HED42B125L - 125Amp Circuit Breaker

HED42B125L - 125Amp Circuit Breaker

The Siemens HED42B125L is a 125 Amp, 2-pole ED frame molded case circuit breaker built for compatible Siemens SENTRON electrical distribution equipment. When you're replacing a breaker in an existing system, the small details matter. Matching the correct frame style, amperage, voltage rating, pole configuration, and lug arrangement helps ensure the replacement fits the original application. The HED42B125L provides those key specifications, including a 480V rating, 42kAIC interrupting capacity, and line and load side lug connections.

Key Features and Benefits

• 125 Amp, 2-pole Siemens ED frame circuit breaker
• Thermal magnetic trip unit for overload and short-circuit protection
• 480V circuit breaker rating
• 42kAIC interrupting rating at 480V
• Line and load side lug connections
• Accepts:
  • 3–3/0 AWG copper conductors
  • 1–2/0 AWG aluminum conductors
• Siemens SENTRON molded case breaker design
• Meets UL 489 and IEC 60947-2 standards
• Standard 40°C breaker frame rating
• Suitable for compatible breaker replacement and maintenance applications

Technical Specifications

• Catalog Number: HED42B125L
  
• Product Type: Molded Case Circuit Breaker
  
• Frame Type: ED Frame
  
• Amp Rating: 125 Amps
  
• Voltage Rating: 480V
  
• Poles: 2
  
• Trip Unit: Thermal Magnetic
  
• Interrupting Rating: 42kAIC at 480V
  
• Terminal Configuration: Line and load side lugs
  
• Copper Wire Range: 3–3/0 AWG
  
• Aluminum Wire Range: 1–2/0 AWG
  
• Dimensions: 2 in W x 6.35 in H x 3.92 in D
  
• Net Weight: 2.712 lb
  
• UPC: 783643090279
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Siemens HED42B125L is a low-voltage molded case circuit breaker designed to meet UL 489 and IEC 60947-2 standards. It is intended for use in compatible Siemens electrical distribution equipment where the breaker specifications match the existing installation.

Before installation, verify that the breaker matches the equipment requirements, including frame style, voltage rating, amp rating, pole configuration, terminal connections, and conductor sizing.

Where It Works Best

• Siemens ED frame electrical distribution equipment
• 480V two-pole circuit applications
• Commercial and industrial electrical systems
• Maintenance and replacement projects requiring a matching 125 Amp breaker
• Applications using copper or aluminum conductors within the listed range
• Existing installations where maintaining the original breaker configuration is important