QOB390 - 90A Circuit Breaker

QOB390 - 90A Circuit Breaker

The QOB390 is a 90 amp, 3-pole bolt-on circuit breaker used in compatible Type QOB electrical panelboards. It is rated for 240VAC with a 10kA interrupting capacity, making it suitable for protecting branch circuits from overloads and short circuits within its rated capacity.

Its bolt-on mounting design provides a secure attachment to the panelboard, which is why this style is commonly found in commercial and industrial electrical systems. If you're replacing an existing QOB390 or servicing compatible equipment, matching the breaker's amp rating, pole configuration, voltage rating, and mounting style helps maintain proper system compatibility. The compact housing also allows it to fit the panel space intended for this breaker type.

Key Features and Benefits

• 90 Amp Current Rating: 90 amp current rating.
• Three-Pole Design: Three-pole design for three-phase circuits.
• Bolt-On Mounting: Bolt-on mounting for a secure installation.
• Interrupting Rating: 10kA interrupting rating at 240VAC.
• Type QOB Compatibility: Compatible with designated Type QOB panelboards.
• Replacement Applications: Suitable for replacement and maintenance applications.
  

Technical Specifications

• Part Number: QOB390
  
• Circuit Breaker Type: QOB
  
• Mounting Style: Bolt-On
  
• Poles: 3
  
• Current Rating: 90 Amps
  
• Voltage Rating: 240VAC
  
• Interrupting Rating: 10kA
  
• Dimensions:
  • Height: 3.5 in.
  • Width: 2.25 in.
  • Depth: 2.5 in.

Material Compliance and Certifications

• Circuit Breaker Construction: Molded case circuit breaker.
• Equipment Compatibility: Designed for installation in compatible equipment that accepts Type QOB bolt-on breakers.
• Installation Guidance: Install according to the manufacturer's instructions and applicable electrical codes.
  

Where It Works Best

• The QOB390 is commonly installed in commercial buildings, manufacturing facilities, schools, office buildings, and other locations that use three-phase electrical distribution. It is often selected when replacing an existing breaker with the same ratings or maintaining compatible panelboards already in service.