J3125 - 125Amp Circuit Breaker

J3125 - 125Amp Circuit Breaker

Replacing a circuit breaker is rarely as simple as matching the amp rating. With the J3125, you're looking at a 125A, 3-pole J-frame circuit breaker with a thermal-magnetic, non-interchangeable trip unit. For older electrical systems where the correct frame, trip configuration, ratings, and dimensions all matter, those details make the J3125 easier to evaluate as a form, fit, and functional replacement. It's built to last, while proper selection still depends on matching the complete breaker specification to the equipment.

Key Features and Benefits

• 125A, 3-pole configuration: Straightforward ratings for comparison with the breaker being replaced.
• J-frame construction: Helps narrow the replacement search when existing equipment requires a Type J or J-frame breaker.
• Thermal-magnetic operation: Uses the thermal-magnetic trip design specified for this model.
• Non-interchangeable trip unit: An important configuration detail when checking compatibility with an existing installation.
• Load-side terminals included: No guesswork about whether the supplied configuration includes load-side terminals.
• 40°C rated: Another specific characteristic that can be checked against equipment requirements.
  

Technical Specifications

• Part Number: J3125
  
• Type: J
  
• Frame: J-Frame
  
• Breaker Type: Thermal-Magnetic Circuit Breaker
  
• Amperage: 125 A
  
• Poles: 3
  
• Voltage: 480 VAC at stated AIC rating
  
• A.I.C. Rating: 14k at 480 VAC
  
• Interrupting Capacity: 14,000 A at 480 VAC
  
• Trip Unit: Non-Interchangeable
  
• Trip Operation: Thermal-Magnetic
  
• Temperature Rating: 40°C
  
• Load-Side Terminals: Included
  
• Width: 8.25 in.
  
• Length: 10.13 in.
  
• Depth: 4.00 in.
  
• Dimensions: 8.25"W x 10.13"L x 4.00"D
  
• Approximate Ship Weight: 23.00 lb.
  

Material Compliance and Certifications

The available specifications do not provide specific UL, CSA, RoHS, REACH, IEC, or other material compliance or certification information for the J3125. Rather than assume a certification based on the frame or breaker type, any required listing or compliance status should be confirmed from the breaker markings or applicable manufacturer documentation.

Where It Works Best

The J3125 makes sense when servicing compatible existing or legacy equipment that calls for a 125A, 3-pole Type J/J-frame thermal-magnetic circuit breaker with a non-interchangeable trip unit. Its 14k AIC rating at 480VAC, load-side terminals, temperature rating, and physical footprint should all be checked as part of the replacement process.