A1B390 - 90 Amp Circuit Breaker

A1B390 - 90 Amp Circuit Breaker

The A1B390 circuit breaker is designed for electrical systems that need dependable 90 amp protection in a compact, bolt-on format. With a 3-pole design and thermal magnetic trip function, it helps protect circuits from overloads and short circuits in many common commercial and industrial applications. Its straightforward bolt-on installation makes it a practical option for service work, panel maintenance, and replacement projects involving compatible A1B-style systems.

This breaker is commonly used in existing panelboards and distribution equipment where matching fit and function matters. Whether you're installing it during scheduled maintenance or replacing an existing unit in the field, the A1B390 is built for consistent day-to-day use in demanding environments.

Key Features and Benefits

• 90 amp, 3-pole circuit breaker
• Bolt-on mounting style for secure installation
• Thermal magnetic trip protection
• 10k A.I.C. rating at 240VAC
• Compact size for compatible panelboards and load centers
• Built for long service life in commercial and industrial systems
• Designed for replacement, maintenance, and repair applications

Technical Specifications

• Part Number: A1B390
  
• Type: A1B
  
• Poles: 3
  
• Amperes: 90A
  
• Voltage Rating: 240VAC
  
• A.I.C. Rating: 10k @ 240VAC
  
• Mounting Style: Bolt-On
  
• Trip Unit: Thermal Magnetic
  
• Dimensions:
  • Width: 2.25" W
  • Height: 6.00" H
  • Depth: 2.31" D
• Width: 2.25"
  
• Height: 6.00"
  
• Depth: 2.31"
  

Material Compliance and Certifications

• The A1B390 is manufactured for use in electrical distribution systems requiring overcurrent protection that aligns with applicable industry standards. Installation should be completed by qualified electrical personnel and according to local electrical codes and equipment specifications.

Where It Works Best

• Commercial electrical distribution systems
• Industrial control and power panels
• Existing bolt-on panelboards and load centers
• Maintenance and replacement projects
• Feeder and branch circuit protection applications
• Facilities operating legacy electrical equipment