ED42B125 - 125Amp Circuit Breaker

ED42B125 - 125Amp Circuit Breaker

Looking for a circuit breaker that delivers both reliability and peace of mind? The Siemens ED42B125 is a 125 Amp, 2-pole molded case circuit breaker designed to keep your electrical systems running smoothly in demanding commercial and industrial environments. As part of the trusted Siemens Sentron ED frame family, it’s built to integrate seamlessly into compatible existing systems—making replacements or upgrades quick, easy, and hassle-free.

Whether you're protecting branch circuits or critical equipment, the ED42B125 is engineered to help you stay ahead of electrical issues before they become costly problems. It provides dependable protection against overloads and short circuits, helping reduce downtime and extend the life of your electrical infrastructure. Simply put, it’s a hardworking solution designed to support your operation day in and day out.

Key Features and Benefits

• Trusted Siemens Sentron ED frame molded case circuit breaker
• 125 Amp continuous current rating for dependable operation
• 2-pole configuration ideal for 480V AC systems
• Thermal magnetic trip unit for responsive overload and short-circuit protection
• 18kA interrupting capacity (18kAIC) at 480V AC
• Includes load lugs (TA1E6125) for secure and easy wiring
• Compatible with 3–3/0 AWG copper or 1–2/0 AWG aluminum conductors
• Designed for standard 40°C operating conditions
• Seamless form, fit, and function replacement for Siemens ED-frame equipment
• Built for demanding commercial and industrial applications
  

Technical Specifications

• Catalog Number: ED42B125
  
• Manufacturer: Siemens
  
• Product Type: Molded Case Circuit Breaker
  
• Series / Frame: ED Frame (Sentron)
  
• Trip Unit: Thermal Magnetic
  
• Amperage Rating: 125 Amps
  
• Voltage Rating: 480V AC
  
• Number of Poles: 2
  
• Interrupting Rating: 18kAIC at 480V AC
  
• Terminal Type: Load Lugs Only (TA1E6125)
  
• Wire Range: 3–3/0 AWG Copper / 1–2/0 AWG Aluminum
  
• Reference Operating Temperature: 40°C
  
• Dimensions:
  • Width: 2.00 in.
  • Height: 6.35 in.
  • Depth: 3.92 in.
• Weight: 2.599 lb.
  
• Product Family: ED4 18kAIC, 480VAC
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Siemens ED42B125 meets key industry standards, including UL 489 and IEC 60947-2, ensuring reliable performance and safety. It is RoHS compliant (since March 31, 2009), aligns with WEEE (2012/19/EU) requirements where applicable, and includes REACH Article 33 material transparency information. For best results, installation should always be performed by qualified electrical professionals in accordance with NEC and local codes.

Where It Works Best

• Siemens ED-frame panelboards and compatible distribution equipment
• Commercial and industrial electrical systems
• 480V AC branch circuit protection
• Warehouses, manufacturing facilities, and commercial buildings
• Maintenance and upgrades of existing electrical systems
• Direct replacement for compatible Siemens ED-frame breakers
• Applications requiring a 125 Amp, 2-pole breaker with 18kAIC
• Installations using load-side lug connections
• Projects where maintaining original equipment compatibility is essential