BR390ST - 90 Amp Circuit Breaker

BR390ST - 90 Amp Circuit Breaker

The Eaton BR390ST is a 90 Amp, three-pole thermal magnetic circuit breaker with an integrated shunt trip, designed for use in compatible Eaton Type BR loadcenters. In addition to providing protection against overloads and short circuits, the shunt trip allows the breaker to be opened remotely when connected to an appropriate control circuit. This makes it a practical choice for installations where power may need to be disconnected as part of a safety system or emergency shutdown procedure.

Because all three poles trip together, the BR390ST is commonly used in three-phase electrical systems where coordinated disconnecting is important. The breaker is often found protecting HVAC equipment, motors, pumps, compressors, distribution panels, and other larger electrical loads in commercial and industrial environments.

The plug-on design allows the breaker to install directly into compatible Eaton BR loadcenters, making it a straightforward option for maintenance work, panel upgrades, and replacement projects.

You'll find the BR390ST in manufacturing facilities, warehouses, schools, healthcare buildings, commercial properties, and a variety of industrial settings. For projects that require both overcurrent protection and remote tripping capability, it provides a simple way to maintain compatibility with existing Eaton Type BR equipment while adding an extra level of control.

Key Features and Benefits

• 90 Amp current rating for higher-capacity electrical applications
• Three-pole configuration designed for three-phase power systems
• Integrated shunt trip feature enables remote breaker operation and emergency shutdown capability
• Common-trip mechanism disconnects all poles simultaneously during fault conditions
• Thermal-magnetic protection against overloads and short circuits
• Compatible with Eaton Type BR loadcenters and panelboards
• Plug-on mounting design for efficient installation and replacement
• 10 kAIC interrupting rating for reliable fault-current protection
• Accepts #4–1/0 AWG copper or aluminum conductors
• Ideal for applications requiring remote disconnect, emergency stop, or safety system integration
• Suitable for HVAC equipment, motors, pumps, compressors, and distribution circuits
  

Technical Specifications

• Manufacturer: Eaton
  
• Catalog Number: BR390ST
  
• UPC: 786676003476
  
• Product Type: Thermal Magnetic Circuit Breaker with Shunt Trip
  
• Series: Type BR
  
• Circuit Breaker Type: BR
  
• Amperage Rating: 90A
  
• Voltage Rating: 240V
  
• Number of Poles: 3
  
• Trip Type: Common Trip
  
• Shunt Trip: Included
  
• Interrupt Rating: 10 kAIC
  
• Mounting Method: Plug-On
  
• Wire Size Compatibility: #4–1/0 AWG Copper/Aluminum
  
• Used With: Eaton Type BR Loadcenters
  
• Dimensions:
  • Depth: 3 in.
  • Width: 3 in.
  • Height: 3 in.
• Weight: 1.3 lb
  
• Warranty: Limited Lifetime Residential, 1 Year Commercial
  

Material Compliance and Certifications

• UL 489 Listed
• Complies with Federal Specifications Classification W-C375
• Manufactured to meet applicable industry safety and performance requirements
• Designed for installation in compatible Eaton Type BR loadcenters and panelboards
• Intended for use in accordance with applicable electrical codes and installation standards
  

Where It Works Best

• The BR390ST is commonly installed anywhere remote breaker operation is part of the system design. Typical applications include fire alarm interface circuits, emergency power-off systems, access control equipment, safety shutdown systems, and other installations where a breaker may need to be tripped from a remote location. Its 90 Amp rating also makes it well suited for protecting larger three-phase loads such as HVAC equipment, pumps, compressors, motor control equipment, and distribution panels.