BR2125ST - 125 Amp Circuit Breaker

BR2125ST - 125 Amp Circuit Breaker

The Eaton BR2125ST is a two-pole, 125 Amp thermal magnetic circuit breaker designed for you to use in compatible Eaton Type BR loadcenters. In addition to standard overcurrent protection, it includes a factory-installed shunt trip that allows the breaker to be opened remotely through an external control signal. This type of breaker is commonly used in electrical systems where power must be disconnected from a remote location, such as emergency shutdown systems, fire and life-safety controls, equipment protection systems, and building automation applications.

The breaker features a common-trip design, which means both poles disconnect together if a fault occurs. Its thermal-magnetic trip mechanism responds to overloads and short circuits, while the shunt trip adds the ability to open the breaker independently of an overcurrent condition when activated by an external device. The plug-on mounting design allows the BR2125ST to install directly into approved Eaton Type BR loadcenters without changing the existing panel configuration.

It is also commonly selected during panel upgrades, maintenance projects, and replacement work involving existing Eaton BR equipment.

Key Features and Benefits

• 125 Amp circuit breaker
• Two-pole configuration
• Factory-installed shunt trip
• Common-trip operation
• Type BR plug-on mounting
• Compatible with Eaton Type BR loadcenters
• Thermal-magnetic trip mechanism
• Rated for 120/240V AC applications
• 10 kAIC interrupting capacity
• Accepts #4–2/0 AWG copper or aluminum conductors
• Designed for remote trip and emergency shutdown applications
  

Technical Specifications

• Manufacturer: Eaton
  
• Catalog Number: BR2125ST
  
• UPC: 786676000420
  
• Product Type: Thermal Magnetic Circuit Breaker
  
• Series: Type BR
  
• Amperage Rating: 125A
  
• Voltage Rating: 120/240V AC
  
• Number of Poles: 2
  
• Trip Type: Common Trip
  
• Shunt Trip: Included
  
• Circuit Breaker Type: BR
  
• Mounting Method: Plug-On
  
• Interrupt Rating: 10 kAIC
  
• Wire Size Compatibility: #4–2/0 AWG Copper/Aluminum
  
• Dimensions: 3.25 in. D × 3 in. W × 3 in. H
  
• Weight: 1 lb
  

Material Compliance and Certifications

• UL 489 Listed
• Federal Specifications Classification W-C375
• Manufactured to Eaton Type BR specifications
• Intended for use in compatible Eaton Type BR loadcenters
  

Where It Works Best

• The BR2125ST is commonly used in commercial buildings, industrial facilities, schools, healthcare environments, multifamily housing, and other electrical systems that require remote breaker operation. Typical applications include feeder circuits, subpanel feeds, HVAC equipment, machinery disconnects, emergency shutdown systems, fire and life-safety controls, and building automation systems.