HEB3B125B - 125Amp Circuit Breaker

HEB3B125B - 125Amp Circuit Breaker

The Siemens HEB3B125B is a 125 Amp, three-pole thermal magnetic circuit breaker designed for your Siemens low voltage panelboard applications using an EG frame breaker. This model is commonly used when replacing an existing breaker where maintaining the original panel configuration, electrical ratings, and installation requirements matters. It provides the same form, fit, and functional characteristics needed for compatible replacement applications without changing the way the existing system is set up.

Key Features and Benefits

• 125 Amp three-pole circuit breaker for Siemens EG frame applications
• Thermal magnetic trip protection for overload and short-circuit conditions
• Rated for 480V electrical systems
• Load side lugs included
• Accepts #8–1/0 AWG copper or aluminum conductors
• UL Listed HEB frame design
• Panelboard mounting configuration
• Suitable for compatible replacement and maintenance applications
• Helps maintain existing panelboard layout and specifications

Technical Specifications

• Catalog Number: HEB3B125B
  
• Product Type: Thermal magnetic circuit breaker
  
• Frame Type: EG Frame
  
• Amperage Rating: 125 Amps
  
• Voltage Rating: 480V
  
• Poles: 3
  
• Trip Unit: Thermal magnetic
  
• Interrupt Rating: 65kAIC at 480V
  
• Interrupt Rating: 25kAIC at 600Y/347V
  
• Mounting Type: Panelboard mount
  
• Terminal Configuration: Load side lugs only
  
• Wire Range: #8–1/0 AWG CU/AL
  
• Dimensions: 3 in W x 5.5 in H x 3 in D
  
• Weight: 2.513 lb
  
• UPC: 783643559097
  

Material Compliance and Certifications

The Siemens HEB3B125B is a UL Listed HEB frame circuit breaker intended for use in compatible Siemens low voltage panelboard systems. It is designed for replacement and maintenance work where matching the existing breaker specifications is important. Installation should be completed by qualified electrical professionals and must follow applicable electrical codes, safety practices, and manufacturer requirements.

Where It Works Best

• Siemens low voltage panelboards requiring an EG frame breaker
• Three-phase distribution systems using 125 Amp protection
• 480V commercial and industrial electrical applications
• Replacement of compatible Siemens HEB series breakers
• Electrical maintenance projects involving existing panelboard equipment
• Applications requiring thermal magnetic circuit protection