ED42B040 - 40Amp Circuit Breaker

ED42B040 - 40Amp Circuit Breaker

Need a reliable circuit breaker that fits seamlessly into your existing setup? The Siemens ED42B040 is a 40 Amp, 2-pole molded case circuit breaker designed specifically for use in compatible Siemens ED-frame panelboards and distribution systems. Whether you're replacing a worn-out breaker or performing routine maintenance, this model helps you keep your system running smoothly—without the hassle of modifying your panel.

Installation is straightforward thanks to load-side lug terminals (LN1E100) that accept 10–1/0 AWG copper or aluminum conductors, giving you flexibility when working with existing wiring. Built to meet industry standards and designed for long-term use, the Siemens ED42B040 is a practical solution for maintaining your ED-frame electrical system.

Key Features and Benefits

• 40 Amp, 2-pole Siemens ED frame molded case circuit breaker
• Thermal magnetic trip unit for reliable overload and short-circuit protection
• Rated for 480V AC commercial and industrial applications
• 18kA interrupting capacity (18kAIC) at 480V AC
• Load-side lug terminals (LN1E100) for easy, compatible installation
• Accepts 10–1/0 AWG copper or aluminum conductors
• Designed for use with compatible Siemens ED-frame equipment
• Helps maintain original panel configuration during replacement
• Form, fit, and functional replacement for compatible systems
• Built for dependable performance in properly matched applications
  

Technical Specifications

• Catalog Number: ED42B040
  
• Manufacturer: Siemens
  
• Product Type: Molded Case Circuit Breaker
  
• Frame Type: ED
  
• Trip Unit: Thermal Magnetic
  
• Amperage Rating: 40 Amps
  
• Voltage Rating: 480V AC
  
• Poles: 2
  
• Interrupt Rating: 18 kAIC at 480V AC
  
• Terminal Type: Load Lug Terminals (LN1E100)
  
• Wire Range: 10–1/0 AWG Copper / Aluminum
  
• Operating Temperature Reference: Standard 40°C Breaker
  
• Dimensions: 2.00 in. W × 6.35 in. H × 3.92 in. D
  
• Weight: 0.179 lb
  
• Product Family: ED4 18kAIC, 480VAC
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• The Siemens ED42B040 meets UL 489 and IEC 60947-2 standards for molded case circuit breakers, helping ensure it aligns with recognized electrical safety requirements. It is RoHS compliant (since July 1, 2006), subject to WEEE (2012/19/EU) take-back obligations where applicable, and Siemens provides REACH Article 33 information for material transparency.
• For safety and compliance, installation should always be performed by qualified electrical professionals following the National Electrical Code (NEC) and local regulations.
  

Where It Works Best

• Siemens ED-frame panelboards and distribution equipment
• Commercial electrical distribution systems
• Industrial power distribution panels
• 480V AC branch circuit protection
• Replacement of existing compatible Siemens ED-frame breakers
• Maintenance and repair of installed electrical systems
• Applications requiring a 40 Amp, 2-pole molded case circuit breaker
• Projects where maintaining original equipment compatibility is important