JB3125 - 125Amp Circuit Breaker

JB3125 - 125Amp Circuit Breaker

With older electrical equipment, getting the amperage right is only part of finding the correct replacement. The physical size, pole count, trip setup, terminals, and interrupting ratings all need to line up as well. The JB3125 is a 125A, 3-pole Type JB circuit breaker with a thermal-magnetic, non-interchangeable trip unit. The case measures 4.13 inches wide, 10.00 inches long, and 4.13 inches deep, which gives you another useful reference when checking an existing installation. For legacy systems that specifically require these characteristics, the JB3125 can provide the necessary form, fit, and function without making claims unsupported by the specifications.

Key Features and Benefits

• 125A, 3-pole configuration for systems requiring these exact electrical characteristics.
• Type JB construction provides an important reference when identifying a compatible legacy replacement.
• Thermal-magnetic operation with a non-interchangeable trip unit.
• Load-side terminals are included, so this detail is known before installation planning begins.
  

Technical Specifications

• Part Number: JB3125
  
• Type: JB
  
• Amperage: 125 A
  
• Poles: 3
  
• A.I.C. at 600VAC: 14k
  
• A.I.C. at 480VAC: 22k
  
• A.I.C. at 240VAC: 25k
  
• Interrupting Capacity at 600VAC: 14,000 A
  
• Interrupting Capacity at 480VAC: 22,000 A
  
• Interrupting Capacity at 240VAC: 25,000 A
  
• Operation: Thermal-Magnetic
  
• Trip Unit: Non-Interchangeable
  
• Temperature Rating: 40°C
  
• Terminals: Load-Side Terminals Included
  
• Width: 4.13 in.
  
• Height / Length: 10.00 in.
  
• Depth: 4.13 in.
  
• 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 certification or material compliance information was provided for the JB3125. Those credentials should therefore not be assumed from the Type JB designation or the electrical ratings listed above.

Where It Works Best

The JB3125 belongs on the shortlist when you're working with compatible existing or legacy equipment that calls for a 125A, 3-pole Type JB circuit breaker with the same electrical and physical characteristics. The included load-side terminals are especially worth noting, since terminal setup is one of the details that can separate an appropriate replacement from a part that looks similar.