CQD340 - 40Amp Circuit Breaker

CQD340 - 40Amp Circuit Breaker

The Siemens CQD340 is a 3-pole, 40 amp molded case circuit breaker designed for 480/277V Siemens CQD panelboard systems. It’s commonly used in situations where you’re maintaining an existing electrical setup and need a breaker that matches the original configuration for a clean, like-for-like replacement. In many commercial environments, that kind of compatibility is what keeps downtime low and systems running as expected.

In day-to-day applications, this breaker is often found in commercial lighting systems, branch circuits, and three-phase distribution panels. The 40A rating supports moderate electrical loads, while the 14kA interrupt rating provides standard protection for this class of equipment. It’s a practical fit for facilities working within established Siemens CQD infrastructure where consistency across components matters.

Because it mounts on DIN rail, installation stays straightforward and the panel layout remains organized. Once in place, it integrates cleanly into existing systems and supports easier servicing later on when maintenance or replacement is needed.

Key Features and Benefits

• Siemens CQD series breaker for compatible panelboard systems
• 40 amp, 3-pole configuration for 480/277V applications
• 14kA interrupt rating for standard commercial protection
• DIN rail mounting for fast, clean installation
• Commonly used in lighting and three-phase distribution circuits
• Designed for like-for-like replacement in CQD systems
• Helps maintain consistency in existing electrical panels
• Compact design supports organized panel layouts
• Makes maintenance and future replacements easier

Technical Specifications

• Model: CQD340
• Series: Siemens CQD
• Amperage: 40A
• 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 completed by qualified personnel in compliance with local electrical codes and safety requirements.

Where It Works Best

• Existing Siemens CQD panelboard systems
• Commercial lighting and branch circuit distribution
• 480V three-phase electrical systems
• 277V lighting control applications
• Facility maintenance and breaker replacement work
• Industrial and commercial control panels
• DIN rail panel layouts where organization matters
• Like-for-like CQD series replacements in installed systems