B345 - 45Amp Circuit Breaker

B345 - 45Amp Circuit Breaker

The Siemens B345 circuit breaker is designed for three-phase electrical systems in commercial and industrial applications. Rated at 45 amps and 240VAC, this molded case circuit breaker helps protect circuits and equipment from overloads and short circuits that can damage electrical systems or cause downtime. Its thermal magnetic trip mechanism responds to both overload conditions and fault currents, while the bolt-on mounting style provides a secure connection in compatible panelboards and distribution equipment. The compact design also helps save space inside electrical panels.

Key Features and Benefits

• 45 amp molded case circuit breaker: Designed for commercial and industrial electrical systems.
• 3-pole design for three-phase systems: Suitable for three-phase electrical distribution applications.
• 240VAC voltage rating: Built for low-voltage electrical distribution systems.
• Thermal magnetic trip protection: Helps protect against overloads and short circuits.
• 10kA interrupting capacity: Provides dependable fault protection for electrical systems.
• Bolt-on mounting style: Provides a secure connection in compatible panelboards and distribution equipment.
• Compact panel-friendly design: Helps save space inside electrical panels.
• Suitable for commercial and industrial applications: Designed for dependable everyday electrical protection.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: B345
  
• Product Type: Molded Case Circuit Breaker
  
• Series: BL
  
• Amperage Rating: 45 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 240VAC
  
• Interrupt Rating: 10kAIC
  
• Trip Type: Thermal Magnetic
  
• Mounting Type: Bolt-On
  
• Application: Electrical Distribution
  
• Standard: UL 489
  
• Dimensions:
  • 2.563 in.
  • 3.00 in.
  • 3.122 in.
• Net Weight: 0.948 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 Standards: The Siemens B345 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
• Panelboards and switchboards
• Control panels
• Manufacturing equipment
• Motor control applications