Siemens CQD345 - 45 A, 480 V, 3-Pole Circuit Breaker | AmpState

Siemens CQD345 is a 45A, 480V, 3-pole molded case circuit breaker designed to protect branch circuits in panelboards and load centers with reliability and space efficiency. Its compact footprint helps maximize panel fill while delivering dependable overcurrent protection for today’s distributed electrical systems.

Why this breaker stands out

• Compact molded-case design minimizes panel-space usage, making it ideal for crowded panels and retrofit installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection against overloads and short circuits, reducing nuisance trips and safeguarding connected equipment.
• Seamless compatibility with matching OEM loadcenters and panelboards, supporting clean, coordinated protection schemes and straightforward replacement.
• Versatile applications suitable for residential, commercial, and light industrial environments, covering a wide range of distribution needs.

Technical specifications

• Manufacturer: Siemens
• Part Number: CQD345
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45 A
• Voltage Rating: 480 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Protecting three-phase distribution in commercial or light industrial panelboards and load centers that operate at 480V
• Retrofit installations where a compact, reliable 3-pole breaker is required to maintain coordinated protection
• Residential, commercial, or light industrial setups needing robust branch-circuit protection without expanding panel depth

Installation and practical considerations

• Designed to fit Siemens OEM panelboards and compatible load centers for straightforward installation and labeling
• Provides balanced three-phase protection, ensuring each phase receives consistent disconnection behavior during faults
• Ideal as a replacement in compatible panels to preserve UL listing and protective coordination

For reliable 3-phase protection in a compact package, the Siemens CQD345 delivers precise, dependable performance at 45 A and 480 V, making it a practical choice for safeguarding circuits in modern panelboards and load centers.