ED43B045 - 45Amp Circuit Breaker

ED43B045 - 45Amp Circuit Breaker

Finding the right replacement breaker shouldn't be a guessing game. If your electrical system calls for the Siemens ED43B045, this 45 Amp, 3-pole molded case circuit breaker is designed to provide the ratings and compatibility your existing installation requires. Built for 480V AC three-phase systems, it combines a thermal magnetic trip unit with an 18kA interrupting capacity (18kAIC) to help protect electrical equipment from overloads and short circuits. Its factory-installed load lugs (LN1E100) accept 10 AWG to 1/0 AWG copper or aluminum conductors, making installation straightforward in compatible equipment. Whether you're replacing a breaker during scheduled maintenance or restoring an existing distribution system, maintaining the original design is important.

Key Features and Benefits

• Siemens Sentron ED frame molded case circuit breaker
• 45 Amp continuous current rating
• Three-pole configuration for three-phase electrical systems
• Thermal magnetic trip unit provides overload and short-circuit protection
• Rated for 480V AC applications
• 18kA interrupting capacity (18kAIC) at 480V AC
• Factory-installed load lugs (LN1E100)
• Accepts 10 AWG to 1/0 AWG copper or aluminum conductors
• Designed for operation in standard 40°C (104°F) ambient environments
• Built to last for long-term service in compatible electrical systems
• Designed to maintain the original form, fit, and function of compatible Siemens ED frame installations
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: ED43B045
  
• Manufacturer Part Number (MFN): ED43B045
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Sentron ED Frame (ED4)
  
• Trip Unit: Thermal Magnetic
  
• Current Rating: 45 Amps
  
• Voltage Rating: 480V AC
  
• Poles: 3
  
• Interrupting Capacity: 18kAIC @ 480V AC
  
• Terminal Type: Load Lugs (LN1E100)
  
• Wire Range: 10 AWG to 1/0 AWG Copper/Aluminum
  
• Ambient Temperature Rating: 40°C (104°F)
  
• Dimensions:
  • Width: 3.00 inches
  • Length: 6.35 inches
  • Depth: 3.92 inches
• Net Weight: 3.869 lbs.
  
• Country of Origin: Mexico

Material Compliance and Certifications

The Siemens ED43B045 is manufactured to comply with UL 489 and IEC 60947-2 standards for molded case circuit breakers, helping ensure it meets established safety and performance requirements. It is RoHS compliant (since July 1, 2006) and supports WEEE (2012/19/EU) take-back obligations where applicable. Installation should always be performed by qualified personnel in accordance with the National Electrical Code (NEC), manufacturer recommendations, and all applicable local electrical codes.

Where It Works Best

• Commercial office buildings
• Manufacturing facilities
• Industrial plants
• Power distribution panels
• Switchboards
• Motor control equipment
• OEM machinery
• Facility maintenance and repair projects
• Existing Siemens ED frame electrical systems requiring a 45 Amp, 3-pole thermal magnetic circuit breaker
• Applications where preserving the original form, fit, and function of the electrical system is essential