Q1-390 - 90 Amp Circuit Breaker

Q1-390 - 90 Amp Circuit Breaker

When you’re replacing a circuit breaker in an existing electrical system, the small details matter just as much as the amp rating. The Q1-390 is a 90-amp, 3-pole Type Q1 plug-on thermal-magnetic circuit breaker rated at 10 kAIC at 240 VAC. It measures 6.38 inches high, 2.25 inches wide, and 2.31 inches deep and requires 6 spaces in compatible equipment. That combination of size, connection style, pole configuration, and electrical ratings makes the Q1-390 particularly useful for maintenance and replacement work where the original equipment calls for this specific breaker. Its thermal-magnetic trip design provides overcurrent protection for its intended application, while the plug-on configuration is made to fit equipment designed for Type Q1 breakers. If you’re trying to keep an existing electrical system in service, matching the breaker’s form, fit, and function is essential. Check the Q1-390 part number and all electrical and dimensional specifications against the breaker being replaced before installation. When properly matched to the application, this is a straightforward circuit protection component built to last.

Key Features and Benefits

• 90-amp rating for applications designed around this specific current rating.
• Three-pole configuration for equipment requiring a 3-pole circuit breaker.
• Thermal-magnetic trip design provides overcurrent protection within the breaker’s intended application.
• Rated 10 kAIC at 240VAC.
• Type Q1 plug-on configuration for use with compatible electrical equipment.
• Requires six spaces, an important point to check before determining fit.
• Useful for legacy electrical equipment where maintaining the original breaker type and electrical characteristics is important.
• Designed with the form, fit, and function needed for compatible Q1 applications.
• Built to last when correctly installed, maintained, and operated within its specified ratings.

Technical Specifications

• Part Number: Q1-390
• Type: Q1
• Breaker Type: Plug-On Thermal Magnetic Circuit Breaker
• Amperage: 90 Amps
• Poles: 3
• AIC Rating: 10k
• Voltage: 240VAC
• AIC Rating & Voltage: 10k @ 240VAC
• Dimensions:
  • Height: 6.38 in.
  • Width: 2.25 in.
  • Depth: 2.31 in.
• Spaces Required: 6

Material Compliance and Certifications

• Specific certification, listing, and material-compliance information was not provided with the available specifications for the Q1-390. For that reason, no additional certifications or compliance claims should be assumed.
• If your application has specific certification or material requirements, check the markings and documentation for the individual breaker before installation. Local codes and the requirements of the equipment in which the breaker will be used should also be considered.

Where It Works Best

• The Q1-390 circuit breaker makes the most sense for existing and legacy electrical systems designed to use a Type Q1 plug-on breaker with these particular ratings and dimensions. It can be suitable for maintenance and replacement work where the application requires 90 amps, three poles, 10k AIC at 240VAC, and a six-space configuration.
• One thing worth remembering: matching a replacement breaker involves more than finding the same amperage. The breaker type, number of poles, voltage, interrupting rating, connection style, physical dimensions, and available space all need to align with the equipment.
• For the Q1-390, verify the Type Q1 configuration, 90A rating, 3-pole design, 10k AIC at 240VAC rating, plug-on connection, six-space requirement, and physical dimensions before use. Final compatibility and installation should be confirmed by qualified electrical personnel and comply with applicable electrical codes and equipment requirements.