Q1B390 - 90 Amp Circuit Breaker

Q1B390 - 90 Amp Circuit Breaker

When you're replacing a breaker in existing equipment, the small details matter. The Q1B390 is a 90-amp, 3-pole thermal-magnetic circuit breaker with a bolt-on connection, made for compatible equipment that uses the Q1B breaker type. It is rated 10 kA I.C. at 240 VAC and requires six spaces. The breaker measures 6.38 inches high, 2.25 inches wide, and 2.31 inches deep. Those dimensions, along with the mounting style and electrical ratings, are worth checking carefully when matching a breaker to an existing panel or distribution system. For maintenance work on legacy equipment, the Q1B390 can provide the form, fit, and function needed when these specifications match the original application. It's built to last and, more importantly, designed to do the job it was made for without adding unnecessary complexity to an existing system.

Key Features and Benefits

• 90-amp rating for applications designed around this specific current rating.
• Three-pole design for compatible three-pole electrical circuits.
• Thermal-magnetic operation provides overload and overcurrent protection within the breaker's intended application.
• Rated 10k A.I.C. at 240VAC.
• Bolt-on mounting provides the connection style required by compatible equipment.
• Q1B configuration makes it suitable for equipment designed to accept this breaker type.
• Requires six spaces, an important point to check when confirming fit.
• Clearly defined dimensions make it easier to compare against an existing breaker or equipment requirements.
• A practical choice for legacy electrical equipment where maintaining the correct form, fit, and function is the priority.

Technical Specifications

• Part Number: Q1B390
  
• Type: Q1B
  
• Breaker Type: Bolt-On Thermal Magnetic Circuit Breaker
  
• Amperage: 90 Amps
  
• Poles: 3
  
• A.I.C. Rating & Voltage: 10k @ 240VAC
  
• Mounting Style: Bolt-On
  
• Height: 6.38 in.
  
• Width: 2.25 in.
  
• Depth: 2.31 in.
  
• Spaces Required: 6
  

Material Compliance and Certifications

• Specific material compliance information, agency certifications, and environmental certifications are not included in the available product specifications. Applicable markings or certification documentation should be checked on the individual breaker and against the requirements of the equipment in which it will be installed.
  
  As with any circuit breaker replacement, compatibility should be confirmed before installation. Equipment requirements and electrical codes can vary, so a qualified electrical professional should determine installation and final suitability.

Where It Works Best

• The Q1B390 90-amp 3-pole breaker is a good fit for maintenance and replacement work involving compatible legacy electrical panels and distribution equipment that use Type Q1B bolt-on circuit breakers. This is especially useful when the objective is to keep an existing electrical system in service while maintaining the required breaker configuration.