JL3B125 - 125Amp Circuit Breaker

JL3B125 - 125Amp Circuit Breaker

The JL3B125 gives you a handful of clear specifications to check when sourcing a breaker for existing electrical equipment. It is rated at 125 amps with three poles and uses a JL3 frame, while the additional identification calls out a Type ET, 400 Ampere “JL” frame molded-case circuit breaker. The JL3B125 is built to last and is suited to form, fit, and functional replacement situations where the existing system specifically calls for its 125A rating, JL3 frame, three-pole arrangement, dimensions, and interrupting capacities.

Key Features and Benefits

• 125A current rating provides a clear reference point when checking an existing breaker.
• Three-pole configuration for equipment requiring this exact pole arrangement.
• JL3 frame helps identify physical and equipment compatibility.
• Type ET, 400 Ampere “JL” Frame identification provides another useful nameplate detail for replacement matching.
• 40°C rated, as stated in the supplied product specifications.
  

Technical Specifications

• Part Number: JL3B125
  
• Product Type: Molded Case Circuit Breaker
  
• Frame Type: JL3
  
• Rated Current: 125A
  
• Number of Poles: 3
  
• AIC Rating at 600VAC: 22 kA
  
• AIC Rating at 480VAC: 30 kA
  
• AIC Rating at 240VAC: 42 kA
  
• Temperature Rating: 40°C
  
• Additional Identification: Type ET, 400 Ampere “JL” Frame
  
• 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 specific UL, CSA, IEC, RoHS, REACH, or other certification or material-compliance information was included in the supplied JL3B125 specifications. Those approvals should not be assumed from the part number, frame designation, or electrical ratings alone. If a particular certification is required for the installation, verify it on the product label or in the applicable manufacturer documentation before use.

Where It Works Best

The JL3B125 is suited to compatible existing and legacy electrical systems that require a 125A, three-pole JL3 frame molded case circuit breaker with the stated physical dimensions and voltage-specific interrupting ratings. For replacement work, the JL3 frame designation, Type ET identification, pole count, amperage, and 9.00 × 11.00 × 4.00-inch footprint provide useful details for narrowing down compatibility.