QO390 - 90 Amp Circuit Breaker

QO390 - 90 Amp Circuit Breaker

When you need dependable overcurrent protection for a higher-capacity electrical circuit, the QO390 Plug-On Circuit Breaker is built to get the job done. Rated at 90 amps with a 3-pole configuration, this Type QO circuit breaker is designed for use in compatible load centers and panelboards operating at 240VAC. Whether you're replacing an existing breaker or completing a new installation, the QO390 helps protect your electrical system from overloads and short circuits while keeping power flowing where it's needed. Its convenient plug-on design makes installation straightforward in compatible equipment, saving time during maintenance or upgrades. With a 10kA interrupting rating, the QO390 is engineered to safely interrupt fault currents, helping protect wiring, connected equipment, and your electrical distribution system. From commercial facilities to residential applications requiring three-pole protection, this breaker offers the performance electricians and maintenance professionals rely on every day.

Key Features and Benefits

• 90 Amp Rating: 90 Amp rating for higher-capacity branch circuit protection.
• 3-Pole Design: 3-pole design for compatible three-phase electrical systems.
• Plug-On Installation: Plug-on installation simplifies replacement and new installations.
• 10kA AIC Rating: 10kA AIC rating at 240VAC helps interrupt fault currents safely.
• Circuit Protection: Helps protect electrical equipment from overloads and short circuits.
• Compact Design: Compact design fits compatible load centers and panelboards.
• Ideal for Maintenance and Expansion: Ideal for maintenance, repairs, renovations, and system expansions.
  

Technical Specifications

• Part Number: QO390
  
• Type: QO
  
• Mounting Style: Plug-On
  
• Poles: 3
  
• Amperage: 90 Amps
  
• Voltage Rating: 240VAC
  
• Interrupting Rating: 10kA AIC
  
• Dimensions:
  • Height: 3.5 in.
  • Width: 2.25 in.
  • Depth: 2.5 in.

Material Compliance and Certifications

• Compatible Systems: Manufactured for use in compatible Type QO electrical distribution systems.
• Industry Standards: Designed to meet applicable industry standards for molded case circuit breakers.
• Installation Requirements: Install in accordance with the National Electrical Code (NEC), local electrical codes, and manufacturer guidelines.
• Compatibility Verification: Always verify compatibility with your panelboard or load center before installation.
  

Where It Works Best

• The QO390 90 Amp 3-Pole Circuit Breaker is an excellent choice for applications that require dependable circuit protection in compatible electrical systems, including commercial buildings, office facilities, retail spaces, residential installations requiring three-pole protection, light industrial environments, electrical distribution panels and load centers, and equipment operating on 240VAC circuits. Whether you're replacing a worn breaker or upgrading an existing electrical system, the QO390 Type QO Plug-On Circuit Breaker provides the protection and reliability needed to help keep your electrical system operating safely and efficiently.