• Terminals: Load-side terminals included
  
• Approximate Shipping Weight: 2 lbs
  
• Height: 6.35 inches
  

Material Compliance and Certifications

• Industry Standards: The ED42B125 molded case circuit breaker is manufactured in accordance with industry-recognized electrical safety and performance standards commonly required for molded case circuit breakers used in North American power distribution systems.
• HACR Rating: Its HACR rating confirms compatibility with HVAC-related electrical loads, while the internal protection mechanisms are designed to meet typical expectations for thermal and magnetic trip protection in commercial and industrial environments.
  

Where It Works Best

• This 125A 2-pole ED4 frame circuit breaker is frequently used in commercial buildings, industrial facilities, and large residential electrical systems where reliable branch circuit protection is essential. It is commonly installed in panelboards, distribution panels, and HVAC power circuits, helping protect motors, compressors, and other electrical equipment from overload and short-circuit conditions. Electricians and maintenance professionals often rely on this breaker for equipment protection, electrical distribution upgrades, and replacement projects where a bolt-on ED-frame breaker is required.