QOB390VH - 90A Circuit Breaker

QOB390VH - 90A Circuit Breaker

The QOB390VH is a 90-amp, 3-pole bolt-on thermal magnetic circuit breaker used to protect your three-phase electrical circuits from overloads and short circuits. It installs with a bolt-on connection for a secure fit in compatible panelboards, making it a common choice for commercial and industrial electrical systems where reliable circuit protection is needed.

This breaker has a 22kA interrupting rating at 240VAC, allowing it to be used in applications with higher available fault current. The thermal magnetic trip unit provides two layers of protection—it responds to sustained overloads while also tripping quickly during short-circuit conditions. That combination helps you to reduce the risk of damage to wiring and connected equipment.

Electricians often use this style of breaker when replacing an existing unit during maintenance or when adding protection to compatible electrical distribution equipment. Its compact size also makes it easier to work with in panelboards where space matters.

Key Features and Benefits

• 90-Amp Current Rating: 90-amp current rating.
• Three-Pole Design: Three-pole design for three-phase electrical systems.
• Bolt-On Mounting: Bolt-on mounting provides a secure mechanical connection.
• Thermal Magnetic Protection: Thermal magnetic trip unit protects against overloads and short circuits.
• 22kA Interrupting Capacity: 22kA interrupting capacity at 240VAC.
• Compact Housing: Compact housing for compatible panelboards.
• Commercial and Industrial Use: Suitable for commercial and industrial applications.
  

Technical Specifications

• Part Number: QOB390VH
  
• Type: QOB-VH
  
• Circuit Breaker Type: Bolt-On Thermal Magnetic
  
• Poles: 3
  
• Amperage: 90 Amps
  
• Voltage Rating: 240VAC
  
• Interrupting Rating: 22kA @ 240VAC
  
• Dimensions:
  • Height: 3.5 in.
  • Width: 2.25 in.
  • Depth: 2.5 in.

Material Compliance and Certifications

• Thermal Magnetic Construction: Thermal magnetic molded case circuit breaker.
• Equipment Compatibility: Designed for use in compatible electrical distribution equipment.
• Industry Standards: Manufactured to applicable industry standards for molded case circuit breakers.
• Installation Guidance: Always confirm compatibility with your equipment and follow local electrical codes during installation.
  

Where It Works Best

• The QOB390VH is commonly found in commercial buildings, manufacturing facilities, schools, office buildings, warehouses, and similar properties with three-phase electrical service. It can be used to protect feeders, lighting panels, HVAC equipment, motors, and other branch circuits that require a 90-amp, three-pole circuit breaker.