JJ3B400 - 400Amp Circuit Breaker

JJ3B400 - 400Amp Circuit Breaker

For the JJ3B400, the 400A rating aligns directly with its Type ET, 400 Ampere “JJ” Frame identification, providing a useful nameplate detail to check when you're replacing a breaker in existing equipment. The JJ3B400 is built to last and is well suited to form, fit, and functional replacement work where the JJ3 frame, pole count, dimensions, temperature rating, voltage, and interrupting capacity correspond with the requirements of the equipment already in service.

Key Features and Benefits

• 400A, three-pole configuration provides clear electrical identification for replacement checks.
• The JJ3 frame helps confirm compatibility with equipment that requires this specific frame type.
• Type ET, 400 Ampere “JJ” Frame designation provides another useful reference when comparing the existing breaker.
• 40°C, rated per the available product specifications.
  

Technical Specifications

• Part Number: JJ3B400
  
• Product Type: Molded Case Circuit Breaker
  
• Frame Type: JJ3
  
• Type: ET
  
• Frame Identification: 400 Ampere “JJ” Frame
  
• Rated Current: 400A
  
• Number of Poles: 3
  
• AIC at 240VAC: 42 kA
  
• AIC at 480VAC: 30 kA
  
• AIC at 600VAC: 22 kA
  
• Temperature Rating: 40°C
  
• Width: 9.00 in.
  
• Height / Length: 11.00 in.
  
• Depth: 4.00 in.
  
• Overall Dimensions: 9.00 in. W × 11.00 in. L × 4.00 in. D
  
• Approximate Ship Weight: 22.00 lb.
  

Material Compliance and Certifications

No UL, CSA, IEC, RoHS, REACH, or other certification or material-compliance information was included in the specifications provided for the JJ3B400. These approvals should not be assumed based on the JJ3 frame or the Type ET designation alone. If a particular certification is required for the installation, verify it against the breaker labeling and applicable product documentation.

Where It Works Best

The JJ3B400 is best suited for compatible existing and legacy electrical equipment that requires a 400A, three-pole molded-case circuit breaker with JJ3 frame characteristics. Its Type ET identification, physical dimensions, and voltage-specific AIC ratings provide several useful checkpoints when evaluating a form, fit, and functional replacement.