B390H - 90Amp Circuit Breaker

B390H - 90Amp Circuit Breaker

The Siemens B390H circuit breaker is a practical choice for commercial and industrial electrical systems that need dependable protection in applications with higher available fault current. Rated at 90 amps and designed for 240VAC systems, this 3-pole molded case circuit breaker helps protect your electrical equipment and power distribution systems from overloads and short circuits before they turn into bigger problems.

Built as part of the Siemens BLH series, the B390H uses a thermal magnetic trip mechanism that responds to both overload conditions and sudden fault currents. Its 22kA interrupting capacity makes it a solid fit for systems where additional fault protection is important. The bolt-on mounting design provides a secure connection in compatible panelboards and switchboards, while the compact size helps you make installation and replacement work more manageable in crowded electrical panels.

Key Features and Benefits

• 90 amp molded case circuit breaker: Designed for dependable protection in commercial and industrial electrical systems.
• 3-pole design for three-phase systems: Built for three-phase electrical distribution applications.
• 240VAC voltage rating: Suitable for low-voltage electrical systems.
• 22kA interrupting capacity: Provides additional fault-current protection where needed.
• Thermal magnetic trip protection: Responds to both overload conditions and sudden fault currents.
• Siemens BLH series construction: Built for reliable commercial and industrial operation.
• Bolt-on mounting connection: Provides a secure fit in compatible panelboards and switchboards.
• Compact breaker design: Helps simplify installation and replacement work in crowded electrical panels.
• Designed for commercial and industrial applications: Supports dependable branch circuit protection.
• Helps protect against overloads and short circuits: Supports safer system operation.
• UL 489 listed: Manufactured to meet low-voltage electrical distribution standards.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: B390H
  
• Product Type: Molded Case Circuit Breaker
  
• Series: BLH
  
• Amperage Rating: 90 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 240VAC
  
• Interrupt Rating: 22kAIC
  
• Trip Type: Thermal Magnetic
  
• Mounting Type: Bolt-On
  
• Connection Type: Bolt-On
  
• Application: Electrical Distribution
  
• Standard: UL 489
  
• Dimensions:
  • Depth: 3 in.
  • Height: 4 in.
  • Width: 3 in.
• Net Weight: 0.948 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 Standards: The Siemens B390H circuit breaker is manufactured to meet UL 489 standards for low-voltage electrical distribution systems used in commercial and industrial environments.
  

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