CQD320 - 20Amp Circuit Breaker

CQD320 - 20Amp Circuit Breaker

The Siemens CQD320 is a 3-pole, 20 amp circuit breaker designed for 480/277V systems, most often found in Siemens CQD panelboard installations. It’s the kind of component that shows up when you’re working inside an existing setup and need a straightforward, like-for-like replacement that keeps everything aligned with the original panel design.

In everyday applications, this breaker is typically used in commercial lighting circuits, small three-phase loads, and general branch circuit protection. The 20A rating fits lighter electrical loads, while the 14kA interrupt rating provides standard protection for faults in this voltage range. It’s a dependable fit for maintenance work where consistency matters more than redesigning or upgrading the system.

Because it mounts on DIN rail, installation stays clean and efficient. It locks into place easily, keeps panel layouts organized, and helps make future servicing a lot more manageable—especially in systems that see ongoing maintenance.

Key Features and Benefits

• Siemens CQD series breaker designed for existing panel systems
• 20 amp, 3-pole configuration for 480/277V applications
• 14kA interrupt rating for standard commercial protection
• DIN rail mounting for quick, clean installation
• Commonly used in lighting and small-load three-phase circuits
• Ideal for like-for-like replacement in CQD panels
• Helps maintain consistency in installed electrical systems
• Compact design supports neat, organized panel layouts
• Makes maintenance and future breaker swaps easier

Technical Specifications

• Model: CQD320
• Series: Siemens CQD
• Amperage: 20A
• Poles: 3
• Voltage Rating: 480/277V AC
• Interrupt Rating: 14kAIC
• Mounting Type: DIN rail
• Application: Three-phase branch circuit protection

Material Compliance and Certifications

Manufactured in accordance with applicable UL and IEC standards for molded case circuit breakers used in commercial electrical systems. Installation should be carried out by qualified personnel in compliance with local electrical codes and safety requirements.

Where It Works Best

• Existing Siemens CQD panelboard systems
• Commercial lighting and low-load distribution circuits
• 480V three-phase branch circuits
• 277V lighting control systems
• Electrical maintenance and replacement work
• Industrial and commercial control panels
• DIN rail panel layouts where organization matters
• Like-for-like CQD series breaker replacement jobs