BR320ST - 20 Amp Circuit Breaker

BR320ST - 20 Amp Circuit Breaker

If you're replacing a shunt trip breaker in an Eaton Type BR panel, the BR320ST is one of the models you'll likely come across. This 20 Amp, 3-pole circuit breaker is built for compatible Eaton Type BR loadcenters and includes a factory-installed shunt trip. It's commonly used in systems where a breaker needs to be opened remotely, whether that's through an emergency stop station, safety circuit, fire alarm interface, or other control device.

The BR320ST combines thermal-magnetic circuit protection with remote tripping capability in a single breaker. It responds to overloads and short circuits like a standard breaker, while the integrated shunt trip allows the breaker to be opened electrically when connected to the appropriate control circuit. The common-trip design means all three poles open together, which is typical for many three-phase applications.

Rated for 240V AC systems, the BR320ST carries a 10 kAIC interrupting rating and accepts #14–4 AWG copper or aluminum conductors. You'll often find this breaker installed on HVAC equipment, pumps, compressors, machinery, process equipment, and control systems where remote shutdown capability is required. For many electricians, selecting this breaker comes down to matching the panel series, amperage rating, pole count, and shunt trip requirement of the existing installation.

Key Features and Benefits

• 20 Amp circuit breaker rating
• Three-pole configuration
• Factory-installed shunt trip
• Thermal-magnetic trip mechanism
• Common-trip operation
• Type BR plug-on design
• Compatible with Eaton Type BR loadcenters
• Rated for 240V AC applications
• 10 kAIC interrupting capacity
• Accepts #14–4 AWG copper or aluminum conductors
• Commonly used where remote breaker operation is required
  

Technical Specifications

• Manufacturer: Eaton
  
• Catalog Number: BR320ST
  
• UPC: 786676003360
  
• Product Type: Thermal Magnetic Circuit Breaker
  
• Series: Type BR
  
• Circuit Breaker Type: BR Shunt Trip
  
• Amperage Rating: 20 Amps
  
• Voltage Rating: 240V AC
  
• Number of Poles: 3
  
• Trip Type: Common Trip
  
• Shunt Trip: Included
  
• Mounting Method: Plug-On
  
• Interrupt Rating: 10 kAIC
  
• Wire Size Compatibility: #14–4 AWG Copper/Aluminum
  
• Used With: 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
• Federal Specifications Classification W-C375
• Manufactured to Eaton Type BR specifications
• Intended for installation in compatible Eaton Type BR loadcenters
  

Where It Works Best

• The Eaton BR320ST is commonly found in commercial buildings, schools, manufacturing facilities, mechanical rooms, and industrial environments where remote breaker operation is needed. You'll often see it connected to emergency stop systems, fire and life safety controls, equipment shutdown circuits, HVAC equipment, pumps, compressors, machinery, and other three-phase loads. It is also frequently used as a direct replacement in existing Eaton Type BR panel installations where a shunt trip breaker is already specified.