ED43B125 - 125Amp Circuit Breaker

ED43B125 - 125 Amp Circuit Breaker

The Siemens ED43B125 is a 3-pole, 125-amp circuit breaker rated for 480V AC. It’s used in commercial and industrial panels where matching the original breaker’s specifications is important. The thermal-magnetic trip unit responds to overloads and short circuits, helping you protect circuits and connected equipment.

Built on the ED frame, this breaker is supplied with load-side lugs only, allowing wiring to be adapted to the installation. Its toggle handle makes manual operation simple, and the compact size (3 × 6.35 × 3.92 inches) fits most standard panel layouts. Rated for 18kA at 480V, the ED43B125 meets UL 489 and IEC 60947-2 standards.

Key Features and Benefits

• 125A, 3-pole molded case breaker: 125A, 3-pole molded case breaker.
• Rated for 480V AC systems: Rated for 480V AC systems.
• Thermal-magnetic trip unit for overload and short-circuit protection: Thermal-magnetic trip unit for overload and short-circuit protection.
• 18kA interrupting capacity at 480V AC: 18kA interrupting capacity at 480V AC.
• ED frame design for standard panel fit: ED frame design for standard panel fit.
• Load-side lugs installed (TA1E6125): Load-side lugs installed (TA1E6125).
• Toggle handle operation: Toggle handle operation.
• Compact size for easy panel integration: Compact size for easy panel integration.
• Suitable for replacement and maintenance in commercial and industrial panels: Suitable for replacement and maintenance in commercial and industrial panels.
  

Technical Specifications

• Catalog Number: ED43B125
  
• Manufacturer Part Number: ED43B125
  
• Poles: 3
  
• Amperage Rating: 125A
  
• Voltage Rating: 480V AC
  
• Interrupting Capacity: 18kA at 480V AC
  
• Trip Unit Type: Thermal-Magnetic
  
• Frame: ED
  
• Lug Configuration: Load-side only
  
• Wire Range: 3–3/0 AWG Copper, 1–2/0 AWG Aluminum
  
• Dimensions:
  • Width: 3 in
  • Height: 6.35 in
  • Depth: 3.92 in
• Weight: 3.79 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 and IEC 60947-2 certified: UL 489 and IEC 60947-2 certified.
• RoHS and WEEE compliant: RoHS and WEEE compliant.
• REACH information available: REACH information available.
• Suitable for commercial and industrial use: Suitable for commercial and industrial use.
  

Where It Works Best

• Commercial distribution panels
• Industrial facilities and manufacturing plants
• Branch and feeder circuit protection
• Maintenance and repair projects
• Retrofit and legacy panel applications
• Systems requiring a 125A, 3-pole ED-frame breaker
• The ED43B125 provides the correct form, fit, and function for replacing or maintaining existing electrical systems. Its standard ratings, ED-frame size, and thermal-magnetic protection make it a practical choice for keeping panels and circuits operational in commercial and industrial settings.