JD3125 - 125Amp Circuit Breaker

JD3125 - 125Amp Circuit Breaker

The Eaton JD3125 is a 125-amp, three-pole molded case circuit breaker from the Series C line. For replacement work, the important question is whether the breaker matches the existing equipment's requirements. Here, that means checking the JD breaker type, J-frame, T186 trip type, voltage ratings, terminals, physical size, and amperage. At 4.13 inches wide, 4.13 inches high, and 4.06 inches deep, its published dimensions also give you something concrete to compare against the breaker being replaced. The JD3125 is UL Listed and built to last. When all of these details match the existing installation, it can serve as a form-fit-and-function replacement for compatible equipment.

Key Features and Benefits

• 125A, three-pole configuration for systems that specifically require these ratings.
• Part of the Eaton Series C molded case circuit breaker line.
• JD breaker type with a J frame, giving you two important identifiers to check during replacement.
• Rated for 600VAC and 250VDC.
• Uses the specified T186 trip type.
• Supplied with aluminum line and load terminals.
• 50/60 Hz frequency rating for compatible AC systems.
• UL Listed according to the manufacturer specifications.
  

Technical Specifications

• Catalog Number: JD3125
  
• Manufacturer: Eaton
  
• Series: Series C
  
• Product Type: Molded Case Circuit Breaker
  
• Circuit Breaker Type: JD
  
• Frame: J
  
• Circuit Breaker Frame Type: Complete Breaker
  
• Type: Complete Breaker
  
• Amperage Rating: 125 A
  
• Number of Poles: Three
  
• Voltage Rating: 600 VAC, 250 VDC
  
• Frequency Rating: 50/60 Hz
  
• Trip Type: T186
  
• Interrupt Rating at 240VAC: 65 kAIC
  
• Interrupt Rating at 480VAC: 35 kAIC
  
• Terminals: Line and Load
  
• Terminal Material: Aluminum
  
• Product Width: 4.13 in.
  
• Product Height: 4.13 in.
  
• Product Length / Depth: 4.06 in.
  
• Product Weight: 9.55 lb.
  
• UPC: 786679013540
  
• Certification: UL Listed
  

Material Compliance and Certifications

• The JD3125 is UL Listed, as specified in the manufacturer's specifications.
  

Where It Works Best

The Eaton JD3125 belongs in compatible existing or legacy equipment that specifically calls for its combination of 125A capacity, three poles, JD breaker type, J frame, and T186 trip type. The aluminum line and load terminals, along with the physical dimensions, should also be included in the compatibility check.

Pay particular attention to the electrical ratings. The breaker is rated 600VAC and 250VDC, while the supplied interrupting ratings are 65 kAIC at 240VAC and 35 kAIC at 480VAC. Those values should be checked against the actual system requirements rather than relying on amperage or catalog number alone.