BQD345 - 45Amp Circuit Breaker

BQD345 - 45Amp Circuit Breaker

The Siemens BQD345 is a 45-amp, 3-pole circuit breaker designed for use in 480/277VAC three-phase electrical systems. You'll often find this breaker installed in commercial buildings, industrial facilities, schools, warehouses, and other properties where dependable circuit protection is a necessity. Whether it's feeding HVAC equipment, lighting panels, pumps, or other electrical loads, the BQD345 helps protect circuits from overloads and short circuits before they become bigger problems.

One reason electricians continue to rely on the Siemens BQD series is its straightforward design. The thermal magnetic trip unit provides protection against both gradual overload conditions and sudden fault currents, helping keep equipment and wiring protected. The panelboard-mount configuration and low-tab connections also make this breaker a familiar choice for service work, panel upgrades, and replacement projects. It's built to do exactly what a circuit breaker should do—protect the system and keep things running safely.

If you're maintaining a commercial facility or replacing an existing BQD-series breaker, the Siemens BQD345 offers the specifications and performance needed for many everyday power distribution applications.

Key Features and Benefits

• 45 Amp current rating
• 3-pole design for three-phase systems
• Rated for 480/277VAC applications
• Thermal magnetic trip mechanism
• 14 kAIC interrupting capacity
• Panelboard-mount construction
• Low-tab electrical connections
• Molded case circuit breaker design
• Suitable for commercial and industrial power distribution
• Compact size for efficient use of panel space

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: BQD345
  
• Series: BQD
  
• Current Rating: 45 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 480/277VAC
  
• Interrupting Capacity: 14 kAIC
  
• Frequency: 50/60 Hz
  
• Trip Type: Thermal Magnetic
  
• Mounting Style: Panelboard Mount
  
• Connection Type: Low Tab
  
• Frame Size: 100A
  
• Breaker Type: Molded Case Circuit Breaker
  
• Dimensions:
  • 3 in. W × 3 in. H × 4 in. D
• Maximum Ambient Operating Temperature: 40°C
  
• Net Weight: 1.649 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 Listed
  
• CSA C22.2 Certified
  
• RoHS Compliant
  
• WEEE Take-Back Obligations Applicable
  
• REACH Information Available
  

Where It Works Best

• The Siemens BQD345 is commonly used in panelboards serving lighting systems, HVAC equipment, pumps, motor circuits, and general electrical distribution.