JB3100W - 100Amp Circuit Breaker

JB3100W - 100Amp Circuit Breaker

When you're replacing a breaker in older electrical equipment, the 100-amp rating is only part of the story. Pole count, trip style, interrupting capacity, physical size, and terminal setup all need to line up. The JB3100W is a 100A, 3-pole Type JB circuit breaker with thermal-magnetic operation, a non-interchangeable trip unit, and a 40°C rating. For existing and legacy equipment that calls for this exact Type JB setup, it can serve as a form, fit, and functional replacement when all specifications match. These products are built to last, but proper selection still comes down to confirming the installation's complete electrical and physical requirements.

Key Features and Benefits

• 100A, 3-pole configuration: Matches applications specifically calling for a 100-amp, three-pole Type JB breaker.
• Type JB: A key identifier when checking compatibility with existing or legacy electrical equipment.
• Thermal-magnetic operation: Uses the stated thermal-magnetic trip method.
• Non-interchangeable trip unit: The trip configuration is fixed to this breaker and should be checked against the original unit.
• No terminals supplied: This JB3100W is provided without terminals, so the terminal arrangement must be addressed separately.
  

Technical Specifications

• Part Number: JB3100W
  
• Type: JB
  
• Amperage: 100 A
  
• Poles: 3
  
• A.I.C. Rating at 600VAC: 14k
  
• A.I.C. Rating at 480VAC: 22k
  
• A.I.C. Rating at 240VAC: 25k
  
• Interrupting Capacity at 600VAC: 14,000 A
  
• Interrupting Capacity at 480VAC: 22,000 A
  
• Interrupting Capacity at 240VAC: 25,000 A
  
• Operation: Thermal Magnetic
  
• Trip Unit: Non-Interchangeable
  
• Temperature Rating: 40°C
  
• Terminals: Not Included
  
• Width: 4.13 in.
  
• Height / Length: 10.00 in.
  
• Depth: 4.13 in.
  
• Overall Dimensions: 4.13"W x 10.00"L x 4.13"D
  
• Approximate Ship Weight: 14.00 lb.
  

Material Compliance and Certifications

Specific UL, CSA, IEC, RoHS, REACH, or other certification and material-compliance information was not included in the supplied specifications for the JB3100W. These certifications should not be assumed from the breaker type or electrical ratings.

Where It Works Best

The JB3100W is intended for compatible existing and legacy equipment that calls for a 100A, 3-pole Type JB thermal-magnetic circuit breaker with a non-interchangeable trip unit. When replacing an existing breaker, check the applicable AIC rating, dimensions, and 40°C rating—not just the amperage.

Also keep the terminal setup in mind. No terminals are included with the JB3100W. Before installation, compare the complete specifications with the original breaker and equipment requirements, including part number, Type JB, amperage, pole count, voltage and AIC rating, trip unit, dimensions, and required terminals. That full check helps determine whether the JB3100W is the correct form, fit, and functional replacement.