HFD63B125L - 125Amp Circuit Breaker

HFD63B125L - 125Amp Circuit Breaker

When your existing electrical system calls for a Siemens HFD63B125L, matching the breaker’s specifications matters. The HFD63B125L is a 125-amp, 3-pole SENTRON molded case circuit breaker built around the Siemens FD frame and rated for applications up to 600VAC. It uses a thermal-magnetic trip unit for overload and short-circuit protection and carries an interrupting rating of 25 kAIC at 600V and 65 kAIC at 480V.

Key Features and Benefits

• 125A, 3-pole configuration: Matches electrical equipment designed for a three-pole, 125-amp FD-frame circuit breaker.
• Up to 600VAC: Suitable for compatible systems requiring the breaker’s specified voltage rating.
• Thermal-magnetic trip unit: Provides overload and short-circuit protection through a familiar, straightforward trip design.
• Line and load lugs included: TA1FD350A lugs are provided on both sides of the breaker, an important compatibility detail for the HFD63B125L.
• Copper and aluminum conductor compatibility: Accepts a broad range of specified Cu and Al conductor sizes.
• Recognized standards: Meets UL 489 and IEC 60947-2 requirements.

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number / MFN: HFD63B125L
  
• Product Type: Molded Case Circuit Breaker
  
• Series: SENTRON
  
• Product Family: HFD6
  
• Frame: FD
  
• Rated Current: 125A
  
• Number of Poles: 3
  
• Maximum Voltage: 600VAC
  
• Trip Unit: Thermal-Magnetic
  
• Standard Temperature Rating: 40°C
  
• Interrupting Rating at 600V: 25 kAIC
  
• Interrupting Rating at 480V: 65 kAIC
  
• Lug Type: TA1FD350A
  
• Lug Configuration: Line and Load Side
  
• Copper Conductor Range: 6 AWG–350 kcmil
  
• Aluminum Conductor Range: 4 AWG–350 kcmil
  
• Dimensions (W × H × D):
  • 4.5 × 9.5 × 4 in.
• Net Weight: 10.031 lb
  
• UPC: 783643235885
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Siemens HFD63B125L circuit breaker meets UL 489 and IEC 60947-2 standards, providing useful certification information when confirming the breaker against equipment and application requirements.

Where It Works Best

The HFD63B125L 125A circuit breaker is best suited to commercial and industrial electrical distribution equipment designed for a Siemens SENTRON FD-frame, 3-pole breaker with matching electrical and physical requirements. It is particularly relevant for maintenance, repair, and form-fit-function replacement situations where preserving compatibility with existing equipment is the priority.