ED42B125L - 125Amp Circuit Braker

ED42B125L - 125Amp Circuit Braker

Need a reliable circuit breaker that fits right into your existing setup without the hassle? The Siemens ED42B125L is designed to do exactly that. This 125 Amp, 2-pole molded case circuit breaker delivers dependable overcurrent protection while making upgrades or replacements simple and stress-free. As part of the trusted Siemens Sentron ED frame family, it’s built as a form, fit, and functional replacement—so you can keep your system running smoothly with minimal downtime.

What makes this breaker stand out? It combines proven performance with practical design. The thermal magnetic trip unit responds intelligently—handling overloads with inverse-time protection and reacting instantly to short circuits. With a 480V AC rating and 18kA interrupting capacity (18kAIC), it’s ready to protect your equipment in demanding commercial and industrial environments.

Key Features and Benefits

• Trusted Siemens Sentron ED frame molded case circuit breaker
• 125 Amp continuous current rating for reliable performance
• 2-pole design ideal for 480V AC systems
• Thermal magnetic trip unit for both overload and short-circuit protection
• 18kA interrupting capacity (18kAIC) at 480V AC
• Comes factory-equipped with line and load side lugs (TA1E6125)
• Supports 3–3/0 AWG copper or 1–2/0 AWG aluminum wiring
• Designed for standard 40°C operating environments
• Easy form, fit, and functional replacement for Siemens ED-frame equipment
• Built to last in demanding commercial and industrial applications
  

Technical Specifications

• Catalog Number: ED42B125L
  
• 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: Line and Load Side Lugs (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: 2.712 lb.
  
• Product Family: ED4 18kAIC, 480VAC
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Siemens ED42B125L is built to meet UL 489 and IEC 60947-2 standards, giving you confidence that it aligns with recognized industry requirements. It also complies with WEEE (2012/19/EU) take-back obligations where applicable and includes REACH Article 33 material transparency information. For safety and compliance, installation should always be performed by qualified electrical professionals following NEC and local codes.

Where It Works Best

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