B345H - 45Amp Circuit Breaker

B345H - 45Amp Circuit Breaker

The Siemens B345H circuit breaker is designed for commercial and industrial electrical systems that need reliable protection in three-phase applications. Rated at 45 amps and 240VAC, this molded case circuit breaker helps protect your circuits and equipment from overloads and short circuits that can cause downtime or equipment damage. Part of the Siemens BLH series, the B345H uses a thermal magnetic trip mechanism that responds to both overload conditions and fault currents. Its 22kA interrupting rating makes it suitable for applications where higher fault-current protection is required. The bolt-on mounting style provides a secure connection in compatible panelboards and electrical distribution equipment, while the compact design helps save space inside electrical panels. The Siemens B345H is commonly used in HVAC systems, control panels, manufacturing equipment, and general power distribution systems where dependable low-voltage circuit protection is important for daily operation.

Key Features and Benefits

• 45 amp molded case circuit breaker: Designed for commercial and industrial electrical systems.
• 3-pole configuration for three-phase systems: Suitable for three-phase electrical distribution applications.
• 240VAC voltage rating: Built for low-voltage electrical systems.
• 22kA interrupting capacity: Suitable for applications where higher fault-current protection is required.
• Thermal magnetic trip protection: Helps protect against overloads and short circuits.
• Bolt-on mounting style: Provides a secure connection in compatible panelboards and electrical distribution equipment.
• Compact design for panel installations: Helps save space inside electrical panels.
• Helps protect against overloads and short circuits: Supports dependable electrical system operation.
• UL 489 listed: Manufactured to meet recognized low-voltage electrical distribution standards.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: B345H
  
• Product Type: Molded Case Circuit Breaker
  
• Series: BLH
  
• Amperage Rating: 45 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 240VAC
  
• Interrupt Rating: 22kAIC
  
• 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 B345H 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
• Three-phase electrical systems