ED43B040 - 40Amp Circuit Breaker

ED43B040 - 40Amp Circuit Breaker

Keeping an electrical distribution system operating safely often comes down to using the correct replacement breaker. The Siemens ED43B040 is a 40 Amp, 3-pole molded case circuit breaker designed for dependable circuit protection in compatible commercial and industrial power systems. As part of the trusted Siemens Sentron ED frame family, this breaker features a thermal magnetic trip unit that helps protect connected equipment from overloads and short circuits while maintaining the original form, fit, and function of your existing installation. Rated for 480V AC with an 18kA interrupting capacity (18kAIC), the ED43B040 is well suited for applications requiring reliable overcurrent protection in three-phase systems.

Whether you're replacing an existing Siemens ED-frame breaker during routine maintenance or keeping critical spare parts on hand, the ED43B040 delivers the compatibility and ratings your system was designed around. Built to last, it provides dependable protection for properly matched electrical applications.

Key Features and Benefits

• Siemens Sentron ED frame molded case circuit breaker
• 40 Amp continuous current rating
• Three-pole configuration for three-phase electrical systems
• Thermal magnetic trip unit provides overload and instantaneous short-circuit protection
• Rated for 480V AC applications
• 18kA interrupting capacity (18kAIC) at 480V AC
• Load-side lugs only (LN1E100)
• Accommodates 10 AWG to 1/0 AWG copper or aluminum conductors
• Designed for standard 40°C ambient operating conditions
• Built to last for long-term service in compatible electrical distribution systems
• Form, fit, and functional replacement for compatible Siemens ED-frame circuit breakers
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: ED43B040
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Sentron ED Frame (ED4)
  
• Trip Unit: Thermal Magnetic
  
• Current Rating: 40 Amps
  
• Voltage Rating: 480V AC
  
• Number of Poles: 3
  
• Interrupting Rating: 18kAIC at 480V AC
  
• Terminal Type: Load Lugs Only (LN1E100)
  
• Wire Range: 10 AWG to 1/0 AWG Copper/Aluminum
  
• Ambient Temperature Rating: 40°C (104°F)
  
• Dimensions:
  • Width: 3.00 in.
  • Height: 6.35 in.
  • Depth: 3.92 in.
• Weight: 3.668 lbs.
  
• Country of Origin: Mexico
  
• Product Family: ED4 18kAIC, 480VAC

Material Compliance and Certifications

The Siemens ED43B040 is manufactured to meet UL 489 and IEC 60947-2 standards for molded case circuit breakers, supporting recognized safety and performance requirements for low-voltage power distribution. It also complies with RoHS substance restriction requirements (since October 10, 2008) and supports WEEE (2012/19/EU) take-back obligations where applicable. Installation should always be completed by qualified personnel in accordance with the National Electrical Code (NEC) and all applicable local electrical codes.

Where It Works Best

• Commercial buildings
• Industrial facilities
• Manufacturing plants
• Panelboards
• Switchboards
• Three-phase 480V AC electrical systems
• OEM equipment requiring a 40 Amp, 3-pole molded case circuit breaker
• Maintenance and repair of compatible Siemens ED-frame installations
• Electrical systems requiring load-side lug connections and thermal magnetic circuit protection