JT3125T - 125Amp Trip Unit

JT3125T - 125Amp Trip Unit

If you're replacing a trip unit in an existing Series C breaker assembly, the JT3125T has several identifiers to check before installation. At 1.3 lb, it's a relatively small component, but getting the exact configuration right is important. The JT3125T is built to last and is UL Listed, making it a practical choice when the existing breaker assembly specifically calls for this Series C trip-unit configuration.

Key Features and Benefits

• 125A rating for assemblies that call for this specific amperage.
• Three-pole design matches compatible three-pole breaker configurations.
• Uses thermal-magnetic trip technology.
• T185 trip type provides a specific identifier when checking an existing unit.
• Made for JT circuit breaker type with a J-K frame size.
• Part of the Series C product line.
• UL Listed according to the manufacturer.
  

Technical Specifications

• Catalog Number: JT3125T
  
• Manufacturer: Eaton
  
• Product: Molded Case Circuit Breaker Accessory Trip Unit
  
• Series: Series C
  
• Type: Trip Unit
  
• Amperage Rating: 125A
  
• Poles: 3
  
• Trip Type: T185
  
• Trip Technology: Thermal-Magnetic
  
• Circuit Breaker Type: JT
  
• Frame Size: J-K
  
• Width: 4.2 in.
  
• Height: 5.3 in.
  
• Length / Depth: 7.0 in.
  
• Product Weight: 1.3 lb
  
• UPC: 786679404126
  

Material Compliance and Certifications

The JT3125T is UL Listed. The supplied product information directs customers to contact the manufacturer for additional compliance details. No other material or environmental certifications were provided, so they should not be assumed.

Where It Works Best

The JT3125T belongs in compatible molded-case circuit breaker assemblies that require a 125A, three-pole T185 thermal-magnetic trip unit for a JT breaker type and J-K frame size. That makes it particularly useful for maintaining existing or legacy equipment, where the replacement needs to remain consistent with the original breaker setup.

Before installing it, compare the catalog number, 125A rating, three-pole layout, T185 trip type, JT breaker type, J-K frame size, and dimensions with those of the existing assembly. It's a simple check, but an important one when form, fit, and function all need to line up.