KA3125 - 125Amp Circuit Breaker

KA3125 - 125Amp Circuit Breaker

Need a 125A Type KA circuit breaker for equipment that's already in service? The KA3125 has several identifying details that make it easier to check against the breaker you're replacing. It's a three-pole, thermal-magnetic circuit breaker with an interchangeable trip unit, rated for operation at 40°C. The KA3125 is built to last, but replacement selection should still come down to the details—form, fit, electrical ratings, trip arrangement, and connection requirements. If those specifications line up with your existing Type KA installation, you'll know you're looking at the right configuration.

Key Features and Benefits

• 125A, three-pole rating for equipment requiring this exact electrical configuration.
• Type KA identification gives you an important compatibility point when checking an existing or legacy installation.
• Thermal-magnetic trip design matches systems specifically configured for this type of circuit protection.
• Interchangeable trip unit allows the trip-unit configuration to be identified separately as part of the breaker assembly.
• 40°C rated, an important detail when matching the original breaker specification.
• Load-side terminals included with this configuration.
  

Technical Specifications

• Part Number: KA3125
  
• Product Type: Circuit Breaker
  
• Type: KA
  
• Amperage: 125A
  
• Poles: 3
  
• Trip Type: Thermal-Magnetic
  
• Trip Unit: Interchangeable
  
• Temperature Rating: 40°C
  
• A.I.C. Rating at 240VAC: 25 kA
  
• A.I.C. Rating at 480VAC: 22 kA
  
• A.I.C. Rating at 600VAC: 22 kA
  
• Load-Side Terminals: Included
  
• Width: 5.50 in.
  
• Height / Length: 10.13 in.
  
• Depth: 3.94 in.
  
• Overall Dimensions: 5.50" W × 10.13" L × 3.94 "D
  
• Approximate Ship Weight: 16.00 lb.
  

Material Compliance and Certifications

No specific UL, CSA, IEC, RoHS, REACH, or other certification or material compliance information was provided in the available KA3125 specifications. These certifications should not be assumed. If your installation requires a particular approval or compliance standard, confirm it against the applicable product documentation before installation.

Where It Works Best

The KA3125 125A 3-pole circuit breaker is a practical choice for compatible existing and legacy equipment that specifically calls for a Type KA, thermal-magnetic breaker with an interchangeable trip unit. It is particularly useful when maintaining an established system where the correct breaker type, electrical ratings, dimensions, and connection arrangement are the priority.

Before installation, compare the KA3125 directly with the breaker being replaced. Check the 125A rating, three-pole configuration, Type KA designation, interrupting ratings, 40°C rating, interchangeable trip unit, load-side terminals, and physical dimensions. That specification-by-specification check is the best way to confirm form, fit, and functional compatibility.