B390HH - 90Amp Circuit Breaker

B390HH - 90Amp Circuit Breaker

The Siemens B390HH circuit breaker is a solid fit for commercial and industrial electrical systems where higher fault-current protection is important. Rated at 90 amps and designed 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 interrupt operation or damage connected components. Built as part of the Siemens HBL series, the B390HH uses a thermal magnetic trip mechanism that reacts to both overload conditions and sudden fault currents. Its 65kA interrupting capacity makes it well suited for applications where extra fault protection is required. The bolt-on mounting design provides a secure connection in compatible panelboards and switchboards, while the compact size helps make installation and replacement work more manageable.

Key Features and Benefits

• 90 amp molded case circuit breaker: Designed for dependable circuit protection in commercial and industrial applications.
• 3-pole design for three-phase systems: Built for three-phase electrical distribution applications.
• 240VAC voltage rating: Suitable for low-voltage electrical systems.
• 65kA interrupting capacity: Provides additional fault-current protection where required.
• Thermal magnetic trip protection: Responds to both overload conditions and sudden fault currents.
• Siemens HBL series construction: Built for dependable commercial and industrial performance.
• Bolt-on mounting connection: Provides a secure fit in compatible panelboards and switchboards.
• Compact breaker design: Helps simplify installation and replacement work.
• Designed for commercial and industrial applications: Supports dependable electrical distribution 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: B390HH
  
• Product Type: Molded Case Circuit Breaker
  
• Series: HBL
  
• Amperage Rating: 90 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 240VAC
  
• Interrupt Rating: 65kAIC
  
• Trip Type: Thermal Magnetic
  
• Mounting Type: Bolt-On
  
• Connection Type: Bolt-On
  
• Application: Electrical Distribution
  
• Standard: UL 489
  
• Dimensions:
  • Depth: 4 in.
  • Height: 3 in.
  • Width: 4 in.
• Net Weight: 0.948 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 Standards: The Siemens B390HH circuit breaker is manufactured to meet UL 489 standards for low-voltage electrical distribution systems used in commercial and industrial applications.
  

Where It Works Best

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