JB3125W - 125Amp Circuit Breaker

JB3125W - 125Amp Circuit Breaker

When you're replacing a breaker in older electrical equipment, the small details matter. A 125-amp rating alone isn't enough—the pole count, Type designation, trip unit, interrupting ratings, physical size, and terminal setup must all match the existing installation. One point to catch before installation: this version does not include terminals, so terminal requirements need to be checked separately. For compatible legacy equipment calling for these exact characteristics, the JB3125W offers the form, fit, and functional specifications needed for replacement work.

Key Features and Benefits

• 125A, 3-pole design matches equipment requiring this specific amperage and pole arrangement.
• Type JB designation helps narrow down compatibility when replacing a breaker in existing or legacy equipment.
• Thermal-magnetic operation provides the trip configuration specified for this breaker.
• Uses a non-interchangeable trip unit, an important detail to verify when matching an existing installation.
• 40°C rated for applications requiring this temperature rating.
• No terminals are included, allowing this requirement to be identified before installation.
  

Technical Specifications

• Part Number: JB3125W
  
• Type: JB
  
• Amperage: 125 A
  
• Poles: 3
  
• A.I.C. Rating at 600VAC: 14k
  
• A.I.C. Rating at 480VAC: 22k
  
• A.I.C. Rating at 240VAC: 25k
  
• Interrupting Capacity at 600VAC: 14,000 A
  
• Interrupting Capacity at 480VAC: 22,000 A
  
• Interrupting Capacity at 240VAC: 25,000 A
  
• Trip Type: Thermal Magnetic
  
• Trip Unit: Non-Interchangeable
  
• Temperature Rating: 40°C
  
• Terminals: Not Included
  
• Width: 4.13 in.
  
• Height / Length: 10.00 in.
  
• Depth: 4.13 in.
  
• Overall Dimensions: 4.13"W x 10.00"L x 4.13"D
  
• Approximate Ship Weight: 14.00 lb.
  

Material Compliance and Certifications

No specific UL, CSA, IEC, RoHS, REACH, or other material-compliance or certification information was provided in the available specifications for the JB3125W. These certifications should not be assumed based on the Type JB designation, amperage, voltage, or interrupting ratings.

Where It Works Best

The JB3125W 125A 3-pole circuit breaker is intended for compatible existing and legacy electrical equipment that specifically calls for a Type JB breaker with the same electrical ratings, dimensions, and trip arrangement. Because the JB3125W does not include terminals, terminal compatibility warrants particular attention when verifying that it is the correct replacement.