B390 - 90Amp Circuit Breaker

B390 - 90Amp Circuit Breaker

The Siemens B390 circuit breaker is designed for commercial and industrial electrical systems that need reliable circuit protection for everyday operation. Rated at 90 amps and built for 240VAC applications, this 3-pole molded case circuit breaker helps protect your electrical equipment and distribution systems from overloads and short circuits that can cause downtime or damage to connected components. Part of the Siemens Type BL series, the B390 features a thermal magnetic trip mechanism that responds to both overload conditions and fault currents. The compact construction also makes installation and replacement work easier, especially in tighter panel layouts. The Siemens B390 is commonly used in commercial buildings, industrial facilities, HVAC systems, manufacturing equipment, and three-phase electrical distribution systems where dependable branch circuit protection is important.

Key Features and Benefits

• 90 amp molded case circuit breaker: Built for dependable protection in commercial and industrial electrical systems.
• 3-pole configuration for three-phase systems: Designed for three-phase electrical distribution applications.
• 240VAC voltage rating: Suitable for low-voltage electrical systems.
• Thermal magnetic trip protection: Responds to overload conditions and fault currents.
• 10kA interrupting capacity: Helps protect against fault-current conditions.
• Siemens Type BL design: Built for reliable everyday operation.
• Bolt-on mounting connection: Provides a secure fit in compatible panelboards and switchboards.
• Compact breaker construction: Helps simplify installation and replacement work.
• Designed for commercial and industrial applications: Suitable for a variety of electrical distribution systems.
• Helps protect against overloads and short circuits: Supports dependable circuit protection performance.
• UL 489 listed: Manufactured to meet low-voltage electrical distribution standards.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: B390
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Type BL
  
• Amperage Rating: 90 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 240VAC
  
• Interrupt Rating: 10kAIC
  
• Trip Type: Thermal Magnetic
  
• Mounting Type: Bolt-On
  
• Connection Type: Bolt-On
  
• Application: Electrical Distribution
  
• Standard: UL 489
  
• Dimensions:
  • Depth: 13 in.
  • Height: 3.7 in.
  • Width: 5 in.
• Net Weight: 0.948 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 Standards: The Siemens B390 circuit breaker is manufactured to meet UL 489 standards for low-voltage electrical distribution systems.
  

Where It Works Best

• Commercial buildings
• Industrial facilities
• HVAC systems
• Manufacturing equipment
• Three-phase electrical systems
• Panelboards and switchboards
• Electrical distribution panels
• Branch circuit protection
• Retrofit and replacement projects