NB3800 - 700 Amp Circuit Breaker

NB3800 - 700 Amp Circuit Breaker

When you’re replacing a circuit breaker in existing electrical equipment, getting the specifications right matters. The NB3800 circuit breaker is an 800-amp, 3-pole thermal-magnetic circuit breaker designed for compatible electrical distribution equipment that uses an NB-type breaker and an interchangeable trip unit. The NB3800 is 40°C rated and has clearly defined interrupting ratings for several common AC system voltages: 22 kA at 600 VAC, 30 kA at 480 VAC, and 42 kA at 240 VAC. It measures 16 inches high, 8.25 inches wide, and 5.5 inches deep, giving maintenance teams the information they need to check physical fit before installation. Load-side terminals are included as well. For electricians, facility managers, and maintenance teams working with compatible legacy electrical systems, the NB3800 can provide the form, fit, and function needed to replace an existing breaker with matching specifications. Its thermal magnetic design and interchangeable trip unit support the configuration found in equipment designed around this NB-type breaker. When properly selected, installed, and maintained within their specified ratings, these products are built to last.

Key Features and Benefits

• 800 amp, 3-pole configuration for compatible three-phase electrical systems.
• Thermal-magnetic operation provides both thermal and magnetic trip functions.
• Interchangeable trip unit matches equipment designed around this breaker configuration.
• Multiple A.I.C. ratings — 22 kA at 600 VAC, 30 kA at 480 VAC, and 42 kA at 240 VAC.
• 40°C rated for applications within the breaker’s specified temperature rating.
• Load-side terminals included for the specified load connection.
• NB-type construction helps maintenance professionals match the required breaker type when replacing an existing unit.
• Clearly defined dimensions make it easier to check physical compatibility before installation.

Technical Specifications

• Part Number: NB3800
  
• Type: NB
  
• Amperage: 800 A
  
• Number of Poles: 3
  
• Breaker Type: Thermal Magnetic
  
• Trip Unit: Interchangeable
  
• Temperature Rating: 40°C
  
• A.I.C. Rating at 600 VAC: 22 kA
  
• A.I.C. Rating at 480 VAC: 30 kA
  
• A.I.C. Rating at 240 VAC: 42 kA
  
• Height: 16.0 in.
  
• Width: 8.25 in.
  
• Depth: 5.5 in.
  
• Load-Side Terminals: Included
  

Material Compliance and Certifications

• The available product specifications did not include specific material compliance declarations, agency listings, or certification information. Do not assume these details based on the NB3800 part number or electrical ratings alone.
• Before installation, check the breaker’s labeling and available documentation to confirm its ratings and any required certifications match the equipment, application, and applicable electrical codes.

Where It Works Best

• The NB3800 800 amp circuit breaker is intended for compatible existing and legacy electrical distribution equipment requiring an NB-type, 3-pole thermal magnetic circuit breaker with matching electrical and physical specifications.
• It is particularly relevant when maintaining equipment where matching the existing breaker’s form, fit, function, amperage, voltage, interrupting rating, trip configuration, dimensions, and terminal requirements is important.
• Before installing an NB3800 as a replacement breaker, verify the equipment requirements rather than relying on the part number alone. Qualified electrical personnel should confirm system voltage, A.I.C. requirements, amperage, trip characteristics, physical fit, connections, and equipment compatibility.